I'm trying to save the token that my server sends on every request. Although apparently "Authorization" is present in the response, I can not print the value.
The code is:
Whatisreturnedfromtheserver: 
WhatIcanprinttotheconsole: 
OntheserverI'musingamiddlewareforcors 
How do I get the token that is coming into Header Authorization?
Solved. I inserted some more options into the file that generates the final response on the server and it worked. I followed the suggestion of link
it looks like you did not expose the header correctly, the browser will not forward this header to your code unless you specify it server side.
try adding this to you $ headers object
$response->headers->set('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT, DELETE');
$response->headers->set('Access-Control-Allow-Headers', 'Content-Type, X-Auth-Token, Origin, Authorization');
$response->headers->set('Access-Control-Expose-Headers', 'Authorization');
$response->headers->set('Authorization', 'Bearer ' . $newToken);
return $response;