ajax – Nginx CORS不适用于POST

我在我的Nginx中有这个配置

server {
    listen       8080;

add_header    Access-Control-Allow-Origin *;
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'Content-Type';
}

现在我有我的Web应用程序为GET执行GET和POST它工作正常但是如果我执行Ajax POST我得到此错误

XMLHttpRequest cannot load ‘URL’ . Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘Origin’ is therefore not allowed access. The response had HTTP status code 404.

如果我做’GET’请求,我可以在回复中看到这一点.

Access-Control-Allow-Headers:Content-Type
Access-Control-Allow-Methods:GET, POST, OPTIONS
Access-Control-Allow-Origin:*

但如果我发帖,我看不到任何相关内容.

解决方法:

我有同样的问题,通过在我的add_header指令中添加关键字always来解决它.如documentation所述：

add_header: Adds the specified field to a response header provided that the response code equals 200, 201, 204, 206, 301, 302, 303, 304, or 307.
[…]

If the always parameter is specified (1.7.5), the header field will be added regardless of the response code.

发生的事情是,我总是将GET请求返回200并因此获得了预期的标头,而我的POST获得了400,因此没有标头因此触发了CORS错误.