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<div class="subTitle">org.apache.juneau.http</div>
<h2 title="Class Expect" class="title">Class Expect</h2>
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<li><a href="../../../../org/apache/juneau/http/BasicHeader.html" title="class in org.apache.juneau.http">org.apache.juneau.http.BasicHeader</a></li>
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<dd><a href="../../../../org/apache/juneau/http/HttpHeader.html" title="interface in org.apache.juneau.http">HttpHeader</a></dd>
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<pre><a href="../../../../org/apache/juneau/http/annotation/Header.html" title="annotation in org.apache.juneau.http.annotation">@Header</a>(<a href="../../../../org/apache/juneau/http/annotation/Header.html#value--">value</a>="Expect")
public final class <a href="../../../../src-html/org/apache/juneau/http/Expect.html#line.70">Expect</a>
extends <a href="../../../../org/apache/juneau/http/BasicStringHeader.html" title="class in org.apache.juneau.http">BasicStringHeader</a></pre>
<div class="block">Represents a parsed <l>Expect</l> HTTP request header.
<p>
Indicates that particular server behaviors are required by the client.
<h5 class='figure'>Example</h5>
<p class='bcode w800'>
Expect: 100-continue
</p>
<h5 class='topic'>RFC2616 Specification</h5>
The Expect request-header field is used to indicate that particular server behaviors are required by the client.
<p class='bcode w800'>
Expect = "Expect" ":" 1#expectation
expectation = "100-continue" | expectation-extension
expectation-extension = token [ "=" ( token | quoted-string )
*expect-params ]
expect-params = ";" token [ "=" ( token | quoted-string ) ]
</p>
<p>
A server that does not understand or is unable to comply with any of the expectation values in the Expect field of a
request MUST respond with appropriate error status.
The server MUST respond with a 417 (Expectation Failed) status if any of the expectations cannot be met or, if there
are other problems with the request, some other 4xx status.
<p>
This header field is defined with extensible syntax to allow for future extensions.
If a server receives a request containing an Expect field that includes an expectation-extension that it does not
support, it MUST respond with a 417 (Expectation Failed) status.
<p>
Comparison of expectation values is case-insensitive for unquoted tokens (including the 100-continue token), and is
case-sensitive for quoted-string expectation-extensions.
<p>
The Expect mechanism is hop-by-hop: that is, an HTTP/1.1 proxy MUST return a 417 (Expectation Failed) status if it
receives a request with an expectation that it cannot meet.
However, the Expect request-header itself is end-to-end; it MUST be forwarded if the request is forwarded.
<p>
Many older HTTP/1.0 and HTTP/1.1 applications do not understand the Expect header.
<p>
See section 8.2.3 for the use of the 100 (continue) status.
<ul class='seealso'>
<li class='extlink'><a class='doclink' href='https://www.w3.org/Protocols/rfc2616/rfc2616.html'>Hypertext Transfer Protocol -- HTTP/1.1</a>
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<td class="colFirst"><code>static <a href="../../../../org/apache/juneau/http/Expect.html" title="class in org.apache.juneau.http">Expect</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/juneau/http/Expect.html#forString-java.lang.String-">forString</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;value)</code>
<div class="block">Returns a parsed <c>Expect</c> header.</div>
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<code><a href="../../../../org/apache/juneau/http/BasicStringHeader.html#eq-java.lang.String-">eq</a>, <a href="../../../../org/apache/juneau/http/BasicStringHeader.html#eqIC-java.lang.String-">eqIC</a></code></li>
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<code><a href="../../../../org/apache/juneau/http/BasicHeader.html#asString--">asString</a>, <a href="../../../../org/apache/juneau/http/BasicHeader.html#getName--">getName</a>, <a href="../../../../org/apache/juneau/http/BasicHeader.html#getValue--">getValue</a>, <a href="../../../../org/apache/juneau/http/BasicHeader.html#toString--">toString</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static&nbsp;<a href="../../../../org/apache/juneau/http/Expect.html" title="class in org.apache.juneau.http">Expect</a>&nbsp;<a href="../../../../src-html/org/apache/juneau/http/Expect.html#line.78">forString</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;value)</pre>
<div class="block">Returns a parsed <c>Expect</c> header.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - The <c>Expect</c> header string.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The parsed <c>Expect</c> header, or <jk>null</jk> if the string was null.</dd>
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