我想仅通过首次访问者通过CloudFlare工作者动态添加http-header 。例如，这些标头：
Link: </path/to/file.css>; rel=preload; as=style; nopush
Link: </path/to/script.js>; rel=preload; as=script; nopush
因此，我需要通过CloudFlare Workers中的JavaScript进行以下操作：
您可以在此处使用代码。
这是CF博客中的一个一般示例（涉及cookie和标头）：
// A Service Worker which skips cache if the request contains
// a cookie.
addEventListener('fetch', event => {
let request = event.request
if (request.headers.has('Cookie')) {
// Cookie present. Add Cache-Control: no-cache.
let newHeaders = new Headers(request.headers)
newHeaders.set('Cache-Control', 'no-cache')
event.respondWith(fetch(request, {headers: newHeaders}))
}
// Use default behavior.
return
})
这是实现您所描述内容的Cloudflare Worker：
addEventListener('fetch', event => {
event.respondWith(handle(event.request))
})
async function handle(request) {
// Check for cookie.
let cookies = request.headers.get('Cookie') || ""
if (cookies.includes("returning=true")) {
// User has been here before. Just pass request through.
return fetch(request)
}
// Forward request to origin, get response.
let response = await fetch(request)
// Copy Response object so that we can edit headers.
response = new Response(response.body, response)
// Add headers.
response.headers.append("Link",
"</path/to/file.css>; rel=preload; as=style; nopush")
response.headers.append("Link",
"</path/to/script.js>; rel=preload; as=script; nopush")
// Set cookie so that we don't add the headers
// next time.
response.headers.set("Set-Cookie", "returning=true")
// Return on to client.
return response
}
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