src/Http.php
public function execute() {
        if ($this->isMulti) {
            return;
        }
        $this->applyMethod();
        $this->responseText = curl_exec($this->curl);
        self::log('HTTP RESPONSE: '.$this->responseText);
        return $this->parseResponse();
    }
public function execute() {
        if ($this->isMulti) {
            return;
        }
        $this->applyMethod();
        $this->responseText = curl_exec($this->curl);
        self::log('HTTP RESPONSE: '.$this->responseText);
        return $this->parseResponse();
    }
EXECUTE AND CLOSE
@return mixed|null
@throws \Exception