how to allow cors in javascript

header('Access-Control-Allow-Origin: http://localhost:8100'); header ("Access-Control-Expose-Headers: Content-Length, X-JSON"); header ("Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE, OPTIONS"); header ("Access-Control-Allow-Headers: Content-Type, Authorization, Accept, Accept-Language, X-Authorization"); header('Access-Control-Max-Age: 86400'); if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { // The request is using the POST method header("HTTP/1.1 200 OK"); return; }

//Access to XMLHttpRequest at 'http://localhost/[api path].php' from origin 'http://localhost:4200' has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response. //The error is simply saying that "Content-Type" is missing from "Access-Control-Allow-Headers". //Therefore we need to add "Content-Type" to "Access-Control-Allow-Headers". <?php header('Access-Control-Allow-Headers: Content-Type'); ----- ?>

what is CORS

Use CORS to allow cross-origin access. 
CORS is a part of HTTP that lets servers specify any other hosts 
from which a browser should permit loading of content.

How to block cross-origin access
To prevent cross-origin writes, 
	check an unguessable token in the request — known as a Cross-Site Request Forgery (CSRF) token. 
    prevent cross-origin reads of pages that require this token.
To prevent cross-origin reads of a resource, 
	ensure that it is not embeddable.
    prevent embedding because embedding a resource always leaks some information about it.
To prevent cross-origin embeds, 
	ensure that your resource cannot be interpreted
    Browsers may not respect the Content-Type header. 
For example, if you point a <script> tag at an HTML document, the browser will try to parse the HTML as JavaScript. When your resource is not an entry point to your site, you can also use a CSRF token to prevent embedding.

Posted by: Guest on November-19-2020

Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any other origins (domain, scheme, or port) than its own from which a browser should permit loading of resources. CORS also relies on a mechanism by which browsers make a “preflight” request to the server hosting the cross-origin resource, in order to check that the server will permit the actual request. In that preflight, the browser sends headers that indicate the HTTP method and headers that will be used in the actual request.

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