src/Neutrino/HttpClient/Provider/Curl.php
protected function buildProxy()
    {
        if (isset($this->proxy['host'])) {
            $this
                ->setOption(CURLOPT_PROXY, $this->proxy['host'])
                ->setOption(CURLOPT_PROXYPORT, $this->proxy['port']);

            if (isset($this->proxy['access'])) {
                $this->setOption(CURLOPT_PROXYUSERPWD, $this->proxy['access']);
            }
        }

        return $this;
    }
protected function buildProxy()
    {
        if (isset($this->proxy['host'])) {
            $this
                ->setOption(CURLOPT_PROXY, $this->proxy['host'])
                ->setOption(CURLOPT_PROXYPORT, $this->proxy['port']);

            if (isset($this->proxy['access'])) {
                $this->setOption(CURLOPT_PROXYUSERPWD, $this->proxy['access']);
            }
        }

        return $this;
    }
Build proxy

@return $this