Add missing headers for HTTP/2

Author: johngmyers

CHANGES

@@ -7,6 +7,10 @@ Platform 3.28
   - We have added HTTPServerModule.enableVirtualThreads(), which enables
     Jetty's support for Java 21 virtual threads.
 
+  - We now synthesize the :authority pseudoheader on HTTP/2.
+
+  - We now synthesize the Host header on HTTP/1.0 and HTTP/2.
+
   - Remote errors, when detected, are now notified to async applications.
 
 Platform 3.27

http-server/src/main/java/com/proofpoint/http/server/HttpServer.java

@@ -35,13 +35,15 @@
 import org.eclipse.jetty.ee10.servlet.security.ConstraintMapping;
 import org.eclipse.jetty.ee10.servlet.security.ConstraintSecurityHandler;
 import org.eclipse.jetty.http.UriCompliance;
+import org.eclipse.jetty.http2.server.AuthorityCustomizer;
 import org.eclipse.jetty.http2.server.HTTP2CServerConnectionFactory;
 import org.eclipse.jetty.http2.server.HTTP2ServerConnectionFactory;
 import org.eclipse.jetty.jmx.MBeanContainer;
 import org.eclipse.jetty.security.LoginService;
 import org.eclipse.jetty.security.SecurityHandler;
 import org.eclipse.jetty.security.authentication.BasicAuthenticator;
 import org.eclipse.jetty.server.ConnectionFactory;
+import org.eclipse.jetty.server.HostHeaderCustomizer;
 import org.eclipse.jetty.server.HttpConfiguration;
 import org.eclipse.jetty.server.HttpConnectionFactory;
 import org.eclipse.jetty.server.SecureRequestCustomizer;
@@ -433,6 +435,12 @@ public void start()
         baseHttpConfiguration.setSendServerVersion(false);
         baseHttpConfiguration.setSendXPoweredBy(false);
         baseHttpConfiguration.setNotifyRemoteAsyncErrors(true); // Pass remote exceptions to AsyncContext
+
+        // Adds :authority pseudoheader on HTTP/2
+        baseHttpConfiguration.addCustomizer(new AuthorityCustomizer());
+        // Adds :host header on HTTP/1.0 and HTTP/2
+        baseHttpConfiguration.addCustomizer(new HostHeaderCustomizer());
+
         if (config.getMaxRequestHeaderSize() != null) {
             baseHttpConfiguration.setRequestHeaderSize(toIntExact(config.getMaxRequestHeaderSize().toBytes()));
         }