header routing

nginx/html/index.html

@@ -1,13 +1 @@
-hello from nginx!
-
-<button onclick="goToApp('java')">Go to Java</button>
-<button onclick="goToApp('dotnet')">Go to .NET</button>
-<script>
-    function goToApp(appName) {
-        fetch("/", {
-            headers: { "X-App-Type": appName },
-        })
-            .then((r) => r.text())
-            .then((t) => (document.body.innerHTML = t));
-    }
-</script>
+welcome to nginx

nginx/nginx.conf

@@ -1,52 +1,30 @@
-events {}
-
+events { }
 http {
     upstream dotnet_app {
         server dotnet-1;
         server dotnet-2;
     }
-
     upstream java_app {
         server java-1;
         server java-2;
     }
 
-    # Map the header to the chosen upstream
-    map $http_x_app_type $app_upstream {
-        dotnet dotnet_app;
-        java   java_app;
-        default "";
+    map $http_x_app_type $app_backend {
+        default       dotnet_app;
+        "dotnet"      dotnet_app;
+        "java"        java_app;
     }
 
     server {
         listen 80;
 
-        root /usr/share/nginx/html;
-        index index.html;
-
-        #
-        # 1) If header is present -> route here
-        #
-        location @proxy_handler {
-            proxy_pass http://$app_upstream;
+        location / {
+            proxy_pass http://$app_backend;
+            proxy_http_version 1.1;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-        }
-
-        #
-        # 2) Default location for all requests
-        #
-        location / {
-            # If upstream selected -> jump to proxy handler
-            error_page 418 = @proxy_handler;
-
-            if ($app_upstream != "") {
-                return 418;
-            }
-
-            # Otherwise serve index.html or static files
-            try_files $uri $uri/ /index.html;
+            proxy_set_header X-Forwarded-Proto $scheme;
         }
     }
 }