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diff --git a/doc-src/features/responsestreaming.html b/doc-src/features/responsestreaming.html new file mode 100644 index 00000000..d20af65c --- /dev/null +++ b/doc-src/features/responsestreaming.html @@ -0,0 +1,50 @@ +By using mitmproxy's streaming feature, response contents can be passed to the client incrementally before they have been fully received by the proxy. +This is especially useful for large binary files such as videos, where buffering the whole file slows down the client's browser. + +By default, mitmproxy will read the entire response, perform any indicated +manipulations on it and then send the (possibly modified) response to +the client. In some cases this is undesirable and you may wish to "stream" +the reponse back to the client. When streaming is enabled, the response is +not buffered on the proxy but directly sent back to the client instead. + +<h2>On the command-line</h2> + +Streaming can be enabled on the command line for all response bodies exceeding a certain size. The SIZE argument understands +k/m/g suffixes, e.g. 3m for 3 megabytes. + +<table class="table"> + <tbody> + <tr> + <th width="20%">command-line</th> + <td> + --stream SIZE + </td> + </tr> + </tbody> +</table> + + +<h2>Caveats</h2> + +When response streaming is enabled, <strong>streamed response contents will not be + recorded or preserved in any way.</strong> + +When response streaming is enabled, the response body cannot be modified. + +<h2>Customizing Response Streaming</h2> + +You can also use an <a href="@!urlTo("scripting/inlinescripts.html")!@">inline script</a> to customize exactly +which responses are streamed. + +Responses that should be tagged for streaming by setting their respective .stream attribute to True: + +$!example("examples/stream.py")!$ + + +<h2>Implementation Details</h2> + +When response streaming is enabled, portions of the code which would have otherwise performed changes +on the response body will see an empty response body instead (<code>libmproxy.protocol.http.CONTENT_MISSING</code>). Any modifications will be ignored. + +Streamed responses are usually sent in chunks of 4096 bytes. If the response is sent with a <code>Transfer-Encoding: + chunked</code> header, the response will be streamed one chunk at a time.
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