diff --git a/qse/lib/http/httpd-proxy.c b/qse/lib/http/httpd-proxy.c
index fd896390..b3e5606b 100644
--- a/qse/lib/http/httpd-proxy.c
+++ b/qse/lib/http/httpd-proxy.c
@@ -296,8 +296,11 @@ static int proxy_capture_client_header (qse_htre_t* req, const qse_mchar_t* key,
 		}
 	}
 
+/* EXPERIMENTAL: REMOVE HEADERS.
+ * FOR EXAMPLE, You can remove Referer to make analysis systems harder time */
 	if (qse_mbscasecmp (key, QSE_MT("Transfer-Encoding")) != 0 &&
-	    qse_mbscasecmp (key, QSE_MT("Content-Length")) != 0)
+	    qse_mbscasecmp (key, QSE_MT("Content-Length")) != 0 /* EXPERIMENTAL */ /* &&
+	    qse_mbscasecmp (key, QSE_MT("Referer")) != 0*/)
 	{
 		return proxy_add_header_to_buffer (proxy, proxy->reqfwdbuf, key, val);
 	}
@@ -983,7 +986,6 @@ static int task_init_proxy (
 			x = httpd->opt.scb.urs.prerewrite (httpd, client, arg->req, arg->rsrc->host, &proxy->url_to_rewrite);
 		if (x <= -1) goto oops;
 
-printf (">>>>>>>>>>>>>>>>>>>>>>>> [%s] <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", proxy->url_to_rewrite);
 		/* enable url rewriting */
 		proxy->flags |= PROXY_REWRITE_URL;
 		if (x == 0) 
@@ -1070,6 +1072,7 @@ printf (">>>>>>>>>>>>>>>>>>>>>>>> [%s] <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", proxy
 
 #if 0
 {
+/* EXPERIMENTAL */
 /* KT FILTERING WORKAROUND POC. KT seems to check the Host: the first packet
  * only.I add 1500 byte space octets between the URL and the HTTP version string.
  * the header is likely to be placed in the second packet. it seems to work. */
@@ -1941,7 +1944,7 @@ if (proxy->flags & PROXY_PEER_NAME_RESOLVED)
 {
 qse_mchar_t xxxx[128];
 qse_nwadtombs (&proxy->peer.nwad, xxxx, 128, QSE_NWADTOMBS_ALL);
-printf ("XXXXXXXXXXXXXXXXXXXXXXXXXX PEER NAME RESOLVED.....TO [%s]\n", xxxx);
+printf ("XXXXXXXXXXXXXXXXXXXXXXXXXX [%s] PEER NAME RESOLVED.....TO [%s]\n", name, xxxx);
 }
 }
 
diff --git a/qse/lib/http/httpd-std-dns.h b/qse/lib/http/httpd-std-dns.h
index 2184818d..55d1fd79 100644
--- a/qse/lib/http/httpd-std-dns.h
+++ b/qse/lib/http/httpd-std-dns.h
@@ -881,8 +881,6 @@ static int dns_send (qse_httpd_t* httpd, qse_httpd_dns_t* dns, const qse_mchar_t
 
 	httpd_xtn = qse_httpd_getxtn (httpd);
 
-printf ("DNS REALLY SENING>>>>>>>>>>>>>>>>>>>>>>>\n");
-
 	ans = dns_get_answer_from_cache (dc, name);
 	if (ans)
 	{
@@ -994,7 +992,8 @@ printf ("DNS REALLY SENING>>>>>>>>>>>>>>>>>>>>>>>\n");
 	    (req->qaaaalen > 0 && sendto (req->dns_socket, req->qaaaa, req->qaaaalen, 0, (struct sockaddr*)&req->dns_skad, req->dns_skadlen) != req->qaaaalen))
 	{
 		qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
-		goto oops;
+		if (httpd->errnum != QSE_HTTPD_EAGAIN || req->dns_retries <= 0) goto oops;
+		/*goto oops;*/
 	}
 
 	/* NOTE: 
@@ -1013,7 +1012,6 @@ printf ("DNS REALLY SENING>>>>>>>>>>>>>>>>>>>>>>>\n");
 	/* increment the number of pending requests */
 	dc->req_count++;
 
-printf ("DNS REALLY SENT>>>>>>>>>>>>>>>>>>>>>>>\n");
 	return 0;
 
 oops:
diff --git a/qse/lib/http/httpd-std-urs.h b/qse/lib/http/httpd-std-urs.h
index 1bcc8801..955e5141 100644
--- a/qse/lib/http/httpd-std-urs.h
+++ b/qse/lib/http/httpd-std-urs.h
@@ -424,7 +424,6 @@ static int urs_send (qse_httpd_t* httpd, qse_httpd_urs_t* urs, const qse_mchar_t
 	qse_size_t url_len;
 	qse_tmr_event_t tmout_event;
 
-printf ("... URS_SEND.....................\n");
 	httpd_xtn = qse_httpd_getxtn (httpd);
 
 	if (dc->req_count >= QSE_COUNTOF(dc->reqs))
@@ -532,7 +531,12 @@ printf ("... URS_SEND.....................\n");
 	if (sendto (req->urs_socket, req->pkt, req->pktlen, 0, (struct sockaddr*)&req->urs_skad, req->urs_skadlen) != req->pktlen)
 	{
 		qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
-		goto oops;
+printf ("URS SENDTO FAILURE........................\n"); /* TODO: logging */
+
+		/* it looks like the EAGAIN is frequently seen on a unix datagram socket
+		 * even with increased SO_SNDBUF size. */
+		if (httpd->errnum != QSE_HTTPD_EAGAIN || req->urs_retries <= 0) goto oops;
+		/* goto oops; */
 	}
 
 	req->dc = dc;
@@ -545,7 +549,6 @@ printf ("... URS_SEND.....................\n");
 	/* increment the number of pending requests */
 	dc->req_count++;
 
-printf ("URS REALLY SENT>>>>>>>>>>>>>>>>>>>>>>>\n");
 	return 0;
 
 oops:
diff --git a/qse/lib/http/httpd-std.c b/qse/lib/http/httpd-std.c
index 791d9c57..00567576 100644
--- a/qse/lib/http/httpd-std.c
+++ b/qse/lib/http/httpd-std.c
@@ -772,7 +772,7 @@ static qse_sck_hnd_t open_client_socket (qse_httpd_t* httpd, int domain, int typ
 	#endif
 	*/
 
-	#if defined(IPV6_V6ONLY)
+	#if defined(AF_INET6) && defined(IPV6_V6ONLY)
 	if (domain == AF_INET6)
 	{
 		flag = 1;
@@ -780,6 +780,16 @@ static qse_sck_hnd_t open_client_socket (qse_httpd_t* httpd, int domain, int typ
 	}
 	#endif
 
+	/*
+	#if defined(AF_UNIX)
+	if (domain == AF_UNIX)
+	{
+		flag = 1000000;
+		setsockopt (fd, SOL_SOCKET, SO_SNDBUF,  (void*)&flag, QSE_SIZEOF(flag));
+	}
+	#endif
+ 	*/
+
 	if (set_socket_nonblock (httpd, fd, 1) <= -1) goto oops;
 
 	#if defined(IPPROTO_SCTP)