http.php

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    }

    /**
     * Returns the domain or host IP portion of the URL, or FALSE if none.
     *
     * @return string
     */
    public function getHost()
    {
        return strlen($this->_host) ? $this->_host : false;
    }

    /**
     * Returns true if and only if the host string passes validation. If no host is passed,
     * then the host contained in the instance variable is used.
     *
     * @param string $host
     * @return boolean
     * @uses Zend_Filter
     */
    public function validateHost($host = null)
    {
        if ($host === null) {
            $host = $this->_host;
        }

        /**
         * If the host is empty, then it is considered invalid
         */
        if (strlen($host) == 0) {
            return false;
        }

        /**
         * Check the host against the allowed values; delegated to Zend_Filter.
         */
        $validate = new Zend_Validate_Hostname(Zend_Validate_Hostname::ALLOW_ALL);
        return $validate->isValid($host);
    }

    /**
     * Sets the host for the current URI, and returns the old host
     *
     * @param string $host
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setHost($host)
    {
        if (!$this->validateHost($host)) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception("Host \"$host\" is not a valid HTTP host");
        }
        $oldHost = $this->_host;
        $this->_host = $host;
        return $oldHost;
    }

    /**
     * Returns the TCP port, or FALSE if none.
     *
     * @return string
     */
    public function getPort()
    {
        return strlen($this->_port) ? $this->_port : false;
    }

    /**
     * Returns true if and only if the TCP port string passes validation. If no port is passed,
     * then the port contained in the instance variable is used.
     *
     * @param string $port
     * @return boolean
     */
    public function validatePort($port = null)
    {
        if ($port === null) {
            $port = $this->_port;
        }

        // If the port is empty, then it is considered valid
        if (!strlen($port)) {
            return true;
        }

        // Check the port against the allowed values
        return ctype_digit((string)$port) && 1 <= $port && $port <= 65535;
    }

    /**
     * Sets the port for the current URI, and returns the old port
     *
     * @param string $port
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setPort($port)
    {
        if (!$this->validatePort($port)) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception("Port \"$port\" is not a valid HTTP port.");
        }
        $oldPort = $this->_port;
        $this->_port = $port;
        return $oldPort;
    }

    /**
     * Returns the path and filename portion of the URL, or FALSE if none.
     *
     * @return string
     */
    public function getPath()
    {
        return strlen($this->_path) ? $this->_path : '/';
    }

    /**
     * Returns true if and only if the path string passes validation. If no path is passed,
     * then the path contained in the instance variable is used.
     *
     * @param string $path
     * @throws Zend_Uri_Exception
     * @return boolean
     */
    public function validatePath($path = null)
    {
        if ($path === null) {
            $path = $this->_path;
        }
        /**
         * If the path is empty, then it is considered valid
         */
        if (strlen($path) == 0) {
            return true;
        }
        /**
         * Determine whether the path is well-formed
         */
        $pattern = '/^' . $this->_regex['path'] . '$/';
        $status = @preg_match($pattern, $path);
        if ($status === false) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception('Internal error: path validation failed');
        }
        return (boolean) $status;
    }

    /**
     * Sets the path for the current URI, and returns the old path
     *
     * @param string $path
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setPath($path)
    {
        if (!$this->validatePath($path)) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception("Path \"$path\" is not a valid HTTP path");
        }
        $oldPath = $this->_path;
        $this->_path = $path;
        return $oldPath;
    }

    /**
     * Returns the query portion of the URL (after ?), or FALSE if none.
     *
     * @return string
     */
    public function getQuery()
    {
        return strlen($this->_query) ? $this->_query : false;
    }

    /**
     * Returns true if and only if the query string passes validation. If no query is passed,
     * then the query string contained in the instance variable is used.
     *
     * @param string $query
     * @throws Zend_Uri_Exception
     * @return boolean
     */
    public function validateQuery($query = null)
    {
        if ($query === null) {
            $query = $this->_query;
        }

        // If query is empty, it is considered to be valid
        if (strlen($query) == 0) {
            return true;
        }

        /**
         * Determine whether the query is well-formed
         *
         * @link http://www.faqs.org/rfcs/rfc2396.html
         */
        $pattern = '/^' . $this->_regex['uric'] . '*$/';
        $status = @preg_match($pattern, $query);
        if ($status === false) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception('Internal error: query validation failed');
        }

        return $status == 1;
    }

    /**
     * Set the query string for the current URI, and return the old query
     * string This method accepts both strings and arrays.
     *
     * @param  string|array $query The query string or array
     * @return string              Old query string
     */
    public function setQuery($query)
    {
        $oldQuery = $this->_query;
        
        // If query is empty, set an empty string
        if (empty($query)) {
            $this->_query = '';
            return $oldQuery;
        }

        // If query is an array, make a string out of it
        if (is_array($query)) {
            $query = http_build_query($query, '', '&');
        
        // If it is a string, make sure it is valid. If not parse and encode it
        } else {
            $query = (string) $query;
            if (! $this->validateQuery($query)) {
                parse_str($query, $query_array);
                $query = http_build_query($query_array, '', '&');   
            }
        }

        // Make sure the query is valid, and set it
        if (! $this->validateQuery($query)) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception("'$query' is not a valid query string");
        }
        
        $this->_query = $query;
        
        return $oldQuery;
    }

    /**
     * Returns the fragment portion of the URL (after #), or FALSE if none.
     *
     * @return string|false
     */
    public function getFragment()
    {
        return strlen($this->_fragment) ? $this->_fragment : false;
    }

    /**
     * Returns true if and only if the fragment passes validation. If no fragment is passed,
     * then the fragment contained in the instance variable is used.
     *
     * @param string $fragment
     * @throws Zend_Uri_Exception
     * @return boolean
     */
    public function validateFragment($fragment = null)
    {
        if ($fragment === null) {
            $fragment = $this->_fragment;
        }

        // If fragment is empty, it is considered to be valid
        if (strlen($fragment) == 0) {
            return true;
        }

        /**
         * Determine whether the fragment is well-formed
         *
         * @link http://www.faqs.org/rfcs/rfc2396.html
         */
        $pattern = '/^' . $this->_regex['uric'] . '*$/';
        $status = @preg_match($pattern, $fragment);
        if ($status === false) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception('Internal error: fragment validation failed');
        }

        return (boolean) $status;
    }

    /**
     * Sets the fragment for the current URI, and returns the old fragment
     *
     * @param string $fragment
     * @throws Zend_Uri_Exception
     * @return string
     */
    public function setFragment($fragment)
    {
        if (!$this->validateFragment($fragment)) {
	    require_once 'Zend/Uri/Exception.php';
            throw new Zend_Uri_Exception("Fragment \"$fragment\" is not a valid HTTP fragment");
        }
        $oldFragment = $this->_fragment;
        $this->_fragment = $fragment;
        return $oldFragment;
    }
}