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New section: Treat Proxy-Scheme as having a default #43

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New section: Treat Proxy-Scheme as having a default #43

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22 changes: 22 additions & 0 deletions draft-ietf-core-corr-clar.md
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Expand Up @@ -535,6 +535,28 @@ Content-Format registrations.
These are not repeated here; they are however quite useful as a
reference when preparing additional Content-Format registrations.

## RFC 7252-5.10.2: Proxy-Scheme

RFC 7252 differentiates between requests made to a forward-proxy
that contain the Proxy-Scheme option (or the Proxy-Uri option)
and regular requests where no Proxy- option is set.

For a unified view on requests, it can be beneficial for implementers (especially of servers)
to treat Proxy-Scheme the same way as Uri-Host
in that it expresses a part of the request URI,
and in that it has a default value influenced by the scheme indicated in the transport's URI compositon rules.

The behavior of a server applying that perspective
is consistent with RFC 7252.
<!-- Stating details here is probably just inviting controversy and do not provide a benefit for the reader:
When acting as a proxy, the server is already required to recognize all of its server names (including variations),
and when not acting as a proxy, the Proxy- options being critical lead to errors anyway.
-->

For compatibility, clients that apply that perspective
do not set the Proxy-Scheme option its value is equal to the default,
but always set when interacting with a declared forward proxy.

# IANA Considerations

This document makes no new requests to IANA.
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