Merge of r3964, r3977, r3978: Proxy related fixes: *) finalizing with rc == 0 in unbuffered proxy mode caused nginx to wait for another send_timeout before actually closing client's connection if client timed out while still talking to upstream server *) update r3945 with more descriptive error message *) test length of proxy_pass with variables; patch by Lanshun Zhou

--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1030,6 +1030,8 @@ ngx_http_scgi_create_loc_conf(ngx_conf_t
     /* "scgi_cyclic_temp_file" is disabled */
     conf->upstream.cyclic_temp_file = 0;
 
+    ngx_str_set(&conf->upstream.module, "scgi");
+
     return conf;
 }