Patch configuration and log actual port on startup

Sources/Vapor/HTTP/Server/HTTPServer.swift

@@ -307,19 +307,18 @@ public final class HTTPServer: Server, Sendable {
             /// Override the socket path.
             configuration.address = address!
         }
-        
-        /// Print starting message.
+
+        /// Log starting message for debugging before attempting to start the server.
         let scheme = configuration.tlsConfiguration == nil ? "http" : "https"
-        let addressDescription: String
+        var addressDescription: String
         switch configuration.address {
         case .hostname(let hostname, let port):
-            addressDescription = "\(scheme)://\(hostname ?? configuration.hostname):\(port ?? configuration.port)"
+            addressDescription = "\(scheme)://\(hostname ?? Configuration.defaultHostname):\(port ?? Configuration.defaultPort)"
         case .unixDomainSocket(let socketPath):
             addressDescription = "\(scheme)+unix: \(socketPath)"
         }
+        self.configuration.logger.debug("Server starting on \(addressDescription)")
 
-        self.configuration.logger.notice("Server starting on \(addressDescription)")
-
         /// Start the actual `HTTPServer`.
         try self.connection.withLockedValue {
             $0 = try HTTPServerConnection.start(
@@ -331,6 +330,19 @@ public final class HTTPServer: Server, Sendable {
             ).wait()
         }
 
+        /// Override configuration with actual address.
+        /// This may differ from the provided configuation if port 0 was provided, for example.
+        if let localAddress = self.localAddress {
+            if let hostname = localAddress.hostname, let port = localAddress.port {
+                configuration.port = port
+                configuration.hostname = hostname
+                addressDescription = "\(scheme)://\(hostname):\(port)"
+            }
+        }
+
+        /// Log started message with the actual configuration.
+        self.configuration.logger.notice("Server started on \(addressDescription)")
+
         self.configuration = configuration
         self.didStart.withLockedValue { $0 = true }
     }