How to enable Access-Control-Allow-Origin for angular 5/nodejs?

Question

Read many ways for including of \'Access-Control-Allow-Origin\' and none worked for me.

I use @angular/common/http module and external url as data source. by the att

Answer 1

**Set headers to allow CORS origin in Express **

=> Add code in the server.js file or mail file.

app.use(function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
 });

CORS (Cross-Origin Resource Sharing) is an HTML5 feature that allows one site to access another site’s resources despite being under different domain names.

The W3C specification for CORS actually does a pretty good job of providing some simple examples of the response headers, such as the key header, Access-Control-Allow-Origin, and other headers that you must use to enable CORS on your web server.