Basic realm string editable in config file

Is it possible to change Basic realm, default=Tinyproxy
to something else using configuration file?

WORKAROUND.... to set a fixed string "MY_SECRET_SERVER"
html-error.c  line 169:
        const char auth_str[] =
            "Proxy-Authenticate: Basic realm=\""
           "MY_SECRET_SERVER" "\"\r\n";

Thank you.