We've just had an interesting support issue come through related to HttpClient. It seems that in a particular configuration Microsoft-IIS/5.0 can't handle receiving an empty Host header. Since HttpClient sends this when an IP address is used, our client is having problems.
The fix for us is simple, we'll just remove the IP address check from the old version of HttpClient we're using (or possibly just tell the client the problem is with their server), however I thought I'd point out the problem as there were discussions a while back on this behavior and as I recall it was a grey area of the HTTP/1.1 spec so this info might be useful. The server correctly handles having no Host header or a the Host address with an IP address, just not a blank one.
I don't know that I'd propose anything change in HttpClient at this stage but thought I'd mention the problem here for the record.
Some sample outputs from my telnet tests:
[EMAIL PROTECTED] videovision]$ telnet 164.116.4.65 80 Trying 164.116.4.65... Connected to web_sql.esd113.k12.wa.us. Escape character is '^]'. GET /esd_cms_filemgr/images/logos/google.gif HTTP/1.1 Host: HTTP/1.1 500 Server Error Server: Microsoft-IIS/5.0 Date: Tue, 01 Apr 2003 22:57:15 GMT Content-Type: text/html Content-Length: 102
<html><head><title>Error</title></head><body>The system cannot find the file specified. </body></html>Connection closed by foreign host.
[EMAIL PROTECTED] videovision]$ telnet 164.116.4.65 80
Trying 164.116.4.65...
Connected to web_sql.esd113.k12.wa.us.
Escape character is '^]'.
GET /esd_cms_filemgr/images/logos/google.gif HTTP/1.1
Host: 164.116.4.65
HTTP/1.1 200 OK Server: Microsoft-IIS/5.0 Date: Tue, 01 Apr 2003 22:57:45 GMT Content-Type: image/gif Accept-Ranges: bytes Last-Modified: Tue, 25 Mar 2003 07:37:56 GMT ETag: "344c673a1f2c21:a58" Content-Length: 2048
GIF89aP <snip>
Regards,
Adrian Sutton.
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