hydra-proxy: allow anubis bypass for nix.dev

Author: mweinelt

build/hydra-proxy.nix

@@ -38,10 +38,22 @@
       worker_processes auto;
     '';
 
+    appendHttpConfig = ''
+      map $http_x_from $upstream {
+        default "anubis";
+        nix.dev-Uogho3gi "hydra-server";
+      }
+    '';
+
     eventsConfig = ''
       worker_connections 1024;
     '';
 
+    upstreams = {
+      anubis.servers."127.0.0.1:3001" = { };
+      hydra-server.servers."127.0.0.1:3000" = { };
+    };
+
     virtualHosts."hydra.nixos.org" = {
       forceSSL = true;
       enableACME = true;
@@ -64,7 +76,7 @@
       '';
 
       locations."/" = {
-        proxyPass = "http://127.0.0.1:3001";
+        proxyPass = "http://$upstream";
       };
 
       locations."/static/" = {