diff --git a/src/Http3App.h b/src/Http3App.h
index 23c3c2a..534edb7 100644
--- a/src/Http3App.h
+++ b/src/Http3App.h
@@ -25,8 +25,37 @@ namespace uWS {
             other.http3Context = nullptr;
         }
 
-        H3App &&listen(int port, std::function<void(void *)> cb) {
+        /* Host, port, callback */
+        H3App &&listen(std::string host, int port, MoveOnlyFunction<void(us_listen_socket_t *)> &&handler) {
+            if (!host.length()) {
+                return listen(port, std::move(handler));
+            }
             http3Context->listen();
+            //handler(httpContext ? httpContext->listen(host.c_str(), port, 0) : nullptr);
+            return std::move(*this);
+        }
+
+        /* Host, port, options, callback */
+        H3App &&listen(std::string host, int port, int options, MoveOnlyFunction<void(us_listen_socket_t *)> &&handler) {
+            if (!host.length()) {
+                return listen(port, options, std::move(handler));
+            }
+            http3Context->listen();
+            //handler(httpContext ? httpContext->listen(host.c_str(), port, options) : nullptr);
+            return std::move(*this);
+        }
+
+        /* Port, callback */
+        H3App &&listen(int port, MoveOnlyFunction<void(us_listen_socket_t *)> &&handler) {
+            http3Context->listen();
+            //handler(httpContext ? httpContext->listen(nullptr, port, 0) : nullptr);
+            return std::move(*this);
+        }
+
+        /* Port, options, callback */
+        H3App &&listen(int port, int options, MoveOnlyFunction<void(us_listen_socket_t *)> &&handler) {
+            http3Context->listen();
+            //handler(http3Context ? http3Context->listen(nullptr, port, options) : nullptr);
             return std::move(*this);
         }
 
diff --git a/src/Http3Request.h b/src/Http3Request.h
index 0cae22d..70b016b 100644
--- a/src/Http3Request.h
+++ b/src/Http3Request.h
@@ -12,7 +12,7 @@ namespace uWS {
                 int name_length, value_length;
                 if (more = us_quic_socket_context_get_header(nullptr, i, &name, &name_length, &value, &value_length)) {
                     if (name_length == key.length() && !memcmp(name, key.data(), key.length())) {
-                        return {value, value_length};
+                        return {value, (size_t) value_length};
                     }
                 }
             }