Comment 1:

It looks like it's trying to parse the http body (the robots.txt) as if it were a
number, 
which suggests that the http header reading code is broken.  But it's working here.
Is it reproducible on your system?

Owner changed to r...@golang.org.

Comment 2 by MauriceGilden:

It's reproducible. I also checked it on another system and everything works fine 
there (both with 41d37c2440fb tip right now). I also compared the response headers 
on both systems for http://www.google.com/robots.txt, they are different. And after 
some more investigation I can now reproduce the error on my other machine by 
changing the DNS server.
The working DNS server is the one from my ISP (T-Online). Not working is 
208.67.222.222 from OpenDNS. I've copied the non-working header below:
HTTP/1.0 200 OK
Content-Type: text/plain
Last-Modified: Tue, 15 Dec 2009 22:15:29 GMT
Set-Cookie: PREF=ID=14d10338add15be8:TM=1263926773:LM=1263926773:S=opq1ThF-KAf2KMDP; 
expires=Thu, 1$
Date: Tue, 19 Jan 2010 18:46:13 GMT
Server: gws
Cache-Control: private, x-gzip-ok=""
X-XSS-Protection: 0
Expires: Tue, 19 Jan 2010 18:46:13 GMT
X-Cache: MISS from .
Via: 1.0 .:80 (squid)
Connection: close
And this is what it probably should look like (and what works):
HTTP/1.0 200 OK
Content-Type: text/plain
Last-Modified: Tue, 15 Dec 2009 22:15:29 GMT
Set-Cookie: PREF=ID=9af674a66d32eab7:TM=1263926792:LM=1263926792:S=WtiYMKLI7a7XELq5; 
expires=Thu, 1$
Date: Tue, 19 Jan 2010 18:46:32 GMT
Server: gws
Cache-Control: private, x-gzip-ok=""
X-XSS-Protection: 0
Expires: Tue, 19 Jan 2010 18:46:32 GMT

Comment 3:

I have reproduced the problem by breaking net's dns implementation to always return the
IP address of the server 
that OpenDNS pretends is www.google.com.
Even though OpenDNS is lying to your computer and directing you to the wrong server, Go
should still be able to 
handle the reply.  Thanks for reporting this.
By the way, if you're avoiding your ISP's DNS server because it is too slow, might I
suggest 8.8.8.8 and 8.8.4.4?  ;-)
http://code.google.com/speed/public-dns/docs/intro.html

Status changed to Accepted.

Comment 5:

This issue was closed by revision 75c6dc9.

Status changed to Fixed.

Merged into issue #-.