我想首次通过CloudFlare workers动态添加http-header,这是第一次访问者。例如,这些标题:
Link: </path/to/file.css>; rel=preload; as=style; nopush
Link: </path/to/script.js>; rel=preload; as=script; nopush
所以,我需要的是通过JavaScript在CloudFlare Workers中的以下内容:
您可以使用代码here。
以下是来自CF博客的一般示例(涉及cookie和标题):
// 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
})
答案 0 :(得分:6)
这是一个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
}
答案 1 :(得分:1)
如果用户在网站上发表评论,我已设法修改了工作人员并提供了解除Cache-Control
标题的解决方案。
addEventListener('fetch', event => {
event.respondWith(addHeaders(event.request))
})
async function addHeaders(request) {
// Forward request to origin, get response.
let response = await fetch(request)
if (response.headers.has("Content-Type") &&
!response.headers.get("Content-Type").includes("text/html")) {
// File is not text/html. Pass request through.
return fetch(request)
}
// Copy Response object so that we can edit headers.
response = new Response(response.body, response)
// Check for cookie.
let cookies = request.headers.get('Cookie') || ""
if (cookies.includes("returning=true")) {
if (cookies.includes("comment_") && response.headers.has("Cache-Control")) {
// User has commented. Delete "cache-control" header.
response.headers.delete("Cache-Control")
// Return on to client.
return response
}
// User has been here before but has not commented.
// Just pass request through.
return fetch(request)
}
// Add headers.
response.headers.set("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
}
但是,如果您尝试删除首先由Cloudflare设置的标头(在本例中为Cache-Control
),您将遇到一个未知错误1101,这将使您的网站无法访问。此外,您无法修改Cloudflare设置的标头。显然,你只能操纵由origin设置的标题,并最终添加新的标题。