Merge pull request #3 from tomsolem/add-host-header

Add new variable to enable or disable setting the host header

Author: Starefossen

README.md

@@ -33,6 +33,8 @@ environment variables is used in this image:
 * `PROXY_PORT`: Port of the service to proxy
 * `PROXY_PROTOCOL`: Protofol to the service to proxy (`http` or `https`)
 
+* `ADD_HOST_HEADER`: pass the proxy host header downstream (`true` or `false`)
+
 ```
 docker run \
   -e OID_DISCOVERY=https://my-auth-server/auth \

nginx/conf/nginx.conf

@@ -19,6 +19,7 @@ env OIDC_RENEW_ACCESS_TOKEN_ON_EXPIERY;
 env PROXY_HOST;
 env PROXY_PORT;
 env PROXY_PROTOCOL;
+env ADD_HOST_HEADER;
 
 events {
     worker_connections  1024;

nginx/conf/sites/proxy.conf

@@ -11,6 +11,7 @@ server {
     set_by_lua $proxy_host 'return os.getenv("PROXY_HOST")';
     set_by_lua $proxy_port 'return os.getenv("PROXY_PORT")';
     set_by_lua $proxy_protocol 'return os.getenv("PROXY_PROTOCOL")';
+    set_by_lua $add_host_header 'return os.getenv("ADD_HOST_HEADER")';
 
     error_log /dev/stdout notice;
 
@@ -25,7 +26,13 @@ server {
     location / {
       access_by_lua_file lua/auth.lua;
 
-      proxy_set_header    Host $http_host;
+      set $reverse_proxy_host $proxy_host;
+      
+      if ($add_host_header = "true") {
+        set $reverse_proxy_host $http_host;
+      }
+
+      proxy_set_header Host $reverse_proxy_host; 
       proxy_pass $proxy_protocol://$proxy_host:$proxy_port;
     }