Python code to capture outgoing header to be re-used for scraping

Intercept_header.py

# Some flaw in python code due to which things are intercepted only after clicking twice / two requests
def get_intercepted_header(page):
    global intercepted_header
    global intercepted_auth_token
    # URL that is called in the request
    page.route("**/customeraccounts", handle)
    # Click the link which sends out a request
    page.get_by_text("Check Balance").click()

# page.route("**/*", handle)
def handle(route, request):
    # override headers
    print('Intercepted ' + request.url)
    if 'customeraccounts' in request.url:
        global intercepted_header
        global intercepted_auth_token
        intercepted_auth_token = request.headers['authorization']
        intercepted_header = request.headers
    route.continue_()