Date: Wed, 27 Dec 2006 19:47:32 -0500 From: Chuck Swiger <cswiger@mac.com> To: Colin Percival <cperciva@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Fwd: Re: pf: BAD state happens often with portsnap fetch update Message-ID: <45931424.8060602@mac.com> In-Reply-To: <45930A5D.1080602@freebsd.org> References: <20061210010823.GS81923@egr.msu.edu> <20061214172323.GP1011@egr.msu.edu> <45908ED3.4040503@freebsd.org> <200612261129.48173.max@love2party.net> <459192A9.2050808@freebsd.org> <4592FF0A.1080400@mac.com> <45930A5D.1080602@freebsd.org>
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Colin Percival wrote:
> Chuck Swiger wrote:
>> FYI, if you pass a:
>>
>> Connection: keep-alive
>>
>> ...header in the request, Squid will not close the client->proxy
>> connection and you ought to be able to re-use it to make additional
>> requests.
>
> In HTTP/1.1, connections are assumed to be persistent unless declared otherwise.
Yeah.
>> PS: Squid "supports HTTP/1.0 persistent connections", from which the HTTP/1.1
>> style keepalives derive-- and quick testing suggests these persistent
>> connections work with either HTTP/1.0 or 1.1 specified in the request.
>
> Grr. I hate adding workarounds to improve compatibility with hopelessly
> antique code (seriously, why doesn't squid support http/1.1 yet?),
See src/HttpMsg.c and/or grep for proxy_keepalive:
/* returns true if connection should be "persistent"
* after processing this message */
int
httpMsgIsPersistent(http_version_t http_ver, const HttpHeader * hdr)
{
#if WHEN_SQUID_IS_HTTP1_1
if ((http_ver.major >= 1) && (http_ver.minor >= 1)) {
/*
* for modern versions of HTTP: persistent unless there is
* a "Connection: close" header.
*/
return !httpHeaderHasConnDir(hdr, "close");
} else {
#else
[ ... ]
> but I guess I'll make phttpget emit a completely bogus "Connection: Keep-Alive"
> header to go along with its HTTP/1.1 requests.
There are lots of proxies and firewalls which restrict connections to HTTP/1.0
behavior besides Squid. It's not that horrible to have to request persistent
connections explicitly if it solves the problem...and I hope it does.
--
-Chuck
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