Examples set reuse_address(true)

fix #1027

example/websocket/server/coro/websocket_server_coro.cpp

@@ -92,6 +92,11 @@ do_listen(
     if(ec)
         return fail(ec, "open");
 
+    // Allow address reuse
+    acceptor.set_option(boost::asio::socket_base::reuse_address(true));
+    if(ec)
+        return fail(ec, "set_option");
+
     // Bind to the server address
     acceptor.bind(endpoint, ec);
     if(ec)