HTTP headers for CORS explained.
A thread π§΅π
A thread π§΅π
Let's start with HTTP request headers:
π Origin
The browser adds this header to CORS requests to indicate the origin domain.
π Origin
The browser adds this header to CORS requests to indicate the origin domain.
π Access-Control-Request-Method
Specific CORS requests that affect user data will initiate with a preflight request. This header is added to the preflight to indicate the method used in the main request. For example:
Access-Control-Request-Method: PUT
Specific CORS requests that affect user data will initiate with a preflight request. This header is added to the preflight to indicate the method used in the main request. For example:
Access-Control-Request-Method: PUT
π Access-Control-Request-Headers
This header is used when issuing a preflight request.
It is sent by the browser and defines the different HTTP headers the actual request might contain.
The server answers in a corresponding βAccess-Control-Allow-Headersβ response header.
This header is used when issuing a preflight request.
It is sent by the browser and defines the different HTTP headers the actual request might contain.
The server answers in a corresponding βAccess-Control-Allow-Headersβ response header.
Now let's move on to HTTP response headers:
π Access-Control-Allow-Origin
This header defines the domain from which requests are accepted. If the value for this header is an asterisk(*), it indicates requests from any domain are accepted.
π Access-Control-Allow-Origin
This header defines the domain from which requests are accepted. If the value for this header is an asterisk(*), it indicates requests from any domain are accepted.
π Access-Control-Allow-Credentials
This header is used in preflight requests to indicate whether a request can be made with credentials (cookies, TLS client certificates, or authorization headers). Its only valid value is βtrue.β
This header is used in preflight requests to indicate whether a request can be made with credentials (cookies, TLS client certificates, or authorization headers). Its only valid value is βtrue.β
π Access-Control-Max-Age
This header is used to state how long the results of a preflight request can be cached in seconds.
This header is used to state how long the results of a preflight request can be cached in seconds.
π Access-Control-Allow-Methods
This method defines one or more methods allowed to access the cross-origin resource and is sent in response to a preflight request. For example:
Access-Control-Allow-Methods: POST, OPTIONS
This method defines one or more methods allowed to access the cross-origin resource and is sent in response to a preflight request. For example:
Access-Control-Allow-Methods: POST, OPTIONS
π Access-Control-Allow-Headers
Used in response to a preflight request that contains βAccess-Control-Request-Headers.β It indicates which HTTP headers can be used in the actual request.
Used in response to a preflight request that contains βAccess-Control-Request-Headers.β It indicates which HTTP headers can be used in the actual request.
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