Fetch GET Request with custom headers ReactJS

Question

I am trying to send a GET request to a API but when i add custom headers in the code somthing strange happens. Somewhere the request method changes to OPTIONS when it reaches th

Answer 1

You probably want to install the cors npm package https://www.npmjs.com/package/cors on the server where you have your http://localhost:8080/api/app Node app running.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS#Preflighted_requests has details about what’s happening here: Your appID and authorizationkey request headers are triggering your browser to send a CORS preflight OPTIONS request before sending the GET.

To handle that OPTIONS request, you can install the cors npm package and follow the instructions at https://www.npmjs.com/package/cors#enabling-cors-pre-flight to configure it:

var express = require('express')
  , cors = require('cors')
  , app = express();
app.options('*', cors()); // include before other routes
app.listen(80, function(){
  console.log('CORS-enabled web server listening on port 80');
});