Re: [squid-users] Invalid Response

apmailist@free.fr wrote:
> Hi,
>
>
>
> I encounter An "invalid Response" on a particular site.
> This is what I get from squid :
> --------------------------
> The requested URL could not be retrieved
>
> While trying to process the request:
>
> GET
> /nms/jsp/webForm.jsp?fo=bl&id=S7Nn7isL2GdroOkABgb1B35boKb4Z2SiMGMFGb/VEkJUIAIA
> HTTP/1.1
> Host: somesite.com
> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9)
> Gecko/20071025 Firefox/2.0.0.9
> Accept:
> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
> Accept-Language: en,en-us;q=0.7,fr-fr;q=0.3
> Accept-Encoding: gzip,deflate
> Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
> Keep-Alive: 300
> Proxy-Connection: keep-alive
> Proxy-Authorization: Basic Y<snip>8=
> --------------------------
>
> relaxed_header_parser value is at "warning".
>
> I had a look at the headers, but couldn't find anything peculiar. But I'm not an
> expert in this field.
> Cache.log has said (I'm not 200% sure if it is related or not :
> 2007/11/05 16:11:53| ctx: enter level 30: '!ê«@'
> 2007/11/05 16:11:53| ctx: enter level 31: 'http://somesite.com/favicon.ico'
> 2007/11/05 16:11:53| ctx: enter level 32: 'http://somesite.com/favicon.ico'
> 2007/11/05 16:11:53| # ctx: suspiciously deep (32) nesting:
>
> With Log_mime_headers on , I have
> 1194278039.445 135 10.7.85.46 TCP_MISS/502 1996 GET
> http://somesite.com/nms/jsp/webForm.jsp? user-andrew DIRECT/213.139.xxx.xxx
> text/html [Host: somesite.com\r\nUser-Agent: Mozilla/5.0 (Windows; U; Windows
> NT 5.1; en-US; rv:1.8.1.9) Gecko/20071025 Firefox/2.0.0.9\r\nAccept:
> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\nAccept-Language:
> en,en-us;q=0.7,fr-fr;q=0.3\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset:
> ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 300\r\nProxy-Connection:
> keep-alive\r\nProxy-Authorization: Basic YXsnipcm8=\r\nPragma:
> no-cache\r\nCache-Control: no-cache\r\n] [HTTP/1.0 502 Bad Gateway\r\nServer:
> squid\r\nDate: Mon, 05 Nov 2007 15:53:59 GMT\r\nContent-Type:
> text/html\r\nContent-Length: 1740\r\nExpires: Mon, 05 Nov 2007 15:53:59
> GMT\r\nX-Squid-Error: ERR_INVALID_RESP 0\r\n\r]
>
> Two tcpdumps, one from the squid server, another one from another internet
> access point, show strange characters just between the headers and the html
> stanza. See the "5ea" , then the "1" , and the "0".
> But this is through Wireshark and I'm not sure about the exactness.

Wireshark is exact to the bit.

>
> --------------------------
> GET /nms/jsp/webForm.jsp?fo=bl&id=S7Nn9L2GdroOkABgb1B35boKb4Z2SiMGMFGb/VEkJUIAIA
> HTTP/1.1
> Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
> application/x-shockwave-flash, application/vnd.ms-excel,
> application/vnd.ms-powerpoint, application/msword, */*
> Accept-Language: fr
> UA-CPU: x86
> Accept-Encoding: gzip, deflate
> User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR
> 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; .NET CLR 2.0.50727)
> Host: somesite.com
> Connection: Keep-Alive
>
> HTTP/1.1 200 OK
> Date: Tue, 06 Nov 2007 04:42:03 GMT
> Server: Apache/2.0.52 (Red Hat)
> Transfer-Encoding: chunked

For starters the server is broken and throwing object that squid can't
handle back at squid. Chunked encoding must not be sent to a HTTP/1.0
client.
IIRC there was one aborted 2.6 release of squid that tried to cope, but
that was reverted out from main due to problems. Henrik would know more
on that.
Check you are running a recent 2.6 stable.

Amos
Received on Fri Nov 09 2007 - 18:10:31 MST