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Make sure MutableHeaders._list is actually a list #1917

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merged 6 commits into from Oct 21, 2022
Merged

Make sure MutableHeaders._list is actually a list #1917

merged 6 commits into from Oct 21, 2022

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adriangb
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Fixed #1909

alex-oleshkevich
alex-oleshkevich reviewed Oct 19, 2022
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starlette/datastructures.py Outdated
scope: typing.Optional[typing.Mapping[str, typing.Any]] = None,
) -> None:
super().__init__(headers, raw, scope)
self._list = list(self._list)
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I think doing this (line 595) in the parent class is good enough.

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Also a test case covering the issue is wanted.

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Feel free to update the branch, I’m on my phone and AFK the rest of the day

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Same thing. Let's postpone it till morning.

@adriangb
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Looks like the test revealed a very real issue: we assume that MutableHeaders updates the headers but if we cast it to a list were making a copy. So I had to assign this new list back to scope. Guess that makes sense. What do you think @alex-oleshkevich? Thanks for pushing for a test btw, it was the right call here.

@adriangb adriangb merged commit 9aa0db4 into master Oct 21, 2022
@adriangb adriangb deleted the adriangb-patch-1 branch October 21, 2022 12:57
@jarojasm95
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Looks like the test revealed a very real issue: we assume that MutableHeaders updates the headers but if we cast it to a list were making a copy. So I had to assign this new list back to scope. Guess that makes sense. What do you think @alex-oleshkevich? Thanks for pushing for a test btw, it was the right call here.

thank you! this was the problem I was alluding to in #1909 - this definitely fixes it. 💯

aminalaee pushed a commit that referenced this pull request Feb 13, 2023
@adriangb @aminalaee
Make sure MutableHeaders._list is actually a list (#1917)
cee4284
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@adriangb @jarojasm95 @alex-oleshkevich