选项405（方法不允许），无论服务器发送Access-Control-Allow-Methods：OPTIONS，GET，HEAD，POST

问题描述

我正在尝试进行跨域请求，我的服务器配置为发送以下标头：

I'm trying to make cross-domain request and my server is configured to send the following headers:

Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:x-requested-with, Authorization
Access-Control-Allow-Methods:OPTIONS, GET, HEAD, POST
Access-Control-Allow-Origin:*

但是当发出OPTION请求时，我得到 OPTIONS 405（方法不允许）错误。

But when an OPTION request is made, I get OPTIONS 405 (Method Not Allowed) error.

任何想法有什么问题以及如何解决？

Any Ideas what is the problem and how to fix it?

推荐答案

我建议2个解决方案：

1）如果您使用的是WebAPI，那么需要来实现按惯例应该看起来像的方法：

1) If you are using WebAPI you need to implement the option method that by convention should look like:

public class XXXController : ApiController
{
    // OPTION http-verb handler
    public string OptionsXXX()
    {
        return null; // HTTP 200 response with empty body
    }

    ...
}

2）如果您不使用WebAPI尝试了解代码的哪一部分触发选项405（方法不允许）错误。在这种情况下，我会检查是否尝试添加到 Web.config 文件这些< customHeaders /> 有效：

2) If you are not using WebAPI try to understand which part of your code triggers the OPTIONS 405 (Method Not Allowed) error for the OPTION call. In that case I would check if trying to add to the Web.config file these <customHeaders/> that works:

<configuration>
  <system.webServer>
    <httpProtocol>
      <customHeaders>
        <!-- CORS temporary solution -->
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Content-Type, Authorization, Accept, X-Requested-With" />
        <add name="Access-Control-Allow-Methods" value="OPTIONS, TRACE, GET, HEAD, POST, PUT" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
</configuration>

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