Set variable from response header

[ramontiveros]

I want to set a variable (an auth token) that I get in the header of a login request: For example from:

POST http://:server/login

// POST http://example.com/login
// HTTP/1.1 200 OK
// X-Frame-Options: SAMEORIGIN
// X-XSS-Protection: 1; mode=block
// X-Content-Type-Options: nosniff
// X-Download-Options: noopen
// X-Permitted-Cross-Domain-Policies: none
// Referrer-Policy: strict-origin-when-cross-origin
// Content-Type: application/json; charset=utf-8
// Vary: Accept
// Authorization: Bearer XXXXXXXXXXXXXXXXTOKENXXXXXXXXXXXXXXXXXXX
// ETag: W/"f45022010a6c3922806b91360e225e67"
// Cache-Control: max-age=0, private, must-revalidate
// X-Request-Id: 40726d41-3a74-42a9-9461-f3f681f99cb5
// X-Runtime: 0.908726
// Transfer-Encoding: chunked
// Request duration: 0.913235s

I want to extract the Baerer token to set a variable value, but the examples of per-request hooks only cover read data from the result, not the headers. Is this possible?