feature: percent-decode before routing #2729
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`axum` has some assumptions about the way paths are structured which may be potentially changed in a minor release. For example, there are plans to support [suffixes in matched segments](ibraheemdev/matchit#17) among other features which would allow routes such as `/{file}.jpg` which `axum` currently does not expect.
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Note that this PR is built on top of #2645 so it also contains its changes. The only relevant change is the last commit.
Closes #2678
Motivation
Matching was happening before percent decoding. Therefore,
/aand/%61were two different paths although according to the spec they shouldn't be.We were also unable to construct routes with special characters that would have to be percent encoded by clients such as
?or users would have to specify their paths already percent encoded when callingroute.Solution
The paths are percent decoded before passing them to
matchit. One exception is the forward slash/, which must not be decoded as that could change the matching behavior. This is achieved by encoding the%in%2fwhich would otherwise be decoded to/and interpreted as a path separator bymatchit::Router. This way, thematchit::Routerstill sees%2fwhich gets decoded later on when inserting matched captures to request extensions.For example with a routes
/api/{resource}and/api/car/{name}, making a call such as/api/car%2fladashould match the first route, not the second one.One drawback of this is that if a user makes a request such as
/%252f_is_slash, which would be captured by route/{capture}, the value of the captured path should be%2f_is_slashbut because slashes are decoded after everything else, this will actually produce/_is_slash. This should be very rare scenario though.Other characters work as intended, e.g. request to
/%2561_awould result in a capture of%61_a.