allow cross origin
Access-Control-Allow-Origin: *
Access-Control-Allow-Origin: <origin>
Access-Control-Allow-Origin: nullallow cross origin
Access-Control-Allow-Origin: *
Access-Control-Allow-Origin: <origin>
Access-Control-Allow-Origin: nullcross origin even with allow header
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/MySQL_pracs/InsertUser.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.
//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.Copyright © 2021 Codeinu
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