Hi.<div><br></div><div>You can refer echo-nginx-module written by agentzh.</div><div>There's a <strong class="final-path" style="background-color:rgb(255,255,255);margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font:inherit;font-weight:bold;font-family:Helvetica,arial,freesans,clean,sans-serif;line-height:25px">ngx_http_echo_subrequest.c </strong><span class="final-path" style="background-color:rgb(255,255,255);margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font:inherit;font-family:Helvetica,arial,freesans,clean,sans-serif;line-height:25px">file in</span></div>
<div><a href="https://github.com/agentzh/echo-nginx-module">https://github.com/agentzh/echo-nginx-module</a>
</div><div><br></div><div>There's lots of sub-request handling code in this file.</div><div>I'm on the way of reading this module.</div><div>Since the subrequest is itself a request.</div><div>There's no difference with getting response body size of a normal request.</div>
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274</div><div class="line" id="LC275" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:1em;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;background-color:transparent">
275 <span class="k" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;font-weight:bold">if</span> <span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">(</span><span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">rb</span> <span class="o" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;font-weight:bold">==</span> <span class="nb" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;color:rgb(0,134,179)">NULL</span><span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">)</span> <span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">{</span></div>
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276 <span class="k" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;font-weight:bold">return</span> <span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">NGX_HTTP_INTERNAL_SERVER_ERROR</span><span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">;</span></div>
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278</div><div class="line" id="LC279" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:1em;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;background-color:transparent">
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280</div><div class="line" id="LC281" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:1em;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;background-color:transparent">
281 <span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">b</span> <span class="o" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;font-weight:bold">=</span> <span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">ngx_calloc_buf</span><span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">(</span><span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">r</span><span class="o" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit;font-weight:bold">-></span><span class="n" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">pool</span><span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">);</span></div>
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284 <span class="p" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;border-style:initial;border-color:initial;font-size:12px;font:inherit">}</span></div>
</pre></div><div> </div><div>To extract a subrequest from a request, I guess there's a function named ngx_http_subrequest in ngx_http_core_module.c</div><div><br></div><div>Hope this can help you!</div><div><br><div class="gmail_quote">
2012/3/20 Brian Moran <span dir="ltr"><<a href="mailto:bmoran@onehub.com">bmoran@onehub.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Sorry about that, inadvertently hit send...<br>
<br><div><div class="im">I am modifying an existing working filter module. I am issuing a subrequest, which is to a URI, or to a static local file (via a location in the config); I'd like to determine the size of the response that I'm getting back from the subrequest.<div>
<br></div><div>In the subrequest's header filter, I'm doing this to find out the response size:</div></div><div><div>if (r->upstream) {</div><div> response_size = r->upstream->headers_in.content_length_n;<span><font color="#888888"><br>
</font></span></div><div> ...</div><div>}</div><div><br></div><div>For the subrequests that result in the static file being streamed from disk, r->upstream is NULL. </div><div>What's the right nginx way to determine in my filter what the size of the 'body' part of the subrequest response is going to be?</div>
<div><br></div><div>Thanks!</div><div><br></div><span><font color="#888888"><div><br></div></font></span></div><div class="im"><div class="gmail_quote">On Mon, Mar 19, 2012 at 9:31 PM, Brian Moran <span dir="ltr"><<a href="mailto:bmoran@onehub.com" target="_blank">bmoran@onehub.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><span><font color="#888888">-- <br>e: <a href="mailto:bmoran@onehub.com" target="_blank">bmoran@onehub.com</a><br>
p: <a href="tel:%2B1%20206%20390%204376" value="+12063904376" target="_blank">+1 206 390 4376</a><br><br>Onehub, Inc.<br><a href="http://www.onehub.com" target="_blank">www.onehub.com</a><br><br>
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>e: <a href="mailto:bmoran@onehub.com" target="_blank">bmoran@onehub.com</a><br>p: +1 206 390 4376<br><br>Onehub, Inc.<br><a href="http://www.onehub.com" target="_blank">www.onehub.com</a><br>
<br>
</div></div>
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