Mastodon in wrongly unquoting URL path in `(request-target)`, and thus Libervia was doing
the same to check signature. However that doesn't work with Pleroma which is using the
path value used in the request (percent-encoded), and thus Pleroma signature were
rejected.
To work around that, signature is first checked without unquoting, and if this fails a new
check is done with unquoting.
Bug has been reported at https://github.com/mastodon/mastodon/issues/18871
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