nhttp: Support unquoted Authorization header parameters #3665
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Problem
When authenticating using the Digest scheme, some HTTP clients (e.g. httpx) send the
algorithm
parameter even when it was not explicitly specified by the server in theWWW-Authenticate
header. The value is being sent without quotes as required by RFC 7616. This trips up the parsing which only expects quoted parameters and the server return error 400.Example header:
Additionally, I noticed the scheme part (
Digest
) wasn't consumed separately and got attached to the first param instead. In a header like this, withnonce
as the first parameter, its name would be understood asDigest nonce
instead of justnonce
and the value would get ignored.Changes
Digest
scheme at the start is consumed before parsing the parameters. The actual value isn't checked, following the existing pattern. (We only really read nonce and response, the rest is assumed for performance reasons.)separator -> read_par
transition is now fallthrough so it doesn't eat the first char of the value ("
, first char of an unquoted value, etc.)