Android socket & HTTP response headers

问题

The funny thing is: I may have accidentally found the solution for Is it possible to send HTTP request using plain socket connection and receive response without headers?. I hope I'm overlooking something.

Anyway, I'm connecting to a web server, send a HTTP request, receive the response and close the connection. The actual HTTP conversation (tcpdump on the server side) looks like this:

GET /blah.php?param1=test1t&param2=test2 HTTP/1.0

HTTP/1.1 200 OK
Date: Sat, 22 Sep 2012 10:16:46 GMT
Server: Apache/2.2.17 (Ubuntu)
X-Powered-By: PHP/5.3.5-1ubuntu7.8
Vary: Accept-Encoding
Content-Length: 17
Connection: close
Content-Type: text/html

<pre>173364</pre>

Cool. It works... so far. Now this is the code. The string szRetval contains only "<pre>173364</pre>".

Socket s = new Socket("1.2.3.4", 80);
//DataInputStream in = new DataInputStream(s.getInputStream());
BufferedReader bin = new BufferedReader(new InputStreamReader(s.getInputStream()));
DataOutputStream out = new DataOutputStream(s.getOutputStream());

out.writeBytes(szRequest);
String szRetval = "";
String szLine = "";
while((szLine=bin.readLine())!=null) {
    szRetval += szLine;
}
s.close();
return szRetval;

As you can see from the code sample, I've already switched from DataInputStream to BufferedReader. It makes no difference, so I guess this has to do with the Socket class itself.

Why o why are the http response headers not returned by a (raw) socket??

Android 2.3.3, Network I/O in AsyncTask, not using proxy.

来源：https://stackoverflow.com/questions/12648551/android-socket-http-response-headers