I am working locally with react and a nodejs server. I have configured my nodejs server to communicate with react and it works.

From react I want to check if external urls (for example youtube) exist, but the cors error always jumps.

I have tried with axios, XMLHttpRequest, fetch and I have used the header : 'Access-Control-Allow-Origin': '*',

I can remove the cors validation from the browser for testing, but what happens when I upload it to the server?

How can I check if an image, page, video... on an external server exists?

CodePudding user response：

CORS is only applied when you try to do it directly from your browser. Then you can create your own server, create an API endpoint to check if a URL exists, and then, from your react page, you send requests to your API and your API check the page existence. – (by Pipe)