s['path'] = $p[0];
		$this->_request_url_fragments['querystring'] =
			( empty( $p[1] ) ? '' : '?' . $p[1] );

		$this->_request_url_fragments = $this->_normalize_url_fragments(
			$this->_request_url_fragments );
	}



	private function _normalize_url_fragments( $fragments ) {
		$fragments = w3tc_apply_filters( 'pagecache_normalize_url_fragments',
			$fragments );
		$fragments['querystring'] = $this->_normalize_querystring(
			$fragments['querystring'] );

		return $fragments;
	}



	private function _normalize_querystring( $querystring ) {
		$ignore_qs = $this->_config->get_array( 'pgcache.accept.qs' );
		$ignore_qs = w3tc_apply_filters( 'pagecache_extract_accept_qs', $ignore_qs );
		Util_Rule::array_trim( $ignore_qs );

		if ( empty( $ignore_qs ) || empty( $querystring ) ) {
			return $querystring;
		}

		$querystring_naked = substr( $querystring, 1 );

		foreach ( $ignore_qs as $qs ) {
			$m = null;
			if ( strpos( $qs, '=' ) === false ) {
				$regexp = Util_Environment::preg_quote( str_replace( '+', ' ', $qs ) );
				if ( @preg_match( "~^(.*?&|)$regexp(=[^&]*)?(&.*|)$~i", $querystring_naked, $m ) ) {
					$querystring_naked = $m[1] . $m[3];
				}
			} else {
				$regexp = Util_Environment::preg_quote( str_replace( '+', ' ', $qs ) );

				if ( @preg_match( "~^(.*?&|)$regexp(&.*|)$~i", $querystring_naked, $m ) ) {
					$querystring_naked = $m[1] . $m[2];
				}
			}
		}

		$querystring_naked = preg_replace( '~[&]+~', '&', $querystring_naked );
		$querystring_naked = trim( $querystring_naked, '&' );

		return empty( $querystring_naked ) ? '' : '?' . $querystring_naked;
	}

	/**
	 *
	 */
	public function delayed_cache_print() {
		if ( $this->_late_caching && $this->_caching ) {
			$this->_cached_data = $this->_extract_cached_page( true );
			if ( $this->_cached_data ) {
				global $w3_late_caching_succeeded;
				$w3_late_caching_succeeded  = true;

				$this->process_status = 'hit';
				$this->process_cached_page_and_exit( $this->_cached_data );
				// if is passes here - exit is not possible now and
				// will happen on init
				return;
			}
		}

		if ( $this->_late_init && $this->_caching ) {
			$this->process_status = 'hit';
			$this->process_cached_page_and_exit( $this->_cached_data );
			// if is passes here - exit is not possible now and
			// will happen on init
			return;
		}
	}

	private function _maybe_save_cached_result( $buffer, $response_headers, $has_dynamic ) {
		$mobile_group = $this->_page_key_extension['useragent'];
		$referrer_group = $this->_page_key_extension['referrer'];
		$encryption = $this->_page_key_extension['encryption'];
		$compression_header = $this->_page_key_extension['compression'];
		$compressions_to_store = $this->_get_compressions();

		/**
		 * Don't compress here for debug mode or dynamic tags
		 * because we need to modify buffer before send it to client
		 */
		if ( $this->_debug || $has_dynamic ) {
			$compressions_to_store = array( false );
		}

		// right now dont return compressed buffer if we are dynamic,
		// that will happen on shutdown after processing dynamic stuff
		$compression_of_returned_content =
			( $has_dynamic ? false : $compression_header );

		$headers = $this->_get_cached_headers( $response_headers['plain'] );
		if ( !empty( $headers['Status-Code'] ) ) {
			$is_404 = ( $headers['Status-Code'] == 404 );
		} elseif ( function_exists( 'is_404' ) ) {
			$is_404 = is_404();
		} else {
			$is_404 = false;
		}

		if ( $this->_enhanced_mode ) {
			// redirect issued, if we have some old cache entries
			// they will be turned into fresh files and catch further requests
			if ( isset( $response_headers['kv']['Location'] ) ) {
				$cache = $this->_get_cache( $this->_page_key_extension['group'] );

				foreach ( $compressions_to_store as $_compression ) {
					$_page_key = $this->_get_page_key(
						array_merge( $this->_page_key_extension,
							array( 'compression' => $_compression ) ) );
					$cache->hard_delete( $_page_key );
				}

				return $buffer;
			}
		}

		$content_type = '';
		if ( $this->_enhanced_mode && !$this->_late_init ) {
			register_shutdown_function( array(
					$this,
					'_check_rules_present'
				) );

			if ( isset( $response_headers['kv']['Content-Type'] ) ) {
				$content_type = $response_headers['kv']['Content-Type'];
			}
		}

		$time = time();
		$cache = $this->_get_cache( $this->_page_key_extension['group'] );

		/**
		 * Store different versions of cache
		 */
		$buffers = array();
		$something_was_set = false;

		foreach ( $compressions_to_store as $_compression ) {
			$this->_set_extract_page_key(
				array_merge( $this->_page_key_extension,
					array(
						'compression' => $_compression,
						'content_type' => $content_type ) ), true );
			if ( empty( $this->_page_key ) )
				continue;

			// Compress content
			$buffers[$_compression] = $this->_compress( $buffer, $_compression );

			// Store cache data
			$_data = array(
				'404' => $is_404,
				'headers' => $headers,
				'time' => $time,
				'content' => $buffers[$_compression]
			);
			if ( !empty( $_compression ) ) {
				$_data['c'] = $_compression;
			}
			if ( $has_dynamic )
				$_data['has_dynamic'] = true;

			$_data = apply_filters( 'w3tc_pagecache_set', $_data, $this->_page_key,
				$this->_page_group );

			if ( !empty( $_data ) ) {
				$cache->set( $this->_page_key, $_data, $this->_lifetime, $this->_page_group );
				$something_was_set = true;
			}
		}

		if ( $something_was_set ) {
			$this->process_status = 'miss_fill';
		} else {
			$this->process_status = 'miss_third_party';
		}

		// Change buffer if using compression
		if ( defined( 'W3TC_PAGECACHE_OUTPUT_COMPRESSION_OFF' ) ) {
			$compression_header = false;
		} elseif ( $compression_of_returned_content &&
			isset( $buffers[$compression_of_returned_content] ) ) {
			$buffer = $buffers[$compression_of_returned_content];
		}

		// Calculate content etag
		$etag = md5( $buffer );

		// Send headers
		$this->_send_headers( $is_404, $time, $etag, $compression_header,
			$headers );
		return $buffer;
	}

	public function w3tc_usage_statistics_of_request( $storage ) {
		global $w3tc_start_microtime;
		$time_ms = 0;
		if ( !empty( $w3tc_start_microtime ) ) {
			$time_ms = (int)( ( microtime( true ) - $w3tc_start_microtime ) * 1000 );
			$storage->counter_add( 'pagecache_requests_time_10ms', (int)( $time_ms / 10 ) );
		}

		if ( !empty( $this->process_status ) ) {
			// see registered keys in PgCache_Plugin.w3tc_usage_statistics_metrics
			$storage->counter_add( 'php_requests_pagecache_' . $this->process_status, 1 );

			if ( $this->_debug ) {
				self::log( 'finished in ' . $time_ms .
					' size ' . $this->output_size .
					' with process status ' .
					$this->process_status .
					' reason ' . $this->cache_reject_reason);
			}
		}
	}

	/**
	 * Log.
	 */
	static protected function log( $msg ) {
		$data = sprintf(
			"[%s] [%s] [%s] %s\n", date( 'r' ),
			isset( $_SERVER['REQUEST_URI'] ) ? filter_var( stripslashes( $_SERVER['REQUEST_URI'] ), FILTER_SANITIZE_URL ) : '',
			! empty( $_SERVER['HTTP_REFERER'] ) ? htmlspecialchars( $_SERVER['HTTP_REFERER'] ) : '-',
			$msg
		);
		$data = strtr( $data, '<>', '..' );

		$filename = Util_Debug::log_filename( 'pagecache' );

		return @file_put_contents( $filename, $data, FILE_APPEND );
	}
}