public function getProxyAuth()
    {
        $proxy_options = $this->getOption(EnumRequestOption::PROXY_OPTIONS, []);
        return isset($proxy_options[EnumProxyOption::PROXY_AUTH]) ? $proxy_options[EnumProxyOption::PROXY_AUTH] : null;
    }
public function getProxyAuth()
    {
        $proxy_options = $this->getOption(EnumRequestOption::PROXY_OPTIONS, []);
        return isset($proxy_options[EnumProxyOption::PROXY_AUTH]) ? $proxy_options[EnumProxyOption::PROXY_AUTH] : null;
    }
public function getProxyAuth ( ) { $ proxy_options = $ this -> getOption ( EnumRequestOption :: PROXY_OPTIONS , [ ] ) ; return isset ( $ proxy_options [ EnumProxyOption :: PROXY_AUTH ] ) ? $ proxy_options [ EnumProxyOption :: PROXY_AUTH ] : null ; }
Returns proxy auth

available values:

'basic' for BASIC auth
null or empty('') for no auth

@return string
Returns proxy auth