=== modified file 'src/client_side_reply.cc'
--- src/client_side_reply.cc	2011-05-09 06:40:03 +0000
+++ src/client_side_reply.cc	2011-05-24 23:13:21 +0000
@@ -1264,9 +1264,9 @@
         hdr->delById(HDR_SET_COOKIE);
     // TODO: RFC 2965 : Must honour Cache-Control: no-cache="set-cookie2" and remove header.
 
-    // if there is not configured a peer proxy with login=PASS option enabled
+    // if there is not configured a peer proxy with login=PASS or login=PASSTHRU option enabled
     // remove the Proxy-Authenticate header
-    if ( !(request->peer_login && strcmp(request->peer_login,"PASS") ==0))
+    if ( !request->peer_login || (strcmp(request->peer_login,"PASS") != 0 && strcmp(request->peer_login,"PASSTHRU") != 0))
         reply->header.delById(HDR_PROXY_AUTHENTICATE);
 
     reply->header.removeHopByHopEntries();