'http' or 'https') and
            returns a ProxyInfo instance per request. By default, uses
            proxy_info_from_environment.
          - a ProxyInfo instance (static proxy config).
          - None (proxy disabled).

        ca_certs is the path of a file containing root CA certificates for SSL
        server certificate validation.  By default, a CA cert file bundled with
        httplib2 is used.

        If disable_ssl_certificate_validation is true, SSL cert validation will
        not be performed.

        tls_maximum_version / tls_minimum_version require Python 3.7+ /
        OpenSSL 1.1.0g+. A value of "TLSv1_3" requires OpenSSL 1.1.1+.
TZ