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class="theme-doc-markdown markdown"><header><h1>Debug Function</h1></header><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3ly5" id="5xx-response-status-code"></a><code>5xx</code> response status code<a class="hash-link" href="#5xx-response-status-code" title="Direct link to heading">#</a></h2><p>Similar <code>5xx</code> status codes such as 500, 502, 503, etc., are the status codes in response to a server error. When a request has a <code>5xx</code> status code; it may come from <code>APISIX</code> or <code>Upstream</code>. How to identify the source of these response status codes is a very meaningful thing. It can quickly help us determine the problem. (When modifying the configuration <code>show_upstream_status_in_response_header</code> in <code>conf/config.yaml</code> to <code>true</code>, all upstream status codes will be returned, not only <code>5xx</code> status.)</p><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3ly5" id="how-to-identify-the-source-of-the-5xx-response-status-code"></a>How to identify the source of the <code>5xx</code> response status code<a class="hash-link" href="#how-to-identify-the-source-of-the-5xx-response-status-code" title="Direct link to heading">#</a></h2><p>In the response header of the request, through the response header of <code>X-APISIX-Upstream-Status</code>, we can effectively identify the source of the <code>5xx</code> status code. When the <code>5xx</code> status code comes from <code>Upstream</code>, the response header <code>X-APISIX-Upstream-Status</code> can be seen in the response header, and the value of this response header is the response status code. When the <code>5xx</code> status code is derived from <code>APISIX</code>, there is no response header information of <code>X-APISIX-Upstream-Status</code> in the response header. That is, only when the status code of <code>5xx</code> is derived from Upstream will the <code>X-APISIX-Upstream-Status</code> response header appear.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor anchor__h2 anchorWithHideOnScrollNavbar_3ly5" id="example"></a>Example<a class="hash-link" href="#example" title="Direct link to heading">#</a></h2><div class="admonition admonition-note alert alert--secondary"><div class="admonition-heading"><h5><span class="admonition-icon"><svg xmlns="http://www.w3.org/2000/svg" width="14" height="16" viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</h5></div><div class="admonition-content"><p>You can fetch the <code>admin_key</code> from <code>config.yaml</code> and save to an environment variable with the following command:</p><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 bash"><pre tabindex="0" class="prism-code language-bash codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token assign-left variable" style="color:#36acaa">admin_key</span><span class="token operator" style="color:#393A34">=</span><span class="token variable" style="color:#36acaa">$(</span><span class="token variable" style="color:#36acaa">yq </span><span class="token variable string" style="color:#e3116c">'.deployment.admin.admin_key[0].key'</span><span class="token variable" style="color:#36acaa"> conf/config.yaml </span><span class="token variable operator" style="color:#393A34">|</span><span class="token variable" style="color:#36acaa"> </span><span class="token variable function" style="color:#d73a49">sed</span><span class="token variable" style="color:#36acaa"> </span><span class="token variable string" style="color:#e3116c">'s/"//g'</span><span class="token variable" style="color:#36acaa">)</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div></div></div><blockquote><p>Example 1: <code>502</code> response status code comes from <code>Upstream</code> (IP address is not available)</p></blockquote><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9180/apisix/admin/routes/1 -H </span><span class="token string" style="color:#e3116c">"X-API-KEY: </span><span class="token string variable" style="color:#36acaa">$admin_key</span><span class="token string" style="color:#e3116c">"</span><span class="token plain"> -X PUT -d </span><span class="token string" style="color:#e3116c">'</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">{</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "methods": ["GET"],</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "upstream": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "nodes": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "127.0.0.1:1": 1</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> },</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "type": "roundrobin"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> },</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "uri": "/hello"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">}'</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>Test:</p><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9080/hello -v</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">..</span><span class="token punctuation" style="color:#393A34">..</span><span class="token punctuation" style="color:#393A34">..</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> HTTP/1.1 </span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Date: Wed, </span><span class="token number" style="color:#36acaa">25</span><span class="token plain"> Nov </span><span class="token number" style="color:#36acaa">2020</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">14</span><span class="token plain">:40:22 GMT</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Content-Type: text/html</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">charset</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">utf-8</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Content-Length: </span><span class="token number" style="color:#36acaa">154</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Connection: keep-alive</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Server: APISIX/2.0</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> X-APISIX-Upstream-Status: </span><span class="token number" style="color:#36acaa">502</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">html</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">head</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">title</span><span class="token operator" style="color:#393A34">></span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/title</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/head</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">body</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">center</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">h</span><span class="token operator file-descriptor important" style="color:#393A34">1</span><span class="token operator" style="color:#393A34">></span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/h</span><span class="token operator file-descriptor important" style="color:#393A34">1</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/center</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">hr</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">center</span><span class="token operator" style="color:#393A34">></span><span class="token plain">openresty</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/center</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/body</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/html</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>It has a response header of <code>X-APISIX-Upstream-Status: 502</code>.</p><blockquote><p>Example 2: <code>502</code> response status code comes from <code>APISIX</code></p></blockquote><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9180/apisix/admin/routes/1 -H </span><span class="token string" style="color:#e3116c">"X-API-KEY: </span><span class="token string variable" style="color:#36acaa">$admin_key</span><span class="token string" style="color:#e3116c">"</span><span class="token plain"> -X PUT -d </span><span class="token string" style="color:#e3116c">'</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">{</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "plugins": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "fault-injection": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "abort": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "http_status": 500,</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "body": "Fault Injection!\n"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> }</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> },</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "uri": "/hello"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">}'</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>Test：</p><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9080/hello -v</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">..</span><span class="token punctuation" style="color:#393A34">..</span><span class="token punctuation" style="color:#393A34">..</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> HTTP/1.1 </span><span class="token number" style="color:#36acaa">500</span><span class="token plain"> Internal Server Error</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Date: Wed, </span><span class="token number" style="color:#36acaa">25</span><span class="token plain"> Nov </span><span class="token number" style="color:#36acaa">2020</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">14</span><span class="token plain">:50:20 GMT</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Content-Type: text/plain</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">charset</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">utf-8</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Transfer-Encoding: chunked</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Connection: keep-alive</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Server: APISIX/2.0</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">Fault Injection</span><span class="token operator" style="color:#393A34">!</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>There is no response header for <code>X-APISIX-Upstream-Status</code>.</p><blockquote><p>Example 3: <code>Upstream</code> has multiple nodes, and all nodes are unavailable</p></blockquote><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9180/apisix/admin/upstreams/1 -H </span><span class="token string" style="color:#e3116c">"X-API-KEY: </span><span class="token string variable" style="color:#36acaa">$admin_key</span><span class="token string" style="color:#e3116c">"</span><span class="token plain"> -X PUT -d </span><span class="token string" style="color:#e3116c">'</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">{</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "nodes": {</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "127.0.0.3:1": 1,</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "127.0.0.2:1": 1,</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "127.0.0.1:1": 1</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> },</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "retries": 2,</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "type": "roundrobin"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">}'</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9180/apisix/admin/routes/1 -H </span><span class="token string" style="color:#e3116c">"X-API-KEY: </span><span class="token string variable" style="color:#36acaa">$admin_key</span><span class="token string" style="color:#e3116c">"</span><span class="token plain"> -X PUT -d </span><span class="token string" style="color:#e3116c">'</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">{</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "uri": "/hello",</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c"> "upstream_id": "1"</span><br></span><span class="token-line" style="color:#393A34"><span class="token string" style="color:#e3116c">}'</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>Test：</p><div class="codeBlockContainer_EiTO"><div class="codeBlockContent_X2I6 shell"><pre tabindex="0" class="prism-code language-shell codeBlock_UxnK thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_W6UD"><span class="token-line" style="color:#393A34"><span class="token plain">$ </span><span class="token function" style="color:#d73a49">curl</span><span class="token plain"> http://127.0.0.1:9080/hello -v</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> HTTP/1.1 </span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Date: Wed, </span><span class="token number" style="color:#36acaa">25</span><span class="token plain"> Nov </span><span class="token number" style="color:#36acaa">2020</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">15</span><span class="token plain">:07:34 GMT</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Content-Type: text/html</span><span class="token punctuation" style="color:#393A34">;</span><span class="token plain"> </span><span class="token assign-left variable" style="color:#36acaa">charset</span><span class="token operator" style="color:#393A34">=</span><span class="token plain">utf-8</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Content-Length: </span><span class="token number" style="color:#36acaa">154</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Connection: keep-alive</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> Server: APISIX/2.0</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"> X-APISIX-Upstream-Status: </span><span class="token number" style="color:#36acaa">502</span><span class="token plain">, </span><span class="token number" style="color:#36acaa">502</span><span class="token plain">, </span><span class="token number" style="color:#36acaa">502</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">html</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">head</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">title</span><span class="token operator" style="color:#393A34">></span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/title</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/head</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">body</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">center</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">h</span><span class="token operator file-descriptor important" style="color:#393A34">1</span><span class="token operator" style="color:#393A34">></span><span class="token number" style="color:#36acaa">502</span><span class="token plain"> Bad Gateway</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/h</span><span class="token operator file-descriptor important" style="color:#393A34">1</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/center</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">hr</span><span class="token operator" style="color:#393A34">></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">center</span><span class="token operator" style="color:#393A34">></span><span class="token plain">openresty</span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/center</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/body</span><span class="token operator" style="color:#393A34">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token operator" style="color:#393A34"><</span><span class="token plain">/html</span><span class="token operator" style="color:#393A34">></span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_V-PD clean-btn">Copy</button></div></div><p>It has a response header of <code>X-APISIX-Upstream-Status: 502, 502, 502</code>.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="/edit#https://github.com/apache/apisix/edit/release/3.14/docs/en/latest/debug-function.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_mS5F" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 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