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David Lord 2026-03-04 07:36:21 -08:00
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15
docs/patterns/streaming.rst
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@ -8,6 +8,21 @@ roundtrip to the filesystem?
The answer is by using generators and direct responses.
HTTP Response Behavior
----------------------
**Headers cannot be changed after the streaming response starts.**
When using streaming, it's important to be aware of the order than an HTTP
response is sent. All headers must be sent first, then the body. More headers
cannot be sent after the body has begun. Therefore, you must make sure all
headers are set before starting the response, outside the generator.
In particular, if the generator will access ``session``, be sure to do so in the
view as well so that the ``Vary: cookie`` header will be set. Do not modify the
session in the generator, as the ``Set-Cookie`` header will already be sent.
Basic Usage
-----------