include modes on EchoDriver

src/server/cdp/domains/network.zig

@@ -1306,6 +1306,9 @@ const EchoDriver = struct {
             .method = .POST,
             .url = "http://127.0.0.1:9582/echo_body",
             .body = body,
+            .origin = bc.security_origin,
+            .request_mode = .no_cors,
+            .credentials_mode = .same_origin,
             .resource_type = .fetch,
             .notification = bc.session.notification,
             .ctx = &driver,