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70 lines
2.4 KiB
ReStructuredText
70 lines
2.4 KiB
ReStructuredText
.. _responsestreaming:
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Response Streaming
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==================
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By using mitmproxy's streaming feature, response contents can be passed to the client incrementally
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before they have been fully received by the proxy. This is especially useful for large binary files
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such as videos, where buffering the whole file slows down the client's browser.
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By default, mitmproxy will read the entire response, perform any indicated
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manipulations on it and then send the (possibly modified) response to
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the client. In some cases this is undesirable and you may wish to "stream"
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the response back to the client. When streaming is enabled, the response is
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not buffered on the proxy but directly sent back to the client instead.
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On the command-line
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-------------------
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Streaming can be enabled on the command line for all response bodies exceeding a certain size.
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The SIZE argument understands k/m/g suffixes, e.g. 3m for 3 megabytes.
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================== =============================
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command-line :option:`--stream SIZE`
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================== =============================
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.. warning::
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When response streaming is enabled, **streamed response contents will not be
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recorded or preserved in any way.**
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.. note::
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When response streaming is enabled, the response body cannot be modified by the usual means.
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Customizing Response Streaming
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------------------------------
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You can also use an :ref:`inlinescripts` to customize exactly
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which responses are streamed.
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Responses that should be tagged for streaming by setting their ``.stream`` attribute to ``True``:
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.. literalinclude:: ../../examples/stream.py
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:caption: examples/stream.py
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:language: python
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Implementation Details
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----------------------
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When response streaming is enabled, portions of the code which would have otherwise performed
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changes on the response body will see an empty response body instead
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(:py:data:`netlib.http.CONTENT_MISSING`). Any modifications will be ignored.
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Streamed responses are usually sent in chunks of 4096 bytes. If the response is sent with a
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``Transfer-Encoding: chunked`` header, the response will be streamed one chunk at a time.
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Modifying streamed data
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-----------------------
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If the ``.stream`` attribute is callable, ``.stream`` will wrap the generator that yields all
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chunks.
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.. literalinclude:: ../../examples/stream_modify.py
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:caption: examples/stream_modify.py
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:language: python
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.. seealso::
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- :ref:`passthrough`
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