WP_HTTP_Proxy

Core class used to implement HTTP API proxy support.


Description Description

There are caveats to proxy support. It requires that defines be made in the wp-config.php file to enable proxy support. There are also a few filters that plugins can hook into for some of the constants.

Please note that only BASIC authentication is supported by most transports. cURL MAY support more methods (such as NTLM authentication) depending on your environment.

The constants are as follows:

  1. WP_PROXY_HOST – Enable proxy support and host for connecting.
  2. WP_PROXY_PORT – Proxy port for connection. No default, must be defined.
  3. WP_PROXY_USERNAME – Proxy username, if it requires authentication.
  4. WP_PROXY_PASSWORD – Proxy password, if it requires authentication.
  5. WP_PROXY_BYPASS_HOSTS – Will prevent the hosts in this list from going through the proxy. You do not need to have localhost and the site host in this list, because they will not be passed through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org

An example can be as seen below.

define('WP_PROXY_HOST', '192.168.84.101');
define('WP_PROXY_PORT', '8080');
define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org');

Source Source

File: wp-includes/class-wp-http-proxy.php

class WP_HTTP_Proxy {

	/**
	 * Whether proxy connection should be used.
	 *
	 * @since 2.8.0
	 *
	 * @use WP_PROXY_HOST
	 * @use WP_PROXY_PORT
	 *
	 * @return bool
	 */
	public function is_enabled() {
		return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT');
	}

	/**
	 * Whether authentication should be used.
	 *
	 * @since 2.8.0
	 *
	 * @use WP_PROXY_USERNAME
	 * @use WP_PROXY_PASSWORD
	 *
	 * @return bool
	 */
	public function use_authentication() {
		return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD');
	}

	/**
	 * Retrieve the host for the proxy server.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function host() {
		if ( defined('WP_PROXY_HOST') )
			return WP_PROXY_HOST;

		return '';
	}

	/**
	 * Retrieve the port for the proxy server.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function port() {
		if ( defined('WP_PROXY_PORT') )
			return WP_PROXY_PORT;

		return '';
	}

	/**
	 * Retrieve the username for proxy authentication.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function username() {
		if ( defined('WP_PROXY_USERNAME') )
			return WP_PROXY_USERNAME;

		return '';
	}

	/**
	 * Retrieve the password for proxy authentication.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function password() {
		if ( defined('WP_PROXY_PASSWORD') )
			return WP_PROXY_PASSWORD;

		return '';
	}

	/**
	 * Retrieve authentication string for proxy authentication.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function authentication() {
		return $this->username() . ':' . $this->password();
	}

	/**
	 * Retrieve header string for proxy authentication.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function authentication_header() {
		return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );
	}

	/**
	 * Whether URL should be sent through the proxy server.
	 *
	 * We want to keep localhost and the site URL from being sent through the proxy server, because
	 * some proxies can not handle this. We also have the constant available for defining other
	 * hosts that won't be sent through the proxy.
	 *
	 * @since 2.8.0
	 *
	 * @staticvar array|null $bypass_hosts
	 * @staticvar array      $wildcard_regex
	 *
	 * @param string $uri URI to check.
	 * @return bool True, to send through the proxy and false if, the proxy should not be used.
	 */
	public function send_through_proxy( $uri ) {
		/*
		 * parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
		 * This will be displayed on sites, which is not reasonable.
		 */
		$check = @parse_url($uri);

		// Malformed URL, can not process, but this could mean ssl, so let through anyway.
		if ( $check === false )
			return true;

		$home = parse_url( get_option('siteurl') );

		/**
		 * Filters whether to preempt sending the request through the proxy server.
		 *
		 * Returning false will bypass the proxy; returning true will send
		 * the request through the proxy. Returning null bypasses the filter.
		 *
		 * @since 3.5.0
		 *
		 * @param null   $override Whether to override the request result. Default null.
		 * @param string $uri      URL to check.
		 * @param array  $check    Associative array result of parsing the URI.
		 * @param array  $home     Associative array result of parsing the site URL.
		 */
		$result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home );
		if ( ! is_null( $result ) )
			return $result;

		if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) )
			return false;

		if ( !defined('WP_PROXY_BYPASS_HOSTS') )
			return true;

		static $bypass_hosts = null;
		static $wildcard_regex = array();
		if ( null === $bypass_hosts ) {
			$bypass_hosts = preg_split('|,\s*|', WP_PROXY_BYPASS_HOSTS);

			if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) {
				$wildcard_regex = array();
				foreach ( $bypass_hosts as $host )
					$wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
				$wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';
			}
		}

		if ( !empty($wildcard_regex) )
			return !preg_match($wildcard_regex, $check['host']);
		else
			return !in_array( $check['host'], $bypass_hosts );
	}
}

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Version Description
2.8.0 Introduced.

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