POST 选项后未调用方法

Question

我正在尝试从 angularjs 应用程序

中调用 API

var url = "...";
var myObject = {...};
var config = {
    headers : {
        'Content-Type': 'application/json;charset=utf-8;'
    }
};
$http.post(url, myObject, config).then(function(result){...});

因为它是一个 cross-origin 请求，它会进行预检，所以它会调用 OPTIONS 方法。这是请求 header:

Host: ...
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: pt-BR
Accept-Encoding: gzip, deflate
Access-Control-Request-Method: POST
Access-Control-Request-Headers: content-type
Referer: http://localhost:9000/....
Origin: http://localhost:9000
DNT: 1
Connection: keep-alive

它 returns 为 200 OK，响应 header:

{
    Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
    Access-Control-Allow-Origin: *
    Cache-Control: no-store, no-cache, must-revalidate
    Content-Length: 0
    Content-Type: text/html; charset=utf-8
    Date: Fri, 01 Nov 2019 14:31:29 GMT
    Expires: Thu, 19 Nov 1981 08:52:00 GMT
    Pragma: no-cache
    Server: Microsoft-IIS/10.0
    Vary: X-Requested-With
    X-Frame-Options: GOFORIT
    X-Powered-By: Nette Framework, ASP.NET
}

但之后它不会执行 POST 调用。我尝试通过 POSTMAN 直接调用 POST 方法，它返回得很好。有什么我想念的吗？

编辑：这是控制台错误：

Possibly unhandled rejection: 
{
    "data":null,
    "status":-1,
    "config":{
        "method":"POST",
        "transformRequest":[null],
        "transformResponse":[null],
        "jsonpCallbackParam":"callback",
        "headers":{
            "Content-Type":"application/json;charset=utf-8;",
            "Accept":"application/json, text/plain, */*"
         },
        "url":"...",
        "data":{...},
        "cached":false
    },
    "statusText":"",
    "xhrStatus":"error"
}

Answer 1

OPTIONS 请求设置了这些 header：

Access-Control-Request-Method: POST
Access-Control-Request-Headers: content-type

所以它询问是否可以执行 POST 请求，包括 "content-type" header。

服务器响应：

Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Origin: *

但它缺少“Access-Control-Allow-Headers”响应 header:

Access-Control-Allow-Headers: content-type

将此添加到 OPTIONS 响应中，您应该没问题。

可能，控制台报错信息为

Reason: missing token ‘content-type’ in CORS header ‘Access-Control-Allow-Headers’ from CORS preflight channel*

即self-explanatory。

Answer 2

像这样将额外的 header 添加到您的 web.config...

<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="*" />
    <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
    <add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept" />
  </customHeaders>
</httpProtocol>

POST 选项后未调用方法

POST method not being called after OPTIONS

same-origin-policy

cors

asp.net-web-api

angularjs