And this proxy can return the Access-Control-Allow-Origin header if it’s not at the Same Origin as your page. If you can’t modify the server, you can run your own proxy. Modify the server to add the header Access-Control-Allow-Origin: * to enable cross-origin requests from anywhere (or specify a domain instead of *). if you’re using an external API), this approach won’t work. Here are a few ways to solve this problem: Best: CORS header (requires server changes)ĬORS (Cross-Origin Resource Sharing) is a way for the server to say “I will accept your request, even though you came from a different origin.” This requires cooperation from the server – so if you can’t modify the server (e.g. It afflicts all web apps equally, and most of the fixes we’ll look at below are actually modifying the server or the browser. To be clear, this is not an Angular error. Requesting over http from https or vice-versa (requesting from ).
Hitting a different port on the same host (webapp is on API is.Hitting an internal API (a request from to ).Hitting an external API (a request from to ).Hitting a server from a locally-served file (a request from file:///YourApp/index.html to ).You’ve run afoul of the Same Origin Policy – it says that every AJAX request must match the exact host, protocol, and port of your site. No ‘Access-Control-Allow-Origin’ header is present on the requested resource. (Or: read this other post if you’re having trouble with CORS errors in React or Express)
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