相关疑难解决方法(0)

是否可以更改事件Request接收的对象的标题fetch？

两次尝试:

1. 修改现有标头:

   self.addEventListener('fetch', function (event) {
     event.request.headers.set("foo", "bar");
     event.respondWith(fetch(event.request));
   });
   

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   失败了Failed to execute 'set' on 'Headers': Headers are immutable.

2. 创建新Request对象:

   self.addEventListener('fetch', function (event) {
     var req = new Request(event.request, {
       headers: { "foo": "bar" }
     });
     event.respondWith(fetch(req));
   });
   

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   失败了 Failed to construct 'Request': Cannot construct a Request with a Request whose mode is 'navigate' and a non-empty RequestInit.

(另请参阅如何更改响应的标头？)