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. -------------------------- 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 Content-Length: 1532 Connection: close Content-Type: text/html; charset=utf-8 5ea <html> <head> <META http-equiv="Content-Type" content="text/html; charset=utf-8"> snip </body> </html> 1 0 -------------------------- Thank you for your help, Andrew