Merge pull request #5 from Intellection/add_support_for_request_tracing

Add support for request tracing via X-Request-ID header

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.19.5-3
+
+* Set or forward `X-Request-ID`.
+* Add computed `X-Request-ID` to the access logs.
+
 ## 1.19.5-2
 
 * Forward `X-Forwarded-*` headers to upstream correctly.

config/http.conf

@@ -30,6 +30,13 @@ http {
     ''      $server_port;
   }
 
+  # If we receive X-Request-ID, pass it through; otherwise, pass along the
+  # request_id generated by nginx
+  map $http_x_request_id $proxy_x_request_id {
+    default $http_x_request_id;
+    ''      $request_id;
+  }
+
   proxy_http_version  1.1;
   proxy_set_header    Connection          "";
   proxy_set_header    Host                $host;
@@ -39,6 +46,7 @@ http {
   proxy_set_header    X-Forwarded-Proto   $proxy_x_forwarded_proto;
   proxy_set_header    X-Forwarded-Ssl     $proxy_x_forwarded_ssl;
   proxy_set_header    X-Forwarded-Port    $proxy_x_forwarded_port;
+  proxy_set_header    X-Request-ID        $proxy_x_request_id;
   proxy_set_header    X-Forwarded-Host    $host;
 
   proxy_read_timeout  600s;

config/log.conf

@@ -1,6 +1,6 @@
 log_format main '$remote_addr - $remote_user [$time_local]  $status '
                 '"$request" $body_bytes_sent "$http_referer" '
-                '"$http_user_agent" "$http_x_forwarded_for"';
+                '"$http_user_agent" "$http_x_forwarded_for" $proxy_x_request_id';
 
 access_log /dev/stdout main;
 error_log /dev/stdout warn;