show uv errors properly when cross origin isolated

Author: Percslol

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@titaniumnetwork-dev/ultraviolet",
-    "version": "3.0.0",
+    "version": "3.0.1",
     "description": "Highly sophisticated proxy used for evading internet censorship or accessing websites in a controlled sandbox using the power of service-workers and more!",
     "main": "lib/index.cjs",
     "license": "MIT",

src/uv.sw.js

@@ -556,7 +556,12 @@ function renderError(err, fetchedURL, bareServer) {
      * @type {string}
      */
     let message;
-
+    let headers = {
+        'content-type': 'text/html',
+    };
+    if (crossOriginIsolated) {
+        headers['Cross-Origin-Embedder-Policy'] = 'require-corp';
+    }
     if (isBareError(err)) {
         status = err.status;
         title = 'Error communicating with the Bare server';
@@ -582,9 +587,7 @@ function renderError(err, fetchedURL, bareServer) {
         ),
         {
             status,
-            headers: {
-                'content-type': 'text/html',
-            },
+            headers: headers,
         }
     );
 }