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From Stefan Eissing <>
Subject Re: 2.4 pause - mod_http2 patchset Upgrade h2c vs mod_ssl Upgrade tls
Date Mon, 07 Dec 2015 20:39:08 GMT
There can be no 100 after a 101. After a 101, the downstream speaks the new protocol, immediately.

> Am 07.12.2015 um 21:29 schrieb William A Rowe Jr <>:
>> On Mon, Dec 7, 2015 at 2:15 PM, Jacob Champion <> wrote:
>> On Dec 7, 2015 8:43 AM, "William A Rowe Jr" <> wrote:
>> >
>> > makes things more interesting,
it calls out that 101-continue and the request body read precedes the 101-switching protocols.
 Not sure who decided that would be a good idea, sigh...
>> 100-continue can't be after the switch; the new protocol may not have any idea what
continue semantics are. Similarly, the request body sent is still part of an HTTP/1.1 request
and should be processed as such.
>> > but mod_ssl TLS upgrade has these reversed for several good reasons including
the intent to encrypt the request body if present and simple economics of processing.
>> Did you mean "decrypt the request body"?
> Yes, my bad... 
>> The client needs to send its request body in plaintext since servers are free to
completely ignore the Upgrade, right? My reading of the specs is that an Upgrade request is
still a self-contained HTTP/1.1 request, body included.
> No.  If the upgrade is rejected, no 101-switching protocols occurs.  If there was no
Expect: 100-continue then yes, the body seems part of the request headers with no way to anticipate
how to proceed except plaintext, but in the case of an Expect: 100-continue, an an interim
101-switching protocols, a tls handshake, followed by a 100-continue seemed entirely reasonable.
> It appears we did the wrong thing in the absence of an Expect: 100-continue, but as a
practical matter this seems fairly academic since RFC7230 codifies a specific sequence that
we must adopt, and the instances of request bodies in upgrade requests seems philosophical.

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