Created
June 4, 2022 03:31
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cloudflare worker CORS proxy
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/** | |
* Usage: | |
* https://worker-name.myusername.workers.dev/?url=http://google.com | |
*/ | |
addEventListener('fetch', event => { | |
event.respondWith(handleRequest(event.request)) | |
}) | |
/** | |
* Respond to the request | |
* @param {Request} request | |
*/ | |
async function handleRequest(request) { | |
if (request.method === "OPTIONS") { | |
return new Response('ok', {headers: { | |
"access-control-allow-origin": request.headers.get('origin'), | |
"access-control-allow-methods": "GET", | |
"access-control-allow-headers": request.headers.get("access-control-request-headers"), | |
}}) | |
} | |
const url = new URL(request.url) | |
const requested_url = url.searchParams.get('url') | |
const userAgent = url.searchParams.get('userAgent') | |
const headers = {...request.headers} | |
if (userAgent) { | |
headers["User-Agent"] = userAgent | |
} | |
const res = await fetch(requested_url, { | |
headers: headers}) | |
const body = await res.arrayBuffer() | |
const resHeaders = {} | |
for (let [k, v] of res.headers.entries()) { | |
resHeaders[k] = v | |
} | |
return new Response(body, { | |
status: res.status, | |
headers: { | |
...resHeaders, | |
"access-control-allow-origin": request.headers.get('origin'), | |
} | |
}) | |
} |
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