--- /dev/null
+<?php
+/**
+ * Copyright 2012-2017 Anthon Pang. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package WebDriver
+ *
+ * @author Anthon Pang <apang@softwaredevelopment.ca>
+ */
+
+namespace WebDriver\Service;
+
+/**
+ * WebDriver\Service\CurlServiceInterface class
+ *
+ * @package WebDriver
+ */
+interface CurlServiceInterface
+{
+ /**
+ * Send protocol request to WebDriver server using curl extension API.
+ *
+ * @param string $requestMethod HTTP request method, e.g., 'GET', 'POST', or 'DELETE'
+ * @param string $url Request URL
+ * @param array $parameters If an array(), they will be posted as JSON parameters
+ * If a number or string, "/$params" is appended to url
+ * @param array $extraOptions key=>value pairs of curl options to pass to curl_setopt()
+ *
+ * @return array
+ *
+ * @throws \WebDriver\Exception\CurlExec only if http error and CURLOPT_FAILONERROR has been set in extraOptions
+ */
+ public function execute($requestMethod, $url, $parameters = null, $extraOptions = array());
+}