Index: squid/src/client_side.c
diff -c squid/src/client_side.c:1.561.2.23 squid/src/client_side.c:1.561.2.25
*** squid/src/client_side.c:1.561.2.23	Sun Nov 10 07:33:06 2002
--- squid/src/client_side.c	Mon Nov 11 14:00:23 2002
***************
*** 1357,1362 ****
--- 1357,1379 ----
  	    httpHeaderPutInt(hdr, HDR_AGE,
  		squid_curtime - http->entry->timestamp);
      }
+     /* Filter unproxyable authentication types */
+     if (http->log_type != LOG_TCP_DENIED &&
+ 	(httpHeaderHas(hdr, HDR_WWW_AUTHENTICATE) || httpHeaderHas(hdr, HDR_PROXY_AUTHENTICATE))) {
+ 	HttpHeaderPos pos = HttpHeaderInitPos;
+ 	HttpHeaderEntry *e;
+ 	while ((e = httpHeaderGetEntry(hdr, &pos))) {
+ 	    if (e->id == HDR_WWW_AUTHENTICATE || e->id == HDR_PROXY_AUTHENTICATE) {
+ 		const char *value = strBuf(e->value);
+ 		if ((strncasecmp(value, "NTLM", 4) == 0 &&
+ 			(value[4] == '\0' || value[4] == ' '))
+ 		    ||
+ 		    (strncasecmp(value, "Negotiate", 9) == 0 &&
+ 			(value[9] == '\0' || value[9] == ' ')))
+ 		    httpHeaderDelAt(hdr, pos);
+ 	    }
+ 	}
+     }
      /* Handle authentication headers */
      if (request->auth_user_request)
  	authenticateFixHeader(rep, request->auth_user_request, request, http->flags.accel, 0);