69 lines
2.3 KiB
ReStructuredText
69 lines
2.3 KiB
ReStructuredText
.. _responsestreaming:
|
|
|
|
Response Streaming
|
|
==================
|
|
|
|
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 response back to the client. When streaming is enabled, the response is
|
|
not buffered on the proxy but directly sent back to the client instead.
|
|
|
|
On the command-line
|
|
-------------------
|
|
|
|
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.
|
|
|
|
================== =================
|
|
command-line ``--stream SIZE``
|
|
================== =================
|
|
|
|
.. warning::
|
|
|
|
When response streaming is enabled, **streamed response contents will not be
|
|
recorded or preserved in any way.**
|
|
|
|
.. note::
|
|
|
|
When response streaming is enabled, the response body cannot be modified by the usual means.
|
|
|
|
Customizing Response Streaming
|
|
------------------------------
|
|
|
|
You can also use an :ref:`inlinescripts` to customize exactly
|
|
which responses are streamed.
|
|
|
|
Responses that should be tagged for streaming by setting their ``.stream`` attribute to ``True``:
|
|
|
|
.. literalinclude:: ../../examples/stream.py
|
|
:caption: examples/stream.py
|
|
:language: python
|
|
|
|
Implementation Details
|
|
----------------------
|
|
|
|
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. Any modifications will be ignored.
|
|
|
|
Streamed responses are usually sent in chunks of 4096 bytes. If the response is sent with a
|
|
``Transfer-Encoding: chunked`` header, the response will be streamed one chunk at a time.
|
|
|
|
Modifying streamed data
|
|
-----------------------
|
|
|
|
If the ``.stream`` attribute is callable, ``.stream`` will wrap the generator that yields all
|
|
chunks.
|
|
|
|
.. literalinclude:: ../../examples/stream_modify.py
|
|
:caption: examples/stream_modify.py
|
|
:language: python
|
|
|
|
.. seealso::
|
|
|
|
- :ref:`passthrough`
|