Both HTTP method and query can have a value of '0' #2280
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Method ABNF is in https://datatracker.ietf.org/doc/html/rfc9110#appendix-A and equivalent to the regex: ^[a-zA-Z0-9!#$%&'*+.^_`|~-]+$
I couldn't find a good place to test this, as parse_env is only called from the cgi and psgi tests; open to suggestion and will happily add some.