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Editorial Team
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Asked: 2026-06-02T13:39:28+00:00

I am trying to make an HTTPClient connection using sockets and can’t figure it

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I am trying to make an HTTPClient connection using sockets and can’t figure it out. When I run the code, I get the following message;

HTTP/1.1 400 Bad Request
Date: Sun, 22 Apr 2012 13:17:12 GMT
Server: Apache/2.2.16 (Debian)
Vary: Accept-Encoding
Content-Length: 317
Connection: close
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
<hr>
<address>Apache/2.2.16 (Debian) Server at pvs.ifi.uni-heidelberg.de Port 80</address>
</body></html>

The code is here:

import java.net.*;
import java.io.*;

public class a1 {
  public static void main ( String[] args ) throws IOException {
    Socket s = null;

    try {
        String host = "host1";
        String file = "file1";
        int port = 80;

Here I am creating the socket:

         s = new Socket(host, port);

        OutputStream out = s.getOutputStream();
        PrintWriter outw = new PrintWriter(out, false);
        outw.print("GET " + file + " HTTP/1.1\r\n");
        outw.print("Accept: text/plain, text/html, text/*\r\n");
        outw.print("\r\n");
        outw.flush();           

        InputStream in = s.getInputStream();
        InputStreamReader inr = new InputStreamReader(in);
        BufferedReader br = new BufferedReader(inr);
        String line;

        while ((line = br.readLine()) != null) {
                System.out.println(line);
        }

    } 
    catch (UnknownHostException e) {} 
    catch (IOException e) {}

        if (s != null) {
                try {
                        s.close();
                }
                catch ( IOException ioEx ) {}
        }
  }
}

Any help will be appreciated. Thank you.

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1 Answer

  1. Editorial Team

    If you really, really want to write your own HTTP client (harder than it seems, but very educative), you are missing the required Host header in HTTP 1.1:

    outw.print("Host: " + host + ":" + port + "\r\n");

    See RFC 2616, section 14.23. Host:

    A client MUST include a Host header field in all HTTP/1.1 request messages.

    So your request is bad, it misses required Host header.

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