使用 XMLHttpRequest 不断收到 No 'Access-Control-Allow-Origin' 错误

Keep getting No #39;Access-Control-Allow-Origin#39; error with XMLHttpRequest(使用 XMLHttpRequest 不断收到 No Access-Control-Allow-Origin 错误)

问题描述

我会通过使用 jQuery $.ajax 函数来解决这个问题，但在这种情况下，jQuery 不是选项.相反，我将使用 CORS 请求.我觉得响应请求的网络服务器有问题，我很难找出问题所在.

I would have solved this issue by using jQuery $.ajax function but in this case jQuery is not option. Instead I am going with CORS request. I feel there is something wrong with the webserver that is responding to the request and I am having a hard time figuring out what the issue is.

这是我创建 CORS 请求的代码

Here is my code for creating the CORS request

var httpRequest = new XMLHttpRequest();
httpRequest.open('POST', url, true);
httpRequest.setRequestHeader( 'Access-Control-Allow-Origin', '*');
httpRequest.setRequestHeader( 'Content-Type', 'application/json' );
httpRequest.onerror = function(XMLHttpRequest, textStatus, errorThrown) {
  console.log( 'The data failed to load :(' );
  console.log(JSON.stringify(XMLHttpRequest));
};
httpRequest.onload = function() {
  console.log('SUCCESS!');
}

这是 console.log 错误:

Here is the console.log error:

XMLHttpRequest 无法加载http://test.testhost.com/testpage.请求头域Access-Control-Allow-Origin 不允许访问控制允许标头.

XMLHttpRequest cannot load http://test.testhost.com/testpage. Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers.

这是标题信息:

> Remote Address:**.**.***.**:80 Request
> URL:http://test.testdomain.com/testpage Request
> Request Method:OPTIONS
> Status Code:200 OK

请求标头:

OPTIONS /content-network HTTP/1.1
Host: test.testhost.com
Connection: keep-alive
Cache-Control: no-cache
Pragma: no-cache
Access-Control-Request-Method: POST
Origin: http://test.testdomain.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.125 Safari/537.36
Access-Control-Request-Headers: access-control-allow-origin, content-type
Accept: */*
Referer: http://test.testdomain.com/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

响应标头:

HTTP/1.1 200 OK
Date: Thu, 14 Aug 2014 20:17:25 GMT
Server: Apache
Last-Modified: Thu, 14 Aug 2014 20:17:25 +0000
Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0
ETag: "1408047445"
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: Content-Type
Vary: Accept-Encoding
Content-Encoding: gzip
Access-Control-Allow-Headers: origin, x-requested-with, content-type
Access-Control-Allow-Methods: PUT, GET, POST, DELETE, OPTIONS
Content-Length: 6117
Connection: close
Content-Type: text/html; charset=utf-8

推荐答案

您的服务器的响应允许请求包含三个特定的 非简单标题:

Your server's response allows the request to include three specific non-simple headers:

Access-Control-Allow-Headers:origin, x-requested-with, content-type

但是您的请求包含服务器响应不允许的标头:

but your request has a header not allowed by the server's response:

Access-Control-Request-Headers:access-control-allow-origin, content-type

在 CORS 请求中发送的所有非简单标头必须由 Access-Control-Allow-Headers 响应标头明确允许.服务器的 CORS 响应不允许在您的请求中发送不必要的 Access-Control-Allow-Origin 标头.这正是...Access-Control-Allow-Headers 不允许"错误消息试图告诉您的内容.

All non-simple headers sent in a CORS request must be explicitly allowed by the Access-Control-Allow-Headers response header. The unnecessary Access-Control-Allow-Origin header sent in your request is not allowed by the server's CORS response. This is exactly what the "...not allowed by Access-Control-Allow-Headers" error message was trying to tell you.

请求没有理由有这个标头:它什么都不做，因为 Access-Control-Allow-Origin 是一个 response 标头，而不是请求标头.

There is no reason for the request to have this header: it does nothing, because Access-Control-Allow-Origin is a response header, not a request header.

解决方案:删除向您的请求添加 Access-Control-Allow-Origin 标头的 setRequestHeader 调用.

Solution: Remove the setRequestHeader call that adds a Access-Control-Allow-Origin header to your request.

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