Re: 2.6.STABLE8 in the pipeline

From: ShuXin Zheng <>
Date: Fri, 19 Jan 2007 10:56:49 +0800

Hi, I'm glad to see squid2.6-stable7 began to support chunked transfer.
But I think there are some problem in it. In function "httpBuildRequestPrefix"
of http.c file, the squid builds the http request with "HTTP/1.0", the
web server,
such as MS-IIS, Apache and Tomcat will not reply squid-proxy with
"Transfer-Encoding: chunked" after receiving the HTTP request with the HTTP/1.0
version. So the transfer-encoding process may not be used in real application
environment. The reason is that the RFC2616 describes the following:
1) in "3.6 Transfer Codings" section:
   ... A server MUST NOT send transfer-codings to an HTTP/1.0 client. ...

And there are some problems when handling the condition that
Transfer-Encoding and
Conteng-Length are presented at the same time. See function
in http.c as below:
        if (httpState->flags.chunked && reply->content_length >= 0) {
            /* Can't have a content-length in chunked encoding */
            reply->sline.status = HTTP_INVALID_HEADER;
            return done;
We should prefer to use "Transfer-Encoding" when Transfer-Encoding and
are all presented. See RFC2616 "4.4 Message Length" section:
   3.If a Content-Length header field (section 14.13) is present, its
     decimal value in OCTETs represents both the entity-length and the
     transfer-length. The Content-Length header field MUST NOT be sent
     if these two lengths are different (i.e., if a Transfer-Encoding
     header field is present). If a message is received with both a
     Transfer-Encoding header field and a Content-Length header field,
     the latter MUST be ignored.


On 1/19/07, Henrik Nordstrom <> wrote:
> Due to Bug #1872 2.6.STABLE8 is due for release lot earlier than
> intended (significant cache error introduced in 2.6.STABLE6).
> The next nightly (released in 24 hours) is to be considered a
> 2.6.STABLE8 release candidate. Please give it the best testing you can.
> There has been quite substantial changes since STABLE7, most notably it
> now dechunks chunked encoding should a server send us chunked..
> After this release Squid-2.6 will be branched from Squid-2, allowing
> more intrusive fixes to be tested properly in Squid-2 before getting
> into the release and also avoiding accidental commits while a release is
> being prepared. If you make bugfixes just commit them on Squid-2 HEAD as
> usual.
> Regards
> Henrik

Received on Thu Jan 18 2007 - 19:56:53 MST

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