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document that headers must be set before streaming

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David Lord 2026-03-04 07:36:09 -08:00
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commit a29f88ce6f
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docs/templating.rst
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@ -225,5 +225,11 @@ functions to make this easier to use.
return stream_template("timeline.html")
These functions automatically apply the
:func:`~flask.stream_with_context` wrapper if a request is active, so
that it remains available in the template.
:func:`~flask.stream_with_context` wrapper if a request is active, so that
:data:`.request`, :data:`.session`, and :data:`.g` remain available in the
template.
More headers cannot be sent after the body has begun. Therefore, you must
make sure all headers are set before starting the response. In particular,
if the template will access ``session``, be sure to do so in the view as
well so that the ``Vary: cookie`` header will be set.