Re: [squid-users] HTTP/1.0 417 Expectation failed

according RFC what's the case for Squid 2.7 about "HTTP/1.0 417 Expectation
failed", "X-Squid-Error: ERR_INVALID_REQ 0"

A, B, C ,D ?

 RFC says:

 Requirements for HTTP/1.1 proxies:

    A - If a proxy receives a request that includes an Expect request-
        header field with the "100-continue" expectation, and the proxy
        either knows that the next-hop server complies with HTTP/1.1 or
        higher, or does not know the HTTP version of the next-hop
        server, it MUST forward the request, including the Expect header
        field.

     B - If the proxy knows that the version of the next-hop server is
        HTTP/1.0 or lower, it MUST NOT forward the request, and it MUST
        respond with a 417 (Expectation Failed) status.

     C - Proxies SHOULD maintain a cache recording the HTTP version
        numbers received from recently-referenced next-hop servers.

     D - A proxy MUST NOT forward a 100 (Continue) response if the
        request message was received from an HTTP/1.0 (or earlier)
        client and did not include an Expect request-header field with
        the "100-continue" expectation. This requirement overrides the
        general rule for forwarding of 1xx responses (see section 10.1).

----- Original Message -----
From: "Amos Jeffries" <squid3_at_treenet.co.nz>
To: <squid-users_at_squid-cache.org>
Sent: Friday, February 19, 2010 12:14 PM
Subject: Re: [squid-users] HTTP/1.0 417 Expectation failed

> Riccardo Castellani wrote:
>> I'm using Squid 2.7 STABLE3 and I noted my software sends http Request =
>> where there is written:
>>
>> POST http://www.inps.it/...
>> ...
>> Expect: 100-Continue
>>
>>
>> Squid answers saying :
>>
>>
>> HTTP/1.0 417 Expectation failed
>> ...
>> X-Squid-Error: ERR_INVALID_REQ 0
>>
>>
>> Squid uses Expect request ?!
>
> No. Squid is HTTP/1.0 Expect does not exist in that protocol.
>
>> How Can I solve it ?
>
> Write/Use software that knows how to handle Expect response errors
> properly.
>
> When receiving 417 it should be re-trying the POST without the expect
> header, or the delays Expect adds to the system.
>
> Squid other than 2.7 will not produce this error. They will just die in
> unexpected ways if the 100-continue your software asked for actually comes
> back.
>
> Amos
> --
> Please be using
> Current Stable Squid 2.7.STABLE8 or 3.0.STABLE24
> Current Beta Squid 3.1.0.16
Received on Sun Feb 21 2010 - 21:57:18 MST