簡單的Java代理服務器 - 谷歌搜索錯誤

Question

我已經寫了簡單的HTTP代理服務器一切正常，除了谷歌搜索，即時通訊reciving谷歌瀏覽器「網:: ERR_EMPTY_RESPONSE」的錯誤，並在歌劇「連接被遠程服務器關閉」。我沒有再想法如何解決它。你可以幫幫我嗎？

import java.io.*; 
import java.nio.ByteBuffer; 
import java.nio.CharBuffer; 
import java.nio.channels.*; 
import java.nio.charset.*; 
import java.net.*; 
import java.text.DateFormat; 
import java.text.SimpleDateFormat; 
import java.util.*; 

public class Server <Parametr>{ 

private Calendar current; 
private DateFormat dformat; 
private int localport = 0; 
private int remoteport = 80; 
private String remoteAddress = "127.0.0.1"; 
private Proxy proxy; 
private ServerSocketChannel servsocketchannel; 
private boolean local = false; 

public Server(int port){ 
    setServerPort(port); 
    openServerPort(); 
    checkAndSetRemoteProxyServer(); 
    dformat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss"); 
    current = Calendar.getInstance(); 
    createServerSocketAndTalk(); 
} 

public void setServerPort(int port){ 
    this.localport = port; 
} 

public void setProxyAddressAndPort(int port, String address){ 
    this.remoteport = port; 
    this.remoteAddress = address; 
} 

public void openServerPort(){ 
    try { 
     servsocketchannel = ServerSocketChannel.open(); 
     servsocketchannel.socket().bind(new java.net.InetSocketAddress(localport)); 
    } catch (BindException exc) { 
     System.out.println("Server isn't started, local port is blocked or used, check firewall or set new port"); 

    } catch (IOException e){ 
     System.out.println("Server isn't started, local port is blocked or used, check firewall or set new port"); 
    } 
} 

public void checkAndSetRemoteProxyServer(){ 
    boolean ERROR = false; 
    Socket proxysocketchannel = null; 
    try { 
     proxysocketchannel = new Socket(remoteAddress, remoteport);  
    } catch (UnknownHostException ex) { 
     System.out.println("Proxy server address is probably offline, please provide new server address --- RUNNING LOCAL PROXY MODE"); 
     ERROR = true; 
    } catch (IOException exc) {   
     System.out.println("Connecting to the proxy server failed, please review address and port --- RUNNING LOCAL PROXY MODE"); 
     ERROR = true; 
    } 

    if(!ERROR){ 
     System.out.println("Proxy state - online"); 
     proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(remoteAddress, remoteport)); 
     System.out.println("Initialization successful - waiting for clients "); 
    } 
    else{ 
     System.out.println("Problem with proxy connection, check your settings or set new proxy address --- RUNNING LOCAL PROXY MODE"); 
     System.out.println("Proxy local mode initialization successful - waiting for clients "); 
     local = true; 
    }    
} 

    public void createServerSocketAndTalk(){   
     try { 
      while(servsocketchannel.isOpen()){    
       Runnable r = new ClientHandler(servsocketchannel.accept()); 
       Thread t = new Thread(r); 
       t.start();    
      } 
     }catch(NotYetBoundException exc){ 
      System.out.println("Server not started local port is already used, please choose new local port");  
     }catch (AsynchronousCloseException ex) { 
      System.out.println("Server Closed"); 
     } 
     catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

class ClientHandler implements Runnable{ 

     SocketChannel client = null; 

     private static final int BUFFER_SIZE = 32768; 

     public ClientHandler(SocketChannel client){ 
      this.client = client; 
     } 

     @Override 
     public void run() { 
      letsTalk(); 
      try { 
       this.finalize(); 
      } catch (Throwable e) { 
       e.printStackTrace(); 
      } 
     }   

     public void letsTalk(){ 

       while(true){ 

         if(client.socket().isClosed()){ 
          break; 
         } 

         BufferedReader clientin = null; 
         DataOutputStream clientout = null;      

         try { 
          clientin = new BufferedReader(new InputStreamReader(client.socket().getInputStream()));       
          clientout = new DataOutputStream(client.socket().getOutputStream()); 
         } catch (IOException e) { 
          System.out.println("Error with client connection");       
          break;      
         }       

          String inputline; 
          String url = ""; 

          try { 
          while((inputline = clientin.readLine()) != null){ 
            System.out.println(inputline); 
            StringTokenizer readerclient = new StringTokenizer(inputline); 
            if(readerclient.nextToken().equals("GET")){          
             url = readerclient.nextToken(); 
             System.out.println("Requested URL: " + url); 
             break; 
            }   
            if(readerclient.nextToken().equals("POST")){ 
             System.out.println("POST"); 
            } 
          } 
         } catch (IOException e) { 
          System.out.println("URL REQUEST ERROR"); 
          e.printStackTrace(); 
         } catch (NullPointerException exc){ 

         } 

          try { 
          URL reqURL = new URL(url); 
          URLConnection connection = null; 
          if(local){ 
           connection = reqURL.openConnection(); 
          } 
          else { 
           connection = reqURL.openConnection(proxy); 
          } 
          connection.setDoInput(true); 
          connection.setDoOutput(false); 

          InputStream is = null; 
          is = connection.getInputStream(); 

          byte by[] = new byte[ BUFFER_SIZE ]; 
          int index = is.read(by, 0, BUFFER_SIZE); 

           while (index != -1){ 
            clientout.write(by, 0, index); 
            index = is.read(by, 0, BUFFER_SIZE); 
           } 

           clientout.flush(); 

          }catch(Exception ex){ 

          } 

          try { 
          clientin.close(); 
          clientout.close(); 
         // client.close(); 
         } catch (IOException e) { 
          e.printStackTrace(); 
         } 

       } 
    } 

} 
} 

Answer 1

我找到了解決方案。 您有以下添加到URLConnection

connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0; H010818)");