php常见的header操作
[*]404：
header ("HTTP/1.1 404 Not Found");
[*]301：
header ("HTTP/1.1 301 Moved Permanently");
header ("Location:http://www.baidu.com");
[*]下载文件：
header ('Content-type: application/file');
header ("Content-Disposition: attachment; filename='test.file'");
readfile ("test.file");
[*]允许跨域：
header('Access-Control-Allow-Origin:*');
[*]设置自定义header头：
header('Access-Control-Allow-Headers:WWW-Authenticate,Authorization,Set-Cookie,X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version,name');
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