what is cors
CORS => (Cross-Origin Resource Sharing)
sharing resources between different sourceswhat is cors
CORS => (Cross-Origin Resource Sharing)
sharing resources between different sourcesAccess 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
“CORS” stands for Cross-Origin Resource Sharing.
It allows you to make requests from one website to another website
in the browser, which is normally prohibited by another browser policy
called the Same-Origin Policy (SOP).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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