WP_HTTP_Proxy::send_through_proxy( string $uri )

Whether URL should be sent through the proxy server.


Description

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.


Parameters

$uri

(Required) URI to check.


Return

(bool) True, to send through the proxy and false if, the proxy should not be used.


Source

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

	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 WP-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 );
	}


Changelog

Changelog
Version Description
WP-2.8.0 Introduced.