私有缓存控制的学习笔记：理解Cache-control:private的运用

<?php
// fix 404 pages:   用这个header指令来解决URL重写产生的404 header
header('HTTP/1.1 200 OK'); 

// set 404 header:   页面没找到
header('HTTP/1.1 404 Not Found'); 

// 页面被永久删除，可以告诉搜索引擎更新它们的urls
// set Moved Permanently header (good for redrictions) 
// use with location header 
header('HTTP/1.1 301 Moved Permanently'); 
// 访问受限
header('HTTP/1.1 403 Forbidden');
// 服务器错误
header('HTTP/1.1 500 Internal Server Error');

// 重定向到一个新的位置
// redirect to a new location: 
header('Location: https://www.jb51.net); 

延迟一段时间后重定向
// redrict with delay: 
header('Refresh: 10; url=http://www.sina.com.cn'); 
print 'You will be redirected in 10 seconds'; 

// 覆盖 X-Powered-By value
// override X-Powered-By: PHP: 
header('X-Powered-By: PHP/4.4.0'); 
header('X-Powered-By: Brain/0.6b'); 

// 内容语言 (en = English)
// content language (en = English) 
header('Content-language: en'); 

//最后修改时间 (在缓存的时候可以用到)
// last modified (good for caching) 
$time = time() - 60; // or filemtime($fn), etc 
header('Last-Modified: '.gmdate('D, d M Y H:i:s', $time).' GMT'); 

// 告诉浏览器要获取的内容还没有更新
// header for telling the browser that the content 
// did not get changed 
header('HTTP/1.1 304 Not Modified'); 

// 设置内容的长度 (缓存的时候可以用到):
// set content length (good for caching): 
header('Content-Length: 1234'); 

// 用来下载文件:
// Headers for an download: 
header('Content-Type: application/octet-stream'); 
header('Content-Disposition: attachment; filename="example.zip"'); 
header('Content-Transfer-Encoding: binary'); 

// 禁止缓存当前文档:
// load the file to send:readfile('example.zip'); 
// Disable caching of the current document: 
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate'); 
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');   
// 设置内容类型:
// Date in the pastheader('Pragma: no-cache'); 
// set content type: 
header('Content-Type: text/html; charset=iso-8859-1'); 
header('Content-Type: text/html; charset=utf-8'); 
header('Content-Type: text/plain'); 

// plain text file 
header('Content-Type: image/jpeg');   

// JPG picture 
header('Content-Type: application/zip');   

// ZIP file 
header('Content-Type: application/pdf');   

// PDF file 
header('Content-Type: audio/mpeg');   

// Audio MPEG (MP3,...) file 
header('Content-Type: application/x-shockwave-flash');   

// 显示登录对话框，可以用来进行HTTP认证
// Flash animation// show sign in box 
header('HTTP/1.1 401 Unauthorized'); 
header('WWW-Authenticate: Basic realm="Top Secret"'); 
print 'Text that will be displayed if the user hits cancel or '; 
print 'enters wrong login data';
?>