Angular 2打字稿-启用CORS标头'Access-Control-Allow-Origin'

Question

I have Angular 2 typescript application running on my localhost. I have to access external REST API in my application. Whenever I try to access, I get this error

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at ***. (Reason: CORS header 'Access-Control-Allow-Origin' missing).

What is the best solution to fix this issue. I dont want to use any plugin/addOns. I dont think so this package would work for Angular 2 Typescript application.It is used for express.js

npm install cors --save 

How do I set this CORS header 'Access-Control-Allow-Origin' using typescript for entire project/application? Where do I need to add this header in below code?

var request = new XMLHttpRequest();
   let myurl='http://remoteIP/api';
request.open('GET', myurl, true);
request.responseType = 'blob';
request.onload = function() {
    var reader = new FileReader();
    reader.readAsDataURL(request.response);
    reader.onload = (e) => {
        console.log('DataURL:', reader.result);
    };
};
request.send();

Answer 1

The server that hosts that API needs to enable CORS. This is a limitation of client-side languages - they make these REST requests through the browser. The browser will change whatever mocked origin headers you give it to your actual website's headers.

This isn't an issue with server-side languages, such as PHP or even nodeJS/expressJS.