header routing

dotnet/Program.cs

@@ -18,6 +18,7 @@ app.MapGet("/{**ok}", async (HttpContext context) =>
     var headers = request.Headers;
 
     var responseText = new System.Text.StringBuilder();
+    responseText.AppendLine("<pre>");
     responseText.AppendLine($"Server Name: {name}");
     responseText.AppendLine($"IP Address: {ip}");
     responseText.AppendLine($"Method: {method}");
@@ -30,6 +31,7 @@ app.MapGet("/{**ok}", async (HttpContext context) =>
     {
         responseText.AppendLine($"  {header.Key}: {header.Value}");
     }
+    responseText.AppendLine("</pre>");
 
     await context.Response.WriteAsync(responseText.ToString());
 });

java/src/main/java/java_app/spring_boot/Application.java

@@ -5,6 +5,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
 public class Application {
+
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);
     }

java/src/main/java/java_app/spring_boot/MirrorController.java

@@ -1,23 +1,27 @@
 package java_app.spring_boot;
 
-import org.springframework.web.bind.annotation.*;
-import org.springframework.http.HttpHeaders;
 import jakarta.servlet.http.HttpServletRequest;
+import org.springframework.http.HttpHeaders;
+import org.springframework.web.bind.annotation.*;
 
 @RestController
 public class MirrorController {
 
-    private final String serverName = System.getenv().getOrDefault("NAME", "unnamed");
+    private final String serverName = System.getenv().getOrDefault(
+        "NAME",
+        "unnamed"
+    );
 
     @GetMapping(path = "/**") // Obsługuje dowolną ścieżkę
     public String mirrorRequest(HttpServletRequest request) {
-
         String ip = request.getRemoteAddr();
         String method = request.getMethod();
         String scheme = request.getScheme();
         String host = request.getHeader(HttpHeaders.HOST);
         String path = request.getRequestURI();
-        String queryString = request.getQueryString() != null ? "?" + request.getQueryString() : "";
+        String queryString = request.getQueryString() != null
+            ? "?" + request.getQueryString()
+            : "";
 
         StringBuilder responseText = new StringBuilder();
 
@@ -30,10 +34,18 @@ public class MirrorController {
         responseText.append("QueryString: ").append(queryString).append("\n");
         responseText.append("Headers:\n");
 
-        request.getHeaderNames().asIterator().forEachRemaining(headerName -> {
+        request
-            responseText.append("  ").append(headerName).append(": ").append(request.getHeader(headerName)).append("\n");
+            .getHeaderNames()
+            .asIterator()
+            .forEachRemaining(headerName -> {
+                responseText
+                    .append("  ")
+                    .append(headerName)
+                    .append(": ")
+                    .append(request.getHeader(headerName))
+                    .append("\n");
             });
 
-        return "<pre>" + responseText.toString() + "</pre>";
+        return "<pre>" + responseText.toString() + "</pre>\n";
     }
 }

nginx/html/index.html

@@ -1,13 +1 @@
-hello from nginx!
+welcome to 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>

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