[docs] [issue16679] Add advice about non-ASCII wsgiref PATH_INFO

[Martin Panter]

Martin Panter added the comment:

PEP 3333 defers to a draft CGI specification for PATH_INFO and QUERY_STRING: <https://tools.ietf.org/html/draft-coar-cgi-v11-03>. (Dunno why it didn’t reference the final RFC 3875 instead, published 2004.) Anyway, both draft and final RFCs say “PATH_INFO is not URL-encoded”, but “the QUERY_STRING variable contains a URL-encoded search or parameter string”.

Graham, maybe you are seeing Latin-1 code points in PATH_INFO that have been translated from the %XX URL syntax, and QUERY_STRING retaining the original %XX syntax.

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nosy: +martin.panter

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