mod_proxy_http.patch

*** httpd/modules/proxy/mod_proxy_http.c	2016-02-04 12:44:22.135322304 -0800
--- httpd-2.4.18/modules/proxy/mod_proxy_http.c	2015-09-16 06:34:11.000000000 -0700
*************** int ap_proxy_http_request(apr_pool_t *p,
*** 748,758 ****
       */
      if (!r->kept_body && r->main) {
          /* XXX: Why DON'T sub-requests use keepalives? */
!         // LP: Take this out to improve retile performance
!         // As the original comment above says, not sure why keepalives 
!         // are not allowed.
!         // Maybe the close can be made conditional on the request
!         // p_conn->close = 1; 
          old_cl_val = NULL;
          old_te_val = NULL;
          rb_method = RB_STREAM_CL;
--- 748,754 ----
       */
      if (!r->kept_body && r->main) {
          /* XXX: Why DON'T sub-requests use keepalives? */
!         p_conn->close = 1;
          old_cl_val = NULL;
          old_te_val = NULL;
          rb_method = RB_STREAM_CL;