Add basic ServerName example & impl.

Makefile

@@ -1,4 +1,4 @@
-EXAMPLE_FILES := HelloWorld EchoServer BroadcastingEchoServer UpgradeSync UpgradeAsync
+EXAMPLE_FILES := HelloWorld ServerName EchoServer BroadcastingEchoServer UpgradeSync UpgradeAsync
 THREADED_EXAMPLE_FILES := HelloWorldThreaded EchoServerThreaded
 override CXXFLAGS += -lpthread -Wconversion -std=c++17 -Isrc -IuSockets/src
 override LDFLAGS += uSockets/*.o -lz

examples/ServerName.cpp

@@ -0,0 +1,24 @@
+#include "App.h"
+
+/* Note that uWS::SSLApp({options}) is the same as uWS::App() when compiled without SSL support */
+
+int main() {
+	/* Overly simple hello world app (SNI) */
+	uWS::SSLApp({
+	  .key_file_name = "../misc/key.pem",
+	  .cert_file_name = "../misc/cert.pem",
+	  .passphrase = "1234"
+	}).addServerName("localhost", {
+	  .key_file_name = "../misc/key.pem",
+	  .cert_file_name = "../misc/cert.pem",
+	  .passphrase = "1234"
+	}).get("/*", [](auto *res, auto *req) {
+	    res->end("Hello world!");
+	}).listen(3000, [](auto *token) {
+	    if (token) {
+		std::cout << "Listening on port " << 3000 << std::endl;
+	    }
+	}).run();
+
+	std::cout << "Failed to listen on port 3000" << std::endl;
+}

src/App.h

@@ -38,6 +38,13 @@ private:
 
 public:
 
+    /* Server name */
+    TemplatedApp &&addServerName(std::string hostname_pattern, us_socket_context_options_t options = {}) {
+
+        us_socket_context_add_server_name(SSL, (struct us_socket_context_t *) httpContext, hostname_pattern.c_str(), options);
+        return std::move(*this);
+    }
+
     /* Returns the SSL_CTX of this app, or nullptr. */
     void *getNativeHandle() {
         return us_socket_context_get_native_handle(SSL, (struct us_socket_context_t *) httpContext);