GCP OIDC proxy send request

main.py

global _oidc_token
if not _oidc_token or _oidc_token.is_expired():
    _oidc_token = _get_google_oidc_token()
    logging.info('Renewed OIDC bearer token for {}'.format(
        _adc_credentials.service_account_email))

# Add the Authorization header with the OIDC token.
headers['Authorization'] = 'Bearer {}'.format(_oidc_token)

# We don't want to forward the Host header.
headers.pop('Host', None)
request = Request(proxied_request.method, url,
                  headers=headers,
                  data=proxied_request.data)

# Send the proxied request.
prepped = request.prepare()
logging.info('{} {}'.format(prepped.method, prepped.url))
resp = _session.send(prepped)