fixes bug 162448 "Page takes loooong to load with pipelining enabled [IIS/5.0]"

r=gagan sr=bzbarsky

netwerk/protocol/http/src/nsHttpConnection.cpp

@@ -187,6 +187,7 @@ nsHttpConnection::SupportsPipelining(nsHttpResponseHead *responseHead)
     // the list of servers known to do bad things with pipelined requests
     static const char *bad_servers[] = {
         "Microsoft-IIS/4.",
+        "Microsoft-IIS/5.",
         "Netscape-Enterprise/3.",
         nsnull
     };