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Document flash message size limit

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Reason: Messages of size 68,493 - 91,326 characters cause flash to fail silently.
Session cookies cannot have such large messages.

Issue: pallets/flask#1789
This commit is contained in:
Prachi Shirish Khadke 2016-06-02 11:26:28 -07:00
parent 41f3d67dff
commit d9a98dd536
1 changed files with 3 additions and 1 deletions
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4
docs/patterns/flashing.rst
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@ -9,7 +9,9 @@ application. Flask provides a really simple way to give feedback to a
user with the flashing system. The flashing system basically makes it
possible to record a message at the end of a request and access it next
request and only next request. This is usually combined with a layout
template that does this.
template that does this. Note that browsers and sometimes web servers enforce
a limit on cookie sizes. This means that flashing messages that are too
large for session cookies causes message flashing to fail silently.
Simple Flashing
---------------