Hi, I was using the icap server to do client authentication, I was wondering if the following is a valid transaction. Squid did not send anything back to the browser. Squid version 3.1.4. Found the previous thread about a similar issue: http://www.spinics.net/lists/squid/msg49394.html Is there a bug already submitted, I searched the squid bug list, didn't find anything fits the description. REQMOD icap://127.0.0.1:5099/pxyscn/reqmod ICAP/1.0 Host: 127.0.0.1:5099 Date: Mon, 23 Aug 2010 15:26:40 GMT Encapsulated: req-hdr=0, null-body=415 Allow: 204 X-Client-IP: 10.1.19.70 GET http://www.freebsd.org/ HTTP/1.1 Host: www.freebsd.org User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.5.9-1.fc11 Firefox/3.5.9 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Cookie: style=Normal Text Cache-Control: max-age=0 ICAP/1.0 200 OK Date: Mon, 23 Aug 2010 15:26:40 UTC ISTags: XYZ123 Server: XYZ ICAP Server Connection: close Encapsulated: res-hdr=0, res-body=110 HTTP/1.1 407 Proxy Authentication Required Cache-Control: no-cache Proxy-Authenticate: Basic realm="XYZ" Thanks in advance, Ming