enabling cors in codeigniter ( restserver by @chriskacerguis )

by

Try adding OPTIONS to the allowed methods.

header("Access-Control-Allow-Methods: GET, OPTIONS");
header("Access-Control-Allow-Headers: Content-Type, Content-Length, Accept-Encoding");

and return immediately when the request is method ‘OPTIONS’ once you have set the headers.

if ( "OPTIONS" === $_SERVER['REQUEST_METHOD'] ) {
    die();
}

See also this answer.

Angular sends a W3C CORS spec compliant preflight request that will check for the right allowed methods before actually attempting it.

Personally, I find the Mozilla Developer Network CORS page a bit easier to read on the matter to help understand the flow of CORS.

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