Only use endpoint origin when rewriting csp in webviews

src/vs/workbench/contrib/webview/browser/pre/main.js

@@ -308,7 +308,12 @@
 			} else {
 				// Rewrite vscode-resource in csp
 				if (data.endpoint) {
-					csp.setAttribute('content', csp.getAttribute('content').replace(/vscode-resource:/g, data.endpoint));
+					try {
+						const endpointUrl = new URL(data.endpoint);
+						csp.setAttribute('content', csp.getAttribute('content').replace(/vscode-resource:(?=(\s|;|$))/g, endpointUrl.origin));
+					} catch (e) {
+						console.error('Could not rewrite csp');
+					}
 				}
 			}