CORS

CORS (跨域资源共享)是一个系统, 包括传输的 HTTP headers, 其确定是否阻止或完成从该资源所在的域外的另一个域的网页上的受限资源的请求,。

同源安全策略( same-origin security policy)默认禁止“跨域”请求. CORS 给予Web服务器跨域访问控制, 启用安全的跨域数据传输。。.

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General knowledge

CORS headers

Access-Control-Allow-Origin
Indicates whether the response can be shared.
Access-Control-Allow-Credentials
Indicates whether or not the response to the request can be exposed when the credentials flag is true.
Access-Control-Allow-Headers
Used in response to a preflight request to indicate which HTTP headers can be used when making the actual request.
Access-Control-Allow-Methods
Specifies the method or methods allowed when accessing the resource in response to a preflight request.
Access-Control-Expose-Headers
Indicates which headers can be exposed as part of the response by listing their names.
Access-Control-Max-Age
Indicates how long the results of a preflight request can be cached.
Access-Control-Request-Headers
Used when issuing a preflight request to let the server know which HTTP headers will be used when the actual request is made.
Access-Control-Request-Method
Used when issuing a preflight request to let the server know which HTTP method will be used when the actual request is made.
Origin
Indicates where a fetch originates from.

Technical reference

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