diff --git a/uv/uv.sw.js b/uv/uv.sw.js
index 38b91eb..a2a318f 100644
--- a/uv/uv.sw.js
+++ b/uv/uv.sw.js
@@ -96,6 +96,7 @@ class UVServiceWorker extends EventEmitter {
             };
 
             if (cookieStr) requestCtx.headers.cookie = cookieStr;
+            requestCtx.headers.Host = requestCtx.url.host;
 
 
             const reqEvent = new HookEvent(requestCtx, null, null);
@@ -783,4 +784,4 @@ function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
   } else {
     throw new TypeError('The "emitter" argument must be of type EventEmitter. Received type ' + typeof emitter);
   }
-}
\ No newline at end of file
+}