send empty response body for HEAD requests in default server entry

Author: rossipedia

packages/react-router-dev/config/defaults/entry.server.node.tsx

@@ -18,6 +18,15 @@ export default function handleRequest(
   // If you have middleware enabled:
   // loadContext: RouterContextProvider
 ) {
+
+  // https://httpwg.org/specs/rfc9110.html#HEAD
+  if (request.method.toUpperCase() === 'HEAD') {
+    return new Response(null, {
+      status: responseStatusCode,
+      headers: responseHeaders,
+    })
+  }
+
   return new Promise((resolve, reject) => {
     let shellRendered = false;
     let userAgent = request.headers.get("user-agent");