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javascript - 预检响应中的 Access-Control-Allow-Headers 不允许 XMLHttpRequest 请求标头字段 postman-token

问题描述

我正在尝试访问 smartthings API 以在本地控制设备。当我使用以下 chrome 扩展程序时，它可以工作，但是我不想依赖这样的东西：https ://chrome.google.com/webstore/detail/allow-cors-access-control/lhobafahddgcelffkeicbaginigeejlf?hl=en

不使用扩展程序时出现以下错误：

Access to XMLHttpRequest at 'https://api.smartthings.com/v1/devices/XXXX-
XXXX-XXXX/commands'from origin 'http://localhost:8080' has been blocked by 
CORS policy: Request header field postman-token is not 
allowed by Access-Control-Allow-Headers in preflight response.

我一直试图理解 CORS 以及为什么我被“拒绝”可以这么说，但我感到困惑的是我的响应/请求标头似乎是正确的。以下是请求和响应标头：

GENERAL
Request URL: https://api.smartthings.com/v1/devices/XXXX-XXXX-XXXX/commands
Request Method: OPTIONS
Status Code: 204 No Content
Remote Address: 1x.xxx.1xx.xx:xxx
Referrer Policy: no-referrer-when-downgrade

RESPONSE HEADERS
Access-Control-Allow-Headers: DNT,Keep-Alive,User-Agent,If-Modified-Since,Cache-Control,Content-Type,Accept,Authorization,X-ST-Client,X-ST-Api-Version,X-ST-Client-AppVersion,X-ST-Client-OS,X-ST-Client-DeviceModel
Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Origin: *
Access-Control-Max-Age: 1728000
Connection: keep-alive
Content-Length: 0
Content-Type: text/plain charset=UTF-8
Date: Tue, 06 Aug 2019 16:19:52 GMT
Server: openresty

REQUEST HEADERS
Provisional headers are shown
Access-Control-Request-Headers: authorization,cache-control,content-type,postman-token
Access-Control-Request-Method: POST
Origin: http://localhost:8080
Referer: http://localhost:8080/compare/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/xxx.xx (KHTML, like Gecko) Chrome/xx.x.xxxx.xxx Safari/xxx.xx

我对此的困惑是 smartthings 响应似乎允许 *，这让我认为我不应该收到这个错误。但是，我对如何从头到尾编辑/调整这些标题有点困惑，基本上我想做任何 chrome 扩展正在做的事情？以下是我调用 smartthings API 的方式：

function APIAWAY(){

    var settings = {
      "async": true,
      "crossDomain": true,
      "url": "https://api.smartthings.com/v1/devices/XXX-XXXX/commands",
      "method": "POST",
      "headers": {
        "Authorization": "Bearer XXXX-XXXX-XXXX",
        "Content-Type": "application/json",
        "Accept": "*/*",
        "Cache-Control": "no-cache",
        "Postman-Token": "XXXX-XXXX-XXXX",
        "cache-control": "no-cache"
      },
      "processData": false,
      "data": "{\r\n\"commands\": [\r\n{\r\n\"component\": \"main\",\r\n\"capability\": \"switch\",\r\n\"command\": \"on\"\r\n}\r\n]\r\n}"
    }

    $.ajax(settings).done(function (response) {
      console.log(response);
    });     
}

标签： javascriptjqueryresthttpcors

解决方案

做这个 -

function APIAWAY(){
 var settings = {
          "async": true,
          "crossDomain": true,
          "url": "https://api.smartthings.com/v1/devices/XXX-XXXX/commands",
          "method": "POST",
          "headers": {
            "Authorization": "Bearer XXXX-XXXX-XXXX",
            "Content-Type": "application/json",
            "Accept": "*/*",
            "Cache-Control": "no-cache",
            "cache-control": "no-cache"
          },
          "processData": false,
          "data": "{\r\n\"commands\": [\r\n{\r\n\"component\": \"main\",\r\n\"capability\": \"switch\",\r\n\"command\": \"on\"\r\n}\r\n]\r\n}"
        }

        $.ajax(settings).done(function (response) {
          console.log(response);
        });     
    }

问题是您正在添加Postman-Token服务器不接受的标头。

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