Questions about using file () to read URLs

 $buffer = file("http://www.sina.com.cn");  for($i=0;$i
  
   < code="">

读取新浪没问题，
但是读163的话，就提示：
因为您的ISP供应商并没有遵循标准的互联网协议，我们对您的访问作出限制，敬请谅解。 您可以通过以下链接继续访问 www.163.com
而读取豆瓣，就报warning:
Warning: file(http://www.douban.com) [function.file]: failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in C:\wamp\www\1\1.php on line 25
读搜狐就全是乱码
这是怎么回事？

Reply content:

 $buffer = file("http://www.sina.com.cn");  for($i=0;$i
  
    < code="">

读取新浪没问题，
但是读163的话，就提示：
因为您的ISP供应商并没有遵循标准的互联网协议，我们对您的访问作出限制，敬请谅解。 您可以通过以下链接继续访问 www.163.com
而读取豆瓣，就报warning:
Warning: file(http://www.douban.com) [function.file]: failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in C:\wamp\www\1\1.php on line 25
读搜狐就全是乱码
这是怎么回事？

fileHTTP requests that are made using PHP functions are like this

GET / HTTP/1.0HOST: www.douban.com

And that's what the browser is sending.

GET / HTTP/1.1Host: www.douban.comConnection: keep-aliveAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8User-Agent: xxxxxxxxxxxxxxxxxxAccept-Encoding: gzip, deflate, sdchAccept-Language: zh-CN,zh;q=0.8,en;q=0.6

Can the Lord understand it (focusing on the difference in the first line)?

If you still don't understand, please keep looking.

However, if you read 163, you will be advised that your ISP provider is not complying with the standard Internet Protocol and we have limited access to your website. You can continue to access the following links
Www.163.com

163 does not support the HTTP/1.0 protocol, but its server is configured to accept http/1.0 requests, when you use the HTTP 1.0 protocol access, will be 302 jump to Http://www.163.com/special/0077jt/error_ Isp.html, which is the error page that displays the above text

And read the Watercress, reported Warning:Warning:file (http://www.douban.com) [function.file]:
Failed to open Stream:http request failed! http/1.1 403 Forbidden in
C:\wamp\www\1\1.php on line 25

Similarly, watercress does not support http/1.0, treats http/1.0 requests more violently, directly rejects (403) because its server is not configured to enable HTTP1.0

Read Sohu is all garbled

Because Sohu's home page, is the default gzip compression

