英文:
cloudflare worker can't forward some of my post requests
问题
我编写了一个Cloudflare Worker来检查授权头。如果缺少授权头，只需转发请求。我发现大多数请求都没问题，但一些POST请求会抛出以下错误：
"exceptions": [
{
"name": "TypeError",
"message": "Cannot reconstruct a Request with a used body.",
"timestamp": 1688611154771
}
],
"logs": [
{
"message": [
"forwarded: https://..."
],
"level": "log",
"timestamp": 1688611154771
}
]
而引发异常的代码如下：
export default {
async fetch(request, env, ctx) {
// 让错误传递到原始服务器
ctx.passThroughOnException();
let fwd_request = new Request(request);
const headers = request.headers;
const auth = headers.get('Authorization')
if (!auth) {
console.log(`forwarded: ${request.url}`)
return fetch(request);
}
...
}
}
所以，console.log被打印出来，但fetch(request)不会改变原始请求。
我为什么会收到这个错误？
英文:
I wrote a cloudflare worker to check headers for authorization. If it is missing, just forward the requests. I found most requests are ok, but some post requests throws errors like this:
"exceptions": [
{
"name": "TypeError",
"message": "Cannot reconstruct a Request with a used body.",
"timestamp": 1688611154771
}
],
"logs": [
{
"message": [
"forwarded: https://..."
],
"level": "log",
"timestamp": 1688611154771
}
]
And the code throws exception is like this:
export default {
async fetch(request, env, ctx) {
// let error pass to the origin server
ctx.passThroughOnException();
let fwd_request = new Request(request);
const headers = request.headers;
const auth = headers.get('Authorization')
if (!auth) {
console.log(`forwarded: ${request.url}`)
return fetch(request);
}
...
So, the console.log is printed out, and fetch(request) doesn't change the original request.
Why I am getting this error?
答案1
得分: 1
这一行：
let fwd_request = new Request(request);
消耗了原始的 request 的主体，并将其传递给 fwd_request。如果在此之后尝试执行 fetch(request)，并且请求具有主体，它将无法工作。您可以改为执行 fetch(fwd_request)，或者您可以延迟构建 fwd_request，直到 if (!auth) 块之后，因为在该块之前似乎不会使用它。
export default {
async fetch(request, env, ctx) {
// 让错误传递到原始服务器
ctx.passThroughOnException();
const headers = request.headers;
const auth = headers.get('Authorization')
if (!auth) {
console.log(`转发请求：${request.url}`)
return fetch(request);
}
let fwd_request = new Request(request);
...
英文:
This line:
let fwd_request = new Request(request);
consumes the original request's body, and transfers it to fwd_request. If you try to do fetch(request) after this, and it has a body, it won't work. You could do fetch(fwd_request) instead, or you could delay constructing fwd_request until after the if (!auth) block, since it looks like you don't use it before that block anyway.
export default {
async fetch(request, env, ctx) {
// let error pass to the origin server
ctx.passThroughOnException();
const headers = request.headers;
const auth = headers.get('Authorization')
if (!auth) {
console.log(`forwarded: ${request.url}`)
return fetch(request);
}
let fwd_request = new Request(request);
...
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