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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/hyper-0.14.26/src/proto/h1/io.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>io.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../hyper/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../hyper/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="kw">use </span>std::cmp;
 <span class="kw">use </span>std::fmt;
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
 </span><span class="kw">use </span>std::future::Future;
 <span class="kw">use </span>std::io::{<span class="self">self</span>, IoSlice};
 <span class="kw">use </span>std::marker::Unpin;
 <span class="kw">use </span>std::mem::MaybeUninit;
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
 </span><span class="kw">use </span>std::time::Duration;

 <span class="kw">use </span>bytes::{Buf, BufMut, Bytes, BytesMut};
 <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
 </span><span class="kw">use </span>tokio::time::Instant;
 <span class="kw">use </span>tracing::{debug, trace};

 <span class="kw">use super</span>::{Http1Transaction, ParseContext, ParsedMessage};
 <span class="kw">use </span><span class="kw">crate</span>::common::buf::BufList;
 <span class="kw">use </span><span class="kw">crate</span>::common::{task, Pin, Poll};

 <span class="doccomment">/// The initial buffer size allocated before trying to read from IO.
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>INIT_BUFFER_SIZE: usize = <span class="number">8192</span>;

 <span class="doccomment">/// The minimum value that can be set to max buffer size.
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>MINIMUM_MAX_BUFFER_SIZE: usize = INIT_BUFFER_SIZE;

 <span class="doccomment">/// The default maximum read buffer size. If the buffer gets this big and
 /// a message is still not complete, a `TooLarge` error is triggered.
 </span><span class="comment">// Note: if this changes, update server::conn::Http::max_buf_size docs.
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>DEFAULT_MAX_BUFFER_SIZE: usize = <span class="number">8192 </span>+ <span class="number">4096 </span>* <span class="number">100</span>;

 <span class="doccomment">/// The maximum number of distinct `Buf`s to hold in a list before requiring
 /// a flush. Only affects when the buffer strategy is to queue buffers.
 ///
 /// Note that a flush can happen before reaching the maximum. This simply
 /// forces a flush if the queue gets this big.
 </span><span class="kw">const </span>MAX_BUF_LIST_BUFFERS: usize = <span class="number">16</span>;

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Buffered&lt;T, B&gt; {
     flush_pipeline: bool,
     io: T,
     read_blocked: bool,
     read_buf: BytesMut,
     read_buf_strategy: ReadStrategy,
     write_buf: WriteBuf&lt;B&gt;,
 }

 <span class="kw">impl</span>&lt;T, B&gt; fmt::Debug <span class="kw">for </span>Buffered&lt;T, B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;Buffered&quot;</span>)
             .field(<span class="string">&quot;read_buf&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.read_buf)
             .field(<span class="string">&quot;write_buf&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.write_buf)
             .finish()
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; Buffered&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(io: T) -&gt; Buffered&lt;T, B&gt; {
         <span class="kw">let </span>strategy = <span class="kw">if </span>io.is_write_vectored() {
             WriteStrategy::Queue
         } <span class="kw">else </span>{
             WriteStrategy::Flatten
         };
         <span class="kw">let </span>write_buf = WriteBuf::new(strategy);
         Buffered {
             flush_pipeline: <span class="bool-val">false</span>,
             io,
             read_blocked: <span class="bool-val">false</span>,
             read_buf: BytesMut::with_capacity(<span class="number">0</span>),
             read_buf_strategy: ReadStrategy::default(),
             write_buf,
         }
     }

     <span class="attribute">#[cfg(feature = <span class="string">&quot;server&quot;</span>)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_flush_pipeline(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) {
         <span class="macro">debug_assert!</span>(!<span class="self">self</span>.write_buf.has_remaining());
         <span class="self">self</span>.flush_pipeline = enabled;
         <span class="kw">if </span>enabled {
             <span class="self">self</span>.set_write_strategy_flatten();
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_max_buf_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: usize) {
         <span class="macro">assert!</span>(
             max &gt;= MINIMUM_MAX_BUFFER_SIZE,
             <span class="string">&quot;The max_buf_size cannot be smaller than {}.&quot;</span>,
             MINIMUM_MAX_BUFFER_SIZE,
         );
         <span class="self">self</span>.read_buf_strategy = ReadStrategy::with_max(max);
         <span class="self">self</span>.write_buf.max_buf_size = max;
     }

     <span class="attribute">#[cfg(feature = <span class="string">&quot;client&quot;</span>)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_read_buf_exact_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: usize) {
         <span class="self">self</span>.read_buf_strategy = ReadStrategy::Exact(sz);
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_write_strategy_flatten(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="comment">// this should always be called only at construction time,
         // so this assert is here to catch myself
         </span><span class="macro">debug_assert!</span>(<span class="self">self</span>.write_buf.queue.bufs_cnt() == <span class="number">0</span>);
         <span class="self">self</span>.write_buf.set_strategy(WriteStrategy::Flatten);
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set_write_strategy_queue(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="comment">// this should always be called only at construction time,
         // so this assert is here to catch myself
         </span><span class="macro">debug_assert!</span>(<span class="self">self</span>.write_buf.queue.bufs_cnt() == <span class="number">0</span>);
         <span class="self">self</span>.write_buf.set_strategy(WriteStrategy::Queue);
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>read_buf(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="self">self</span>.read_buf.as_ref()
     }

     <span class="attribute">#[cfg(test)]
     #[cfg(feature = <span class="string">&quot;nightly&quot;</span>)]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>read_buf_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>BytesMut {
         <span class="kw-2">&amp;mut </span><span class="self">self</span>.read_buf
     }

     <span class="doccomment">/// Return the &quot;allocated&quot; available space, not the potential space
     /// that could be allocated in the future.
     </span><span class="kw">fn </span>read_buf_remaining_mut(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.read_buf.capacity() - <span class="self">self</span>.read_buf.len()
     }

     <span class="doccomment">/// Return whether we can append to the headers buffer.
     ///
     /// Reasons we can&#39;t:
     /// - The write buf is in queue mode, and some of the past body is still
     ///   needing to be flushed.
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>can_headers_buf(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         !<span class="self">self</span>.write_buf.queue.has_remaining()
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>headers_buf(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt; {
         <span class="kw">let </span>buf = <span class="self">self</span>.write_buf.headers_mut();
         <span class="kw-2">&amp;mut </span>buf.bytes
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>write_buf(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>WriteBuf&lt;B&gt; {
         <span class="kw-2">&amp;mut </span><span class="self">self</span>.write_buf
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>buffer&lt;BB: Buf + Into&lt;B&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: BB) {
         <span class="self">self</span>.write_buf.buffer(buf)
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>can_buffer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.flush_pipeline || <span class="self">self</span>.write_buf.can_buffer()
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>consume_leading_lines(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">if </span>!<span class="self">self</span>.read_buf.is_empty() {
             <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
             <span class="kw">while </span>i &lt; <span class="self">self</span>.read_buf.len() {
                 <span class="kw">match </span><span class="self">self</span>.read_buf[i] {
                     <span class="string">b&#39;\r&#39; </span>| <span class="string">b&#39;\n&#39; </span>=&gt; i += <span class="number">1</span>,
                     <span class="kw">_ </span>=&gt; <span class="kw">break</span>,
                 }
             }
             <span class="self">self</span>.read_buf.advance(i);
         }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>parse&lt;S&gt;(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;,
         parse_ctx: ParseContext&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Poll&lt;<span class="kw">crate</span>::Result&lt;ParsedMessage&lt;S::Incoming&gt;&gt;&gt;
     <span class="kw">where
         </span>S: Http1Transaction,
     {
         <span class="kw">loop </span>{
             <span class="kw">match </span><span class="kw">super</span>::role::parse_headers::&lt;S&gt;(
                 <span class="kw-2">&amp;mut </span><span class="self">self</span>.read_buf,
                 ParseContext {
                     cached_headers: parse_ctx.cached_headers,
                     req_method: parse_ctx.req_method,
                     h1_parser_config: parse_ctx.h1_parser_config.clone(),
                     <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
                     </span>h1_header_read_timeout: parse_ctx.h1_header_read_timeout,
                     <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
                     </span>h1_header_read_timeout_fut: parse_ctx.h1_header_read_timeout_fut,
                     <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
                     </span>h1_header_read_timeout_running: parse_ctx.h1_header_read_timeout_running,
                     preserve_header_case: parse_ctx.preserve_header_case,
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                     </span>preserve_header_order: parse_ctx.preserve_header_order,
                     h09_responses: parse_ctx.h09_responses,
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                     </span>on_informational: parse_ctx.on_informational,
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                     </span>raw_headers: parse_ctx.raw_headers,
                 },
             )<span class="question-mark">? </span>{
                 <span class="prelude-val">Some</span>(msg) =&gt; {
                     <span class="macro">debug!</span>(<span class="string">&quot;parsed {} headers&quot;</span>, msg.head.headers.len());

                     <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
                     </span>{
                         <span class="kw-2">*</span>parse_ctx.h1_header_read_timeout_running = <span class="bool-val">false</span>;

                         <span class="kw">if let </span><span class="prelude-val">Some</span>(h1_header_read_timeout_fut) =
                             parse_ctx.h1_header_read_timeout_fut
                         {
                             <span class="comment">// Reset the timer in order to avoid woken up when the timeout finishes
                             </span>h1_header_read_timeout_fut
                                 .as_mut()
                                 .reset(Instant::now() + Duration::from_secs(<span class="number">30 </span>* <span class="number">24 </span>* <span class="number">60 </span>* <span class="number">60</span>));
                         }
                     }
                     <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(msg));
                 }
                 <span class="prelude-val">None </span>=&gt; {
                     <span class="kw">let </span>max = <span class="self">self</span>.read_buf_strategy.max();
                     <span class="kw">if </span><span class="self">self</span>.read_buf.len() &gt;= max {
                         <span class="macro">debug!</span>(<span class="string">&quot;max_buf_size ({}) reached, closing&quot;</span>, max);
                         <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(<span class="kw">crate</span>::Error::new_too_large()));
                     }

                     <span class="attribute">#[cfg(all(feature = <span class="string">&quot;server&quot;</span>, feature = <span class="string">&quot;runtime&quot;</span>))]
                     </span><span class="kw">if </span><span class="kw-2">*</span>parse_ctx.h1_header_read_timeout_running {
                         <span class="kw">if let </span><span class="prelude-val">Some</span>(h1_header_read_timeout_fut) =
                             parse_ctx.h1_header_read_timeout_fut
                         {
                             <span class="kw">if </span>Pin::new(h1_header_read_timeout_fut).poll(cx).is_ready() {
                                 <span class="kw-2">*</span>parse_ctx.h1_header_read_timeout_running = <span class="bool-val">false</span>;

                                 <span class="macro">tracing::warn!</span>(<span class="string">&quot;read header from client timeout&quot;</span>);
                                 <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(<span class="kw">crate</span>::Error::new_header_timeout()));
                             }
                         }
                     }
                 }
             }
             <span class="kw">if </span><span class="macro">ready!</span>(<span class="self">self</span>.poll_read_from_io(cx)).map_err(<span class="kw">crate</span>::Error::new_io)<span class="question-mark">? </span>== <span class="number">0 </span>{
                 <span class="macro">trace!</span>(<span class="string">&quot;parse eof&quot;</span>);
                 <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(<span class="kw">crate</span>::Error::new_incomplete()));
             }
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_read_from_io(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Poll&lt;io::Result&lt;usize&gt;&gt; {
         <span class="self">self</span>.read_blocked = <span class="bool-val">false</span>;
         <span class="kw">let </span>next = <span class="self">self</span>.read_buf_strategy.next();
         <span class="kw">if </span><span class="self">self</span>.read_buf_remaining_mut() &lt; next {
             <span class="self">self</span>.read_buf.reserve(next);
         }

         <span class="kw">let </span>dst = <span class="self">self</span>.read_buf.chunk_mut();
         <span class="kw">let </span>dst = <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>(dst <span class="kw">as </span><span class="kw-2">*mut </span><span class="kw">_ as </span><span class="kw-2">*mut </span>[MaybeUninit&lt;u8&gt;]) };
         <span class="kw">let </span><span class="kw-2">mut </span>buf = ReadBuf::uninit(dst);
         <span class="kw">match </span>Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_read(cx, <span class="kw-2">&amp;mut </span>buf) {
             Poll::Ready(<span class="prelude-val">Ok</span>(<span class="kw">_</span>)) =&gt; {
                 <span class="kw">let </span>n = buf.filled().len();
                 <span class="macro">trace!</span>(<span class="string">&quot;received {} bytes&quot;</span>, n);
                 <span class="kw">unsafe </span>{
                     <span class="comment">// Safety: we just read that many bytes into the
                     // uninitialized part of the buffer, so this is okay.
                     // @tokio pls give me back `poll_read_buf` thanks
                     </span><span class="self">self</span>.read_buf.advance_mut(n);
                 }
                 <span class="self">self</span>.read_buf_strategy.record(n);
                 Poll::Ready(<span class="prelude-val">Ok</span>(n))
             }
             Poll::Pending =&gt; {
                 <span class="self">self</span>.read_blocked = <span class="bool-val">true</span>;
                 Poll::Pending
             }
             Poll::Ready(<span class="prelude-val">Err</span>(e)) =&gt; Poll::Ready(<span class="prelude-val">Err</span>(e)),
         }
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>into_inner(<span class="self">self</span>) -&gt; (T, Bytes) {
         (<span class="self">self</span>.io, <span class="self">self</span>.read_buf.freeze())
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>io_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>T {
         <span class="kw-2">&amp;mut </span><span class="self">self</span>.io
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_read_blocked(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.read_blocked
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poll_flush(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
         <span class="kw">if </span><span class="self">self</span>.flush_pipeline &amp;&amp; !<span class="self">self</span>.read_buf.is_empty() {
             Poll::Ready(<span class="prelude-val">Ok</span>(()))
         } <span class="kw">else if </span><span class="self">self</span>.write_buf.remaining() == <span class="number">0 </span>{
             Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_flush(cx)
         } <span class="kw">else </span>{
             <span class="kw">if let </span>WriteStrategy::Flatten = <span class="self">self</span>.write_buf.strategy {
                 <span class="kw">return </span><span class="self">self</span>.poll_flush_flattened(cx);
             }

             <span class="kw">const </span>MAX_WRITEV_BUFS: usize = <span class="number">64</span>;
             <span class="kw">loop </span>{
                 <span class="kw">let </span>n = {
                     <span class="kw">let </span><span class="kw-2">mut </span>iovs = [IoSlice::new(<span class="kw-2">&amp;</span>[]); MAX_WRITEV_BUFS];
                     <span class="kw">let </span>len = <span class="self">self</span>.write_buf.chunks_vectored(<span class="kw-2">&amp;mut </span>iovs);
                     <span class="macro">ready!</span>(Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_write_vectored(cx, <span class="kw-2">&amp;</span>iovs[..len]))<span class="question-mark">?
                 </span>};
                 <span class="comment">// TODO(eliza): we have to do this manually because
                 // `poll_write_buf` doesn&#39;t exist in Tokio 0.3 yet...when
                 // `poll_write_buf` comes back, the manual advance will need to leave!
                 </span><span class="self">self</span>.write_buf.advance(n);
                 <span class="macro">debug!</span>(<span class="string">&quot;flushed {} bytes&quot;</span>, n);
                 <span class="kw">if </span><span class="self">self</span>.write_buf.remaining() == <span class="number">0 </span>{
                     <span class="kw">break</span>;
                 } <span class="kw">else if </span>n == <span class="number">0 </span>{
                     <span class="macro">trace!</span>(
                         <span class="string">&quot;write returned zero, but {} bytes remaining&quot;</span>,
                         <span class="self">self</span>.write_buf.remaining()
                     );
                     <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(io::ErrorKind::WriteZero.into()));
                 }
             }
             Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_flush(cx)
         }
     }

     <span class="doccomment">/// Specialized version of `flush` when strategy is Flatten.
     ///
     /// Since all buffered bytes are flattened into the single headers buffer,
     /// that skips some bookkeeping around using multiple buffers.
     </span><span class="kw">fn </span>poll_flush_flattened(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;io::Result&lt;()&gt;&gt; {
         <span class="kw">loop </span>{
             <span class="kw">let </span>n = <span class="macro">ready!</span>(Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_write(cx, <span class="self">self</span>.write_buf.headers.chunk()))<span class="question-mark">?</span>;
             <span class="macro">debug!</span>(<span class="string">&quot;flushed {} bytes&quot;</span>, n);
             <span class="self">self</span>.write_buf.headers.advance(n);
             <span class="kw">if </span><span class="self">self</span>.write_buf.headers.remaining() == <span class="number">0 </span>{
                 <span class="self">self</span>.write_buf.headers.reset();
                 <span class="kw">break</span>;
             } <span class="kw">else if </span>n == <span class="number">0 </span>{
                 <span class="macro">trace!</span>(
                     <span class="string">&quot;write returned zero, but {} bytes remaining&quot;</span>,
                     <span class="self">self</span>.write_buf.remaining()
                 );
                 <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(io::ErrorKind::WriteZero.into()));
             }
         }
         Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.io).poll_flush(cx)
     }

     <span class="attribute">#[cfg(test)]
     </span><span class="kw">fn </span>flush&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="kw">impl </span>std::future::Future&lt;Output = io::Result&lt;()&gt;&gt; + <span class="lifetime">&#39;a </span>{
         futures_util::future::poll_fn(<span class="kw">move </span>|cx| <span class="self">self</span>.poll_flush(cx))
     }
 }

 <span class="comment">// The `B` is a `Buf`, we never project a pin to it
 </span><span class="kw">impl</span>&lt;T: Unpin, B&gt; Unpin <span class="kw">for </span>Buffered&lt;T, B&gt; {}

 <span class="comment">// TODO: This trait is old... at least rename to PollBytes or something...
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>MemRead {
     <span class="kw">fn </span>read_mem(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;, len: usize) -&gt; Poll&lt;io::Result&lt;Bytes&gt;&gt;;
 }

 <span class="kw">impl</span>&lt;T, B&gt; MemRead <span class="kw">for </span>Buffered&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">fn </span>read_mem(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;, len: usize) -&gt; Poll&lt;io::Result&lt;Bytes&gt;&gt; {
         <span class="kw">if </span>!<span class="self">self</span>.read_buf.is_empty() {
             <span class="kw">let </span>n = std::cmp::min(len, <span class="self">self</span>.read_buf.len());
             Poll::Ready(<span class="prelude-val">Ok</span>(<span class="self">self</span>.read_buf.split_to(n).freeze()))
         } <span class="kw">else </span>{
             <span class="kw">let </span>n = <span class="macro">ready!</span>(<span class="self">self</span>.poll_read_from_io(cx))<span class="question-mark">?</span>;
             Poll::Ready(<span class="prelude-val">Ok</span>(<span class="self">self</span>.read_buf.split_to(::std::cmp::min(len, n)).freeze()))
         }
     }
 }

 <span class="attribute">#[derive(Clone, Copy, Debug)]
 </span><span class="kw">enum </span>ReadStrategy {
     Adaptive {
         decrease_now: bool,
         next: usize,
         max: usize,
     },
     <span class="attribute">#[cfg(feature = <span class="string">&quot;client&quot;</span>)]
     </span>Exact(usize),
 }

 <span class="kw">impl </span>ReadStrategy {
     <span class="kw">fn </span>with_max(max: usize) -&gt; ReadStrategy {
         ReadStrategy::Adaptive {
             decrease_now: <span class="bool-val">false</span>,
             next: INIT_BUFFER_SIZE,
             max,
         }
     }

     <span class="kw">fn </span>next(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             ReadStrategy::Adaptive { next, .. } =&gt; next,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;client&quot;</span>)]
             </span>ReadStrategy::Exact(exact) =&gt; exact,
         }
     }

     <span class="kw">fn </span>max(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             ReadStrategy::Adaptive { max, .. } =&gt; max,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;client&quot;</span>)]
             </span>ReadStrategy::Exact(exact) =&gt; exact,
         }
     }

     <span class="kw">fn </span>record(<span class="kw-2">&amp;mut </span><span class="self">self</span>, bytes_read: usize) {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             ReadStrategy::Adaptive {
                 <span class="kw-2">ref mut </span>decrease_now,
                 <span class="kw-2">ref mut </span>next,
                 max,
                 ..
             } =&gt; {
                 <span class="kw">if </span>bytes_read &gt;= <span class="kw-2">*</span>next {
                     <span class="kw-2">*</span>next = cmp::min(incr_power_of_two(<span class="kw-2">*</span>next), max);
                     <span class="kw-2">*</span>decrease_now = <span class="bool-val">false</span>;
                 } <span class="kw">else </span>{
                     <span class="kw">let </span>decr_to = prev_power_of_two(<span class="kw-2">*</span>next);
                     <span class="kw">if </span>bytes_read &lt; decr_to {
                         <span class="kw">if </span><span class="kw-2">*</span>decrease_now {
                             <span class="kw-2">*</span>next = cmp::max(decr_to, INIT_BUFFER_SIZE);
                             <span class="kw-2">*</span>decrease_now = <span class="bool-val">false</span>;
                         } <span class="kw">else </span>{
                             <span class="comment">// Decreasing is a two &quot;record&quot; process.
                             </span><span class="kw-2">*</span>decrease_now = <span class="bool-val">true</span>;
                         }
                     } <span class="kw">else </span>{
                         <span class="comment">// A read within the current range should cancel
                         // a potential decrease, since we just saw proof
                         // that we still need this size.
                         </span><span class="kw-2">*</span>decrease_now = <span class="bool-val">false</span>;
                     }
                 }
             }
             <span class="attribute">#[cfg(feature = <span class="string">&quot;client&quot;</span>)]
             </span>ReadStrategy::Exact(<span class="kw">_</span>) =&gt; (),
         }
     }
 }

 <span class="kw">fn </span>incr_power_of_two(n: usize) -&gt; usize {
     n.saturating_mul(<span class="number">2</span>)
 }

 <span class="kw">fn </span>prev_power_of_two(n: usize) -&gt; usize {
     <span class="comment">// Only way this shift can underflow is if n is less than 4.
     // (Which would means `usize::MAX &gt;&gt; 64` and underflowed!)
     </span><span class="macro">debug_assert!</span>(n &gt;= <span class="number">4</span>);
     (::std::usize::MAX &gt;&gt; (n.leading_zeros() + <span class="number">2</span>)) + <span class="number">1
 </span>}

 <span class="kw">impl </span>Default <span class="kw">for </span>ReadStrategy {
     <span class="kw">fn </span>default() -&gt; ReadStrategy {
         ReadStrategy::with_max(DEFAULT_MAX_BUFFER_SIZE)
     }
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Cursor&lt;T&gt; {
     bytes: T,
     pos: usize,
 }

 <span class="kw">impl</span>&lt;T: AsRef&lt;[u8]&gt;&gt; Cursor&lt;T&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(bytes: T) -&gt; Cursor&lt;T&gt; {
         Cursor { bytes, pos: <span class="number">0 </span>}
     }
 }

 <span class="kw">impl </span>Cursor&lt;Vec&lt;u8&gt;&gt; {
     <span class="doccomment">/// If we&#39;ve advanced the position a bit in this cursor, and wish to
     /// extend the underlying vector, we may wish to unshift the &quot;read&quot; bytes
     /// off, and move everything else over.
     </span><span class="kw">fn </span>maybe_unshift(<span class="kw-2">&amp;mut </span><span class="self">self</span>, additional: usize) {
         <span class="kw">if </span><span class="self">self</span>.pos == <span class="number">0 </span>{
             <span class="comment">// nothing to do
             </span><span class="kw">return</span>;
         }

         <span class="kw">if </span><span class="self">self</span>.bytes.capacity() - <span class="self">self</span>.bytes.len() &gt;= additional {
             <span class="comment">// there&#39;s room!
             </span><span class="kw">return</span>;
         }

         <span class="self">self</span>.bytes.drain(<span class="number">0</span>..<span class="self">self</span>.pos);
         <span class="self">self</span>.pos = <span class="number">0</span>;
     }

     <span class="kw">fn </span>reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.pos = <span class="number">0</span>;
         <span class="self">self</span>.bytes.clear();
     }
 }

 <span class="kw">impl</span>&lt;T: AsRef&lt;[u8]&gt;&gt; fmt::Debug <span class="kw">for </span>Cursor&lt;T&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;Cursor&quot;</span>)
             .field(<span class="string">&quot;pos&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.pos)
             .field(<span class="string">&quot;len&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.bytes.as_ref().len())
             .finish()
     }
 }

 <span class="kw">impl</span>&lt;T: AsRef&lt;[u8]&gt;&gt; Buf <span class="kw">for </span>Cursor&lt;T&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>remaining(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.bytes.as_ref().len() - <span class="self">self</span>.pos
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>chunk(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="kw-2">&amp;</span><span class="self">self</span>.bytes.as_ref()[<span class="self">self</span>.pos..]
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>advance(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cnt: usize) {
         <span class="macro">debug_assert!</span>(<span class="self">self</span>.pos + cnt &lt;= <span class="self">self</span>.bytes.as_ref().len());
         <span class="self">self</span>.pos += cnt;
     }
 }

 <span class="comment">// an internal buffer to collect writes before flushes
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>WriteBuf&lt;B&gt; {
     <span class="doccomment">/// Re-usable buffer that holds message headers
     </span>headers: Cursor&lt;Vec&lt;u8&gt;&gt;,
     max_buf_size: usize,
     <span class="doccomment">/// Deque of user buffers if strategy is Queue
     </span>queue: BufList&lt;B&gt;,
     strategy: WriteStrategy,
 }

 <span class="kw">impl</span>&lt;B: Buf&gt; WriteBuf&lt;B&gt; {
     <span class="kw">fn </span>new(strategy: WriteStrategy) -&gt; WriteBuf&lt;B&gt; {
         WriteBuf {
             headers: Cursor::new(Vec::with_capacity(INIT_BUFFER_SIZE)),
             max_buf_size: DEFAULT_MAX_BUFFER_SIZE,
             queue: BufList::new(),
             strategy,
         }
     }
 }

 <span class="kw">impl</span>&lt;B&gt; WriteBuf&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="kw">fn </span>set_strategy(<span class="kw-2">&amp;mut </span><span class="self">self</span>, strategy: WriteStrategy) {
         <span class="self">self</span>.strategy = strategy;
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>buffer&lt;BB: Buf + Into&lt;B&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>buf: BB) {
         <span class="macro">debug_assert!</span>(buf.has_remaining());
         <span class="kw">match </span><span class="self">self</span>.strategy {
             WriteStrategy::Flatten =&gt; {
                 <span class="kw">let </span>head = <span class="self">self</span>.headers_mut();

                 head.maybe_unshift(buf.remaining());
                 <span class="macro">trace!</span>(
                     <span class="self">self</span>.len = head.remaining(),
                     buf.len = buf.remaining(),
                     <span class="string">&quot;buffer.flatten&quot;
                 </span>);
                 <span class="comment">//perf: This is a little faster than &lt;Vec as BufMut&gt;&gt;::put,
                 //but accomplishes the same result.
                 </span><span class="kw">loop </span>{
                     <span class="kw">let </span>adv = {
                         <span class="kw">let </span>slice = buf.chunk();
                         <span class="kw">if </span>slice.is_empty() {
                             <span class="kw">return</span>;
                         }
                         head.bytes.extend_from_slice(slice);
                         slice.len()
                     };
                     buf.advance(adv);
                 }
             }
             WriteStrategy::Queue =&gt; {
                 <span class="macro">trace!</span>(
                     <span class="self">self</span>.len = <span class="self">self</span>.remaining(),
                     buf.len = buf.remaining(),
                     <span class="string">&quot;buffer.queue&quot;
                 </span>);
                 <span class="self">self</span>.queue.push(buf.into());
             }
         }
     }

     <span class="kw">fn </span>can_buffer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="kw">match </span><span class="self">self</span>.strategy {
             WriteStrategy::Flatten =&gt; <span class="self">self</span>.remaining() &lt; <span class="self">self</span>.max_buf_size,
             WriteStrategy::Queue =&gt; {
                 <span class="self">self</span>.queue.bufs_cnt() &lt; MAX_BUF_LIST_BUFFERS &amp;&amp; <span class="self">self</span>.remaining() &lt; <span class="self">self</span>.max_buf_size
             }
         }
     }

     <span class="kw">fn </span>headers_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Cursor&lt;Vec&lt;u8&gt;&gt; {
         <span class="macro">debug_assert!</span>(!<span class="self">self</span>.queue.has_remaining());
         <span class="kw-2">&amp;mut </span><span class="self">self</span>.headers
     }
 }

 <span class="kw">impl</span>&lt;B: Buf&gt; fmt::Debug <span class="kw">for </span>WriteBuf&lt;B&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;WriteBuf&quot;</span>)
             .field(<span class="string">&quot;remaining&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.remaining())
             .field(<span class="string">&quot;strategy&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.strategy)
             .finish()
     }
 }

 <span class="kw">impl</span>&lt;B: Buf&gt; Buf <span class="kw">for </span>WriteBuf&lt;B&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>remaining(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.headers.remaining() + <span class="self">self</span>.queue.remaining()
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>chunk(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="kw">let </span>headers = <span class="self">self</span>.headers.chunk();
         <span class="kw">if </span>!headers.is_empty() {
             headers
         } <span class="kw">else </span>{
             <span class="self">self</span>.queue.chunk()
         }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>advance(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cnt: usize) {
         <span class="kw">let </span>hrem = <span class="self">self</span>.headers.remaining();

         <span class="kw">match </span>hrem.cmp(<span class="kw-2">&amp;</span>cnt) {
             cmp::Ordering::Equal =&gt; <span class="self">self</span>.headers.reset(),
             cmp::Ordering::Greater =&gt; <span class="self">self</span>.headers.advance(cnt),
             cmp::Ordering::Less =&gt; {
                 <span class="kw">let </span>qcnt = cnt - hrem;
                 <span class="self">self</span>.headers.reset();
                 <span class="self">self</span>.queue.advance(qcnt);
             }
         }
     }

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>chunks_vectored&lt;<span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span><span class="self">self</span>, dst: <span class="kw-2">&amp;mut </span>[IoSlice&lt;<span class="lifetime">&#39;t</span>&gt;]) -&gt; usize {
         <span class="kw">let </span>n = <span class="self">self</span>.headers.chunks_vectored(dst);
         <span class="self">self</span>.queue.chunks_vectored(<span class="kw-2">&amp;mut </span>dst[n..]) + n
     }
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">enum </span>WriteStrategy {
     Flatten,
     Queue,
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;
     <span class="kw">use </span>std::time::Duration;

     <span class="kw">use </span>tokio_test::io::Builder <span class="kw">as </span>Mock;

     <span class="comment">// #[cfg(feature = &quot;nightly&quot;)]
     // use test::Bencher;

     /*
     impl&lt;T: Read&gt; MemRead for AsyncIo&lt;T&gt; {
         fn read_mem(&amp;mut self, len: usize) -&gt; Poll&lt;Bytes, io::Error&gt; {
             let mut v = vec![0; len];
             let n = try_nb!(self.read(v.as_mut_slice()));
             Ok(Async::Ready(BytesMut::from(&amp;v[..n]).freeze()))
         }
     }
     */

     </span><span class="attribute">#[tokio::test]
     #[ignore]
     </span><span class="kw">async fn </span>iobuf_write_empty_slice() {
         <span class="comment">// TODO(eliza): can i have writev back pls T_T
         // // First, let&#39;s just check that the Mock would normally return an
         // // error on an unexpected write, even if the buffer is empty...
         // let mut mock = Mock::new().build();
         // futures_util::future::poll_fn(|cx| {
         //     Pin::new(&amp;mut mock).poll_write_buf(cx, &amp;mut Cursor::new(&amp;[]))
         // })
         // .await
         // .expect_err(&quot;should be a broken pipe&quot;);

         // // underlying io will return the logic error upon write,
         // // so we are testing that the io_buf does not trigger a write
         // // when there is nothing to flush
         // let mock = Mock::new().build();
         // let mut io_buf = Buffered::&lt;_, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);
         // io_buf.flush().await.expect(&quot;should short-circuit flush&quot;);
     </span>}

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>parse_reads_until_blocked() {
         <span class="kw">use </span><span class="kw">crate</span>::proto::h1::ClientTransaction;

         <span class="kw">let _ </span>= pretty_env_logger::try_init();
         <span class="kw">let </span>mock = Mock::new()
             <span class="comment">// Split over multiple reads will read all of it
             </span>.read(<span class="string">b&quot;HTTP/1.1 200 OK\r\n&quot;</span>)
             .read(<span class="string">b&quot;Server: hyper\r\n&quot;</span>)
             <span class="comment">// missing last line ending
             </span>.wait(Duration::from_secs(<span class="number">1</span>))
             .build();

         <span class="kw">let </span><span class="kw-2">mut </span>buffered = Buffered::&lt;<span class="kw">_</span>, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);

         <span class="comment">// We expect a `parse` to be not ready, and so can&#39;t await it directly.
         // Rather, this `poll_fn` will wrap the `Poll` result.
         </span>futures_util::future::poll_fn(|cx| {
             <span class="kw">let </span>parse_ctx = ParseContext {
                 cached_headers: <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>,
                 req_method: <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>,
                 h1_parser_config: Default::default(),
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
                 </span>h1_header_read_timeout: <span class="prelude-val">None</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
                 </span>h1_header_read_timeout_fut: <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
                 </span>h1_header_read_timeout_running: <span class="kw-2">&amp;mut </span><span class="bool-val">false</span>,
                 preserve_header_case: <span class="bool-val">false</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                 </span>preserve_header_order: <span class="bool-val">false</span>,
                 h09_responses: <span class="bool-val">false</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                 </span>on_informational: <span class="kw-2">&amp;mut </span><span class="prelude-val">None</span>,
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                 </span>raw_headers: <span class="bool-val">false</span>,
             };
             <span class="macro">assert!</span>(buffered
                 .parse::&lt;ClientTransaction&gt;(cx, parse_ctx)
                 .is_pending());
             Poll::Ready(())
         })
         .<span class="kw">await</span>;

         <span class="macro">assert_eq!</span>(
             buffered.read_buf,
             <span class="string">b&quot;HTTP/1.1 200 OK\r\nServer: hyper\r\n&quot;</span>[..]
         );
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>read_strategy_adaptive_increments() {
         <span class="kw">let </span><span class="kw-2">mut </span>strategy = ReadStrategy::default();
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">8192</span>);

         <span class="comment">// Grows if record == next
         </span>strategy.record(<span class="number">8192</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">16384</span>);

         strategy.record(<span class="number">16384</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">32768</span>);

         <span class="comment">// Enormous records still increment at same rate
         </span>strategy.record(::std::usize::MAX);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">65536</span>);

         <span class="kw">let </span>max = strategy.max();
         <span class="kw">while </span>strategy.next() &lt; max {
             strategy.record(max);
         }

         <span class="macro">assert_eq!</span>(strategy.next(), max, <span class="string">&quot;never goes over max&quot;</span>);
         strategy.record(max + <span class="number">1</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), max, <span class="string">&quot;never goes over max&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>read_strategy_adaptive_decrements() {
         <span class="kw">let </span><span class="kw-2">mut </span>strategy = ReadStrategy::default();
         strategy.record(<span class="number">8192</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">16384</span>);

         strategy.record(<span class="number">1</span>);
         <span class="macro">assert_eq!</span>(
             strategy.next(),
             <span class="number">16384</span>,
             <span class="string">&quot;first smaller record doesn&#39;t decrement yet&quot;
         </span>);
         strategy.record(<span class="number">8192</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">16384</span>, <span class="string">&quot;record was with range&quot;</span>);

         strategy.record(<span class="number">1</span>);
         <span class="macro">assert_eq!</span>(
             strategy.next(),
             <span class="number">16384</span>,
             <span class="string">&quot;in-range record should make this the &#39;first&#39; again&quot;
         </span>);

         strategy.record(<span class="number">1</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">8192</span>, <span class="string">&quot;second smaller record decrements&quot;</span>);

         strategy.record(<span class="number">1</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">8192</span>, <span class="string">&quot;first doesn&#39;t decrement&quot;</span>);
         strategy.record(<span class="number">1</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">8192</span>, <span class="string">&quot;doesn&#39;t decrement under minimum&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>read_strategy_adaptive_stays_the_same() {
         <span class="kw">let </span><span class="kw-2">mut </span>strategy = ReadStrategy::default();
         strategy.record(<span class="number">8192</span>);
         <span class="macro">assert_eq!</span>(strategy.next(), <span class="number">16384</span>);

         strategy.record(<span class="number">8193</span>);
         <span class="macro">assert_eq!</span>(
             strategy.next(),
             <span class="number">16384</span>,
             <span class="string">&quot;first smaller record doesn&#39;t decrement yet&quot;
         </span>);

         strategy.record(<span class="number">8193</span>);
         <span class="macro">assert_eq!</span>(
             strategy.next(),
             <span class="number">16384</span>,
             <span class="string">&quot;with current step does not decrement&quot;
         </span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>read_strategy_adaptive_max_fuzz() {
         <span class="kw">fn </span>fuzz(max: usize) {
             <span class="kw">let </span><span class="kw-2">mut </span>strategy = ReadStrategy::with_max(max);
             <span class="kw">while </span>strategy.next() &lt; max {
                 strategy.record(::std::usize::MAX);
             }
             <span class="kw">let </span><span class="kw-2">mut </span>next = strategy.next();
             <span class="kw">while </span>next &gt; <span class="number">8192 </span>{
                 strategy.record(<span class="number">1</span>);
                 strategy.record(<span class="number">1</span>);
                 next = strategy.next();
                 <span class="macro">assert!</span>(
                     next.is_power_of_two(),
                     <span class="string">&quot;decrement should be powers of two: {} (max = {})&quot;</span>,
                     next,
                     max,
                 );
             }
         }

         <span class="kw">let </span><span class="kw-2">mut </span>max = <span class="number">8192</span>;
         <span class="kw">while </span>max &lt; std::usize::MAX {
             fuzz(max);
             max = (max / <span class="number">2</span>).saturating_mul(<span class="number">3</span>);
         }
         fuzz(::std::usize::MAX);
     }

     <span class="attribute">#[test]
     #[should_panic]
     #[cfg(debug_assertions)] </span><span class="comment">// needs to trigger a debug_assert
     </span><span class="kw">fn </span>write_buf_requires_non_empty_bufs() {
         <span class="kw">let </span>mock = Mock::new().build();
         <span class="kw">let </span><span class="kw-2">mut </span>buffered = Buffered::&lt;<span class="kw">_</span>, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);

         buffered.buffer(Cursor::new(Vec::new()));
     }

     <span class="comment">/*
     TODO: needs tokio_test::io to allow configure write_buf calls
     #[test]
     fn write_buf_queue() {
         let _ = pretty_env_logger::try_init();

         let mock = AsyncIo::new_buf(vec![], 1024);
         let mut buffered = Buffered::&lt;_, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);


         buffered.headers_buf().extend(b&quot;hello &quot;);
         buffered.buffer(Cursor::new(b&quot;world, &quot;.to_vec()));
         buffered.buffer(Cursor::new(b&quot;it&#39;s &quot;.to_vec()));
         buffered.buffer(Cursor::new(b&quot;hyper!&quot;.to_vec()));
         assert_eq!(buffered.write_buf.queue.bufs_cnt(), 3);
         buffered.flush().unwrap();

         assert_eq!(buffered.io, b&quot;hello world, it&#39;s hyper!&quot;);
         assert_eq!(buffered.io.num_writes(), 1);
         assert_eq!(buffered.write_buf.queue.bufs_cnt(), 0);
     }
     */

     </span><span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>write_buf_flatten() {
         <span class="kw">let _ </span>= pretty_env_logger::try_init();

         <span class="kw">let </span>mock = Mock::new().write(<span class="string">b&quot;hello world, it&#39;s hyper!&quot;</span>).build();

         <span class="kw">let </span><span class="kw-2">mut </span>buffered = Buffered::&lt;<span class="kw">_</span>, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);
         buffered.write_buf.set_strategy(WriteStrategy::Flatten);

         buffered.headers_buf().extend(<span class="string">b&quot;hello &quot;</span>);
         buffered.buffer(Cursor::new(<span class="string">b&quot;world, &quot;</span>.to_vec()));
         buffered.buffer(Cursor::new(<span class="string">b&quot;it&#39;s &quot;</span>.to_vec()));
         buffered.buffer(Cursor::new(<span class="string">b&quot;hyper!&quot;</span>.to_vec()));
         <span class="macro">assert_eq!</span>(buffered.write_buf.queue.bufs_cnt(), <span class="number">0</span>);

         buffered.flush().<span class="kw">await</span>.expect(<span class="string">&quot;flush&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>write_buf_flatten_partially_flushed() {
         <span class="kw">let _ </span>= pretty_env_logger::try_init();

         <span class="kw">let </span>b = |s: <span class="kw-2">&amp;</span>str| Cursor::new(s.as_bytes().to_vec());

         <span class="kw">let </span><span class="kw-2">mut </span>write_buf = WriteBuf::&lt;Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(WriteStrategy::Flatten);

         write_buf.buffer(b(<span class="string">&quot;hello &quot;</span>));
         write_buf.buffer(b(<span class="string">&quot;world, &quot;</span>));

         <span class="macro">assert_eq!</span>(write_buf.chunk(), <span class="string">b&quot;hello world, &quot;</span>);

         <span class="comment">// advance most of the way, but not all
         </span>write_buf.advance(<span class="number">11</span>);

         <span class="macro">assert_eq!</span>(write_buf.chunk(), <span class="string">b&quot;, &quot;</span>);
         <span class="macro">assert_eq!</span>(write_buf.headers.pos, <span class="number">11</span>);
         <span class="macro">assert_eq!</span>(write_buf.headers.bytes.capacity(), INIT_BUFFER_SIZE);

         <span class="comment">// there&#39;s still room in the headers buffer, so just push on the end
         </span>write_buf.buffer(b(<span class="string">&quot;it&#39;s hyper!&quot;</span>));

         <span class="macro">assert_eq!</span>(write_buf.chunk(), <span class="string">b&quot;, it&#39;s hyper!&quot;</span>);
         <span class="macro">assert_eq!</span>(write_buf.headers.pos, <span class="number">11</span>);

         <span class="kw">let </span>rem1 = write_buf.remaining();
         <span class="kw">let </span>cap = write_buf.headers.bytes.capacity();

         <span class="comment">// but when this would go over capacity, don&#39;t copy the old bytes
         </span>write_buf.buffer(Cursor::new(<span class="macro">vec!</span>[<span class="string">b&#39;X&#39;</span>; cap]));
         <span class="macro">assert_eq!</span>(write_buf.remaining(), cap + rem1);
         <span class="macro">assert_eq!</span>(write_buf.headers.pos, <span class="number">0</span>);
     }

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>write_buf_queue_disable_auto() {
         <span class="kw">let _ </span>= pretty_env_logger::try_init();

         <span class="kw">let </span>mock = Mock::new()
             .write(<span class="string">b&quot;hello &quot;</span>)
             .write(<span class="string">b&quot;world, &quot;</span>)
             .write(<span class="string">b&quot;it&#39;s &quot;</span>)
             .write(<span class="string">b&quot;hyper!&quot;</span>)
             .build();

         <span class="kw">let </span><span class="kw-2">mut </span>buffered = Buffered::&lt;<span class="kw">_</span>, Cursor&lt;Vec&lt;u8&gt;&gt;&gt;::new(mock);
         buffered.write_buf.set_strategy(WriteStrategy::Queue);

         <span class="comment">// we have 4 buffers, and vec IO disabled, but explicitly said
         // don&#39;t try to auto detect (via setting strategy above)

         </span>buffered.headers_buf().extend(<span class="string">b&quot;hello &quot;</span>);
         buffered.buffer(Cursor::new(<span class="string">b&quot;world, &quot;</span>.to_vec()));
         buffered.buffer(Cursor::new(<span class="string">b&quot;it&#39;s &quot;</span>.to_vec()));
         buffered.buffer(Cursor::new(<span class="string">b&quot;hyper!&quot;</span>.to_vec()));
         <span class="macro">assert_eq!</span>(buffered.write_buf.queue.bufs_cnt(), <span class="number">3</span>);

         buffered.flush().<span class="kw">await</span>.expect(<span class="string">&quot;flush&quot;</span>);

         <span class="macro">assert_eq!</span>(buffered.write_buf.queue.bufs_cnt(), <span class="number">0</span>);
     }

     <span class="comment">// #[cfg(feature = &quot;nightly&quot;)]
     // #[bench]
     // fn bench_write_buf_flatten_buffer_chunk(b: &amp;mut Bencher) {
     //     let s = &quot;Hello, World!&quot;;
     //     b.bytes = s.len() as u64;

     //     let mut write_buf = WriteBuf::&lt;bytes::Bytes&gt;::new();
     //     write_buf.set_strategy(WriteStrategy::Flatten);
     //     b.iter(|| {
     //         let chunk = bytes::Bytes::from(s);
     //         write_buf.buffer(chunk);
     //         ::test::black_box(&amp;write_buf);
     //         write_buf.headers.bytes.clear();
     //     })
     // }
 </span>}
 </code></pre></div>
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