Preflight request

Preflight request

A CORS preflight request is a CORS request that checks to see if the CORS protocol is understood.

It is an OPTIONS request, using three HTTP request headers: Access-Control-Request-MethodAccess-Control-Request-Headers, and the Origin header.

A preflight request is automatically issued by a browser, when needed. In normal cases, front-end developers don't need to craft such requests themselves.

For example, a client might be asking a server if it would allow a DELETE request, before sending a DELETE request, by using a preflight request:

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