HTTP API: Replace internals with Requests library.

Requests is a library very similar to WP_HTTP, with a high level of unit test coverage, and has a common lineage and development team. It also supports parallel requests.

See #33055.


git-svn-id: https://develop.svn.wordpress.org/trunk@37428 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/Requests/Proxy.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Proxy connection interface
+ *
+ * @package Requests
+ * @subpackage Proxy
+ * @since 1.6
+ */
+
+/**
+ * Proxy connection interface
+ *
+ * Implement this interface to handle proxy settings and authentication
+ *
+ * Parameters should be passed via the constructor where possible, as this
+ * makes it much easier for users to use your provider.
+ *
+ * @see Requests_Hooks
+ * @package Requests
+ * @subpackage Proxy
+ * @since 1.6
+ */
+interface Requests_Proxy {
+	/**
+	 * Register hooks as needed
+	 *
+	 * This method is called in {@see Requests::request} when the user has set
+	 * an instance as the 'auth' option. Use this callback to register all the
+	 * hooks you'll need.
+	 *
+	 * @see Requests_Hooks::register
+	 * @param Requests_Hooks $hooks Hook system
+	 */
+	public function register(Requests_Hooks &$hooks);
+}