//
// HtHTTP.cc
//
// HtHTTP: Interface classes for HTTP messaging
//
// Including:
// 	 -  Generic class
// 	 -  Response message class
//
// Part of the ht://Dig package   <http://www.htdig.org/>
// Copyright (c) 1995-2003 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Public License version 2 or later
// <http://www.gnu.org/copyleft/gpl.html>
//
// $Id: HtHTTP.cc,v 1.31 2008-11-16 18:28:52 angusgb Exp $ 
//

#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif /* HAVE_CONFIG_H */

#include "lib.h"
#include "Transport.h"
#include "HtHTTP.h"

#include <signal.h>
#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>      // for sscanf

// for setw()
#ifdef HAVE_STD
#include <iomanip>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif
#else
#include <iomanip.h>
#endif /* HAVE_STD */

#if 1
typedef void (*SIGNAL_HANDLER) (...);
#else
typedef SIG_PF SIGNAL_HANDLER;
#endif

   // User Agent
   	 String HtHTTP::_user_agent = 0;

   // Stats information
   	 int HtHTTP::_tot_seconds = 0;
   	 int HtHTTP::_tot_requests = 0;
   	 int HtHTTP::_tot_bytes = 0;

   // flag that manage the option of 'HEAD' before 'GET'
         bool HtHTTP::_head_before_get = true;

   // Handler of the CanParse function

         int (* HtHTTP::CanBeParsed) (char *) = 0;
      
   // Cookies jar
      	 HtCookieJar *HtHTTP::_cookie_jar = 0;  // Set to 0 by default

///////
   //    HtHTTP_Response class
   //
   //    Response message sent by the remote HTTP server
///////


// Construction

HtHTTP_Response::HtHTTP_Response()
: _version(0),
   _transfer_encoding(0),
   _server(0),
   _hdrconnection(0),
   _content_language(0)
{
}


// Destruction

HtHTTP_Response::~HtHTTP_Response()
{
}


void HtHTTP_Response::Reset()
{

   // Call the base class method in order to reset
   // the base class attributes

   Transport_Response::Reset();

   // Initialize the version, transfer-encoding, location and server strings
   _version.trunc();
   _transfer_encoding.trunc();
   _hdrconnection.trunc();
   _server.trunc();
   _content_language.trunc();

}




///////
   //    HtHTTP generic class
   //
   //    
///////


// Construction

HtHTTP::HtHTTP(Connection& connection)
: Transport(&connection),
   _Method(Method_GET), // Default Method Request
   _bytes_read(0),
   _accept_language(0),
   _persistent_connection_allowed(true),
   _persistent_connection_possible(false),
   _send_cookies(true)
{
}

// Destruction

HtHTTP::~HtHTTP()
{
}


///////
   //    Manages the requesting process
///////

Transport::DocStatus HtHTTP::Request()
{

   DocStatus result = Document_ok;

///////
   //    We make a double request (HEAD and, maybe, GET)
   //    Depending on the
///////

   if (HeadBeforeGet() &&                 // Option value to true
      isPersistentConnectionAllowed() &&  // Persistent Connections allowed
      _Method == Method_GET)              // Initial request method is GET
   {

      if (debug>3)
         cout << "  Making a HEAD call before the GET" << endl;

      _Method = Method_HEAD;

      result = HTTPRequest();

      _Method = Method_GET;
   }

   if (result == Document_ok)
      result = HTTPRequest();

   if(result == Document_no_header
      && isPersistentConnectionAllowed())
   {
 
      // Sometimes, the parsing phase of the header of the response
      // that the server gives us back, fails and a <no header>
      // error is raised. This happens with HTTP/1.1 persistent
      // connections, usually because the previous response stream
      // has not yet been flushed, so the buffer still contains
      // data regarding the last document retrieved. That sucks alot!
      // The only thing to do is to lose persistent connections benefits
      // for this document, so close the connection and 'GET' it again.
 
      CloseConnection();      // Close a previous connection
 
      if (debug>0)
      {
          cout << "  # -> connection closed (try again)" << endl;
          if (debug>1)
            cout << "! Impossible to get the HTTP header line." << endl;
      }
 
      result = HTTPRequest(); // Get the document again
 
   }
   else if(result == Document_server_error && _Method == Method_HEAD)
   {
       // In some cases, when performing a HEAD request some server
       // may respond with an internal server error; the library will
       // automatically recover, issuing a GET request

      if (debug>0)
          cout << "  # -> HEAD request failed (try with GET)" << endl;
 
      _Method = Method_GET;
      result = HTTPRequest();
   }

   return result;
}


///////
   //    Sends an HTTP 1/1 request
///////

Transport::DocStatus HtHTTP::HTTPRequest()
{

   static Transport::DocStatus DocumentStatus;
   bool ShouldTheBodyBeRead = true;

   SetBodyReadingController(&HtHTTP::ReadBody);

   // Reset the response
   _response.Reset();

   // Flush the connection
   FlushConnection();

   _bytes_read=0;

   if( debug > 4)
   	 cout << "Try to get through to host "
	      << _url.host() << " (port " << _url.port() << ")" << endl;

   ConnectionStatus result;

   // Assign the timeout
   AssignConnectionTimeOut();

   // Assign number of retries
   AssignConnectionRetries();

   // Assign connection wait time
   AssignConnectionWaitTime();

   // Start the timer
   _start_time.SettoNow();

   result = EstablishConnection();

   if(result != Connection_ok && result != Connection_already_up)
   {

      switch (result)
      {
         // Open failed
		
         case Connection_open_failed:
            if (debug>1)
               cout << "Unable to open the connection with host: "
                  << _url.host() << " (port " << _url.port() << ")" << endl;
	    CloseConnection();
            return FinishRequest(Document_no_connection);
            break;

         // Server not reached
         case Connection_no_server:
            if (debug>1)
               cout << "Unable to find the host: "
                  << _url.host() << " (port " << _url.port() << ")" << endl;
	    CloseConnection();
            return FinishRequest(Document_no_host);
            break;
	
         // Port not reached
         case Connection_no_port:
            if (debug>1)
               cout << "Unable to connect with the port " << _url.port()
                  << " of the host: " << _url.host() << endl;
	    CloseConnection();
            return FinishRequest(Document_no_port);
            break;
	
         // Connection failed
         case Connection_failed:
            if (debug>1)
               cout << "Unable to establish the connection with host: "
                  << _url.host() << " (port " << _url.port() << ")" << endl;
	    CloseConnection();
            return FinishRequest(Document_no_connection);
            break;

         // Other reason
         default:
            if (debug>1)
               cout << "connection failed with unexpected result: result = "
                  << (int)result << ", "
                  << _url.host() << " (port " << _url.port() << ")" << endl;
	    CloseConnection();
            return FinishRequest(Document_other_error);
            break;
         }
	
   	 return FinishRequest(Document_other_error);

   }

   // Visual comments about the result of the connection
   if (debug > 5)
   	 switch(result)
      {
	    case Connection_already_up:
   	       cout << "Taking advantage of persistent connections" << endl;
   	       break;
	    case Connection_ok:
   	       cout << "New connection open successfully" << endl;
	       break;
	    default:
	       cout << "Unexptected value: " << (int)result << endl;
	       break;
   }

   String command;

   switch(_Method)
   {
      case Method_GET:
   	    command = "GET ";
            break;
      case Method_HEAD:
            command = "HEAD ";
            ShouldTheBodyBeRead = false;
      break;
   }

   // Set the request command

   SetRequestCommand(command);

   if (debug > 6)
      cout << "Request\n" << command;

   // Writes the command
   ConnectionWrite(command);

   // Parse the header
   if (ParseHeader() == -1) // Connection down
   {
	    // The connection probably fell down !?!
   	 	 if ( debug > 4 )
	       cout << setw(5) << Transport::GetTotOpen() << " - "
                  << "Connection fell down ... let's close it" << endl;

	    CloseConnection();	// Let's close the connection which is down now
	
	    // Return that the connection has fallen down during the request
	    return FinishRequest(Document_connection_down);
   }


   if (_response._status_code == -1)
   {
   	 // Unable to retrieve the status line

   	 if ( debug > 4 )
	    cout << "Unable to retrieve or parse the status line" << endl;
	
   	 return FinishRequest(Document_no_header);
   }


   if (debug > 3)
   {

      cout << "Retrieving document " << _url.path() << " on host: "
         << _url.host() << ":" << _url.port() << endl;
		
      cout << "Http version      : " << _response._version << endl;
      cout << "Server            : " << _response._version << endl;
      cout << "Status Code       : " << _response._status_code << endl;
      cout << "Reason            : " << _response._reason_phrase << endl;

      if (_response.GetAccessTime())
      cout << "Access Time       : " << _response.GetAccessTime()->GetRFC1123() << endl;

      if (_response.GetModificationTime())
      cout << "Modification Time : " << _response.GetModificationTime()->GetRFC1123() << endl;

      cout << "Content-type      : " << _response.GetContentType() << endl;

      if (_response._transfer_encoding.length())
      cout << "Transfer-encoding : " << _response._transfer_encoding << endl;

      if (_response._content_language.length())
      cout << "Content-Language : " << _response._content_language << endl;

      if (_response._hdrconnection.length())
      cout << "Connection        : " << _response._hdrconnection << endl;

   }

   // Check if persistent connection are possible
   CheckPersistentConnection(_response);

   if (debug > 4)
   	 cout << "Persistent connection: "
	    << (_persistent_connection_possible ? "would be accepted" : "not accepted")
	    << endl;

   DocumentStatus = GetDocumentStatus(_response);

   // We read the body only if the document has been found
   if (DocumentStatus != Document_ok)
   {
      ShouldTheBodyBeRead=false;
   }

   // For now a chunked response MUST BE retrieved
   if (mystrncasecmp ((char*)_response._transfer_encoding, "chunked", 7) == 0)
   {
      // Change the controller of the body reading
      SetBodyReadingController(&HtHTTP::ReadChunkedBody);
   }

   // If "ShouldTheBodyBeRead" is set to true and	
   // If the document is parsable, we can read the body
   // otherwise it is not worthwhile

   if (ShouldTheBodyBeRead)
   {
      if ( debug > 4 )
         cout << "Reading the body of the response" << endl;

      // We use a int (HtHTTP::*)() function pointer
      if ( (this->*_readbody)() == -1 )
      {
         // The connection probably fell down !?!
         if ( debug > 4 )
            cout  << setw(5) << Transport::GetTotOpen() << " - "
               << "Connection fell down ... let's close it" << endl;
	
         CloseConnection();	// Let's close the connection which is down now
	
         // Return that the connection has fallen down during the request
         return FinishRequest(Document_connection_down);
      }

      if ( debug > 6 )
         cout << "Contents:" << endl << _response.GetContents();

      // Check if the stream returned by the server has not been completely read

      if (_response._document_length != _response._content_length &&
          _response._document_length == _max_document_size)
      {
         // Max document size reached

         if (debug > 4)
            cout << "Max document size (" << GetRequestMaxDocumentSize()
               << ") reached ";

         if (isPersistentConnectionUp())
         {
           // Only have to close persistent connection when we didn't read
           // all the input. For now, we always read all chunked input...
           if (mystrncasecmp ((char*)_response._transfer_encoding, "chunked", 7) != 0)
           {
            if (debug > 4)
               cout << "- connection closed. ";

            CloseConnection();
           }
         }

         if (debug > 4)
            cout << endl;
      }

      // Make sure our content-length makes sense, if none given...
      if (_response._content_length < _response._document_length)
         _response._content_length = _response._document_length;

   }
   else if ( debug > 4 )
         cout << "Body not retrieved" << endl;


   // Close the connection (if there's no persistent connection)

   if( ! isPersistentConnectionUp() )
   {
      if ( debug > 4 )
         cout  << setw(5) << Transport::GetTotOpen() << " - "
            << "Connection closed (No persistent connection)" << endl;

      CloseConnection();
   }
   else
   {
      // Persistent connection is active

      // If the document is not parsable and we asked for it with a 'GET'
      // method, the stream's not been completely read.

      if (DocumentStatus == Document_not_parsable && _Method == Method_GET)
      {
         // We have to close the connection.
         if ( debug > 4 )
            cout << "Connection must be closed (stream not completely read)"
               << endl;

         CloseConnection();

      }
      else
         if ( debug > 4 )
            cout << "Connection stays up ... (Persistent connection)" << endl;
   }


   // Check the doc_status and return a value

   return FinishRequest(DocumentStatus);

}



HtHTTP::ConnectionStatus HtHTTP::EstablishConnection()
{

   int result;

   // Open the connection
   result=OpenConnection();

   if (!result)
   	 return Connection_open_failed; // Connection failed
   else  if(debug > 4)
         {
            cout << setw(5) << Transport::GetTotOpen() << " - ";

   	    if (result == -1)
	       cout << "Connection already open. No need to re-open." << endl;
	    else
	       cout << "Open of the connection ok" << endl;
         }


   if(result==1) // New connection open
   {

      // Assign the remote host to the connection
      if ( !AssignConnectionServer() )
      	 return Connection_no_server;   	
	 else if (debug > 4)
	       cout << "\tAssigned the remote host " << _url.host() << endl;

      // Assign the port of the remote host
      if ( !AssignConnectionPort() )
      	 return Connection_no_port;   	
	 else if (debug > 4)
	       cout << "\tAssigned the port " << _url.port() << endl;
   }

   // Connect
   if (! (result = Connect()))
   	 return Connection_failed;
   else if (result == -1) return Connection_already_up; // Persistent
	    else return Connection_ok; // New connection

}



// Set the string of the HTTP message request

void HtHTTP::SetRequestCommand(String &cmd)
{

   // Initialize it

   if (_useproxy) {
	cmd << _url.get() << " HTTP/1.1\r\n";
   } else
   cmd << _url.path() << " HTTP/1.1\r\n";

   // Insert the "virtual" host to which ask the document

   cmd << "Host: " << _url.host();
   if (_url.port() != 0 && _url.port() != _url.DefaultPort())
      cmd << ":" << _url.port();
   cmd << "\r\n";

	
   // Insert the User Agent

   if (_user_agent.length())
      cmd << "User-Agent: " << _user_agent << "\r\n";


   // Referer
   if (_referer.get().length())
     cmd << "Referer: " << _referer.get() << "\r\n";

   // Accept-Language
   if (_accept_language.length())
     cmd << "Accept-language: " << _accept_language << "\r\n";

   // Authentication
   if (_credentials.length())
     cmd << "Authorization: Basic " << _credentials << "\r\n";

   // Proxy Authentication
   if (_useproxy && _proxy_credentials.length())
     cmd << "Proxy-Authorization: Basic " << _proxy_credentials << "\r\n";

   // Accept Charset
   cmd << "Accept-Charset: *\r\n";

   // Accept-Encoding: waiting to handle the gzip and compress formats, we
   // just send an empty header which, according to the HTTP 1/1 standard,
   // should let the server know that we only accept the 'identity' case
   // (no encoding of the document)
   cmd << "Accept-Encoding: \r\n";

   // A date has been passed to check if the server one is newer than
   // the one we already own.

   if(_modification_time && *_modification_time > 0)
   {
       _modification_time->ToGMTime();
       cmd << "If-Modified-Since: " << _modification_time->GetRFC1123() << "\r\n";
   }

///////
   // 	 Cookies! Let's go eat them! ;-)
///////

   // The method returns all the valid cookies and writes them
   // directly into the request string, as a list of headers
   if (_send_cookies && _cookie_jar)
      _cookie_jar->SetHTTPRequest_CookiesString(_url, cmd);


   // Let's close the command
   cmd << "\r\n";
   
}




//*****************************************************************************
// int HtHTTP::ParseHeader()
//   Parse the header of the document
//
int HtHTTP::ParseHeader()
{
    String	line = 0;
    int		inHeader = 1;

    if (_response._modification_time)
    {
	delete _response._modification_time;
	_response._modification_time=0;
    }
    while (inHeader)
    {

      line.trunc();
         
      if(! _connection->Read_Line(line, "\n"))
         return -1;  // Connection down
	 
      _bytes_read+=line.length();
      line.chop('\r');
      
      if (line.length() == 0)
         inHeader = 0;
      else
      {
         // Found a not-empty line
	
         if (debug > 2)
            cout << "Header line: " << line << endl;
	
         // Status - Line check
         char	*token = line.get();

         while (*token && !isspace(*token) && *token != ':')
            ++token;

         while (*token && (isspace(*token) || *token == ':'))
            ++token;
	
         if(!strncmp((char*)line, "HTTP/", 5))
         {
            // Here is the status-line

            // store the HTTP version returned by the server
            _response._version = strtok(line, " ");

            // Store the status code
            _response._status_code = atoi(strtok(0, " "));
			
            // Store the reason phrase
            _response._reason_phrase = strtok(0, "\n");

         }
         else if( ! mystrncasecmp((char*)line, "server:", 7))
         {
            // Server info
		
            // Set the server info
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._server = token;

         }
         else if( ! mystrncasecmp((char*)line, "last-modified:", 14))
         {
            // Modification date sent by the server
		
            // Set the response modification time
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._modification_time = NewDate(token);

         }
         else if( ! mystrncasecmp((char*)line, "date:", 5))
         {
            // Access date time sent by the server
		
            // Set the response access time
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._access_time = NewDate(token);

         }
         else if( ! mystrncasecmp((char*)line, "content-type:", 13))
         {
            // Content - type
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._content_type = token;

         }
         else if( ! mystrncasecmp((char*)line, "content-length:", 15))
         {
            // Content - length
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._content_length = atoi(token);

         }
         else if( ! mystrncasecmp((char*)line, "transfer-encoding:", 18))
         {
            // Transfer-encoding
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._transfer_encoding = token;

         }
         else if( ! mystrncasecmp((char*)line, "location:", 9))
         {
            // Found a location directive - redirect in act
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._location = token;

         }
         else if( ! mystrncasecmp((char*)line, "connection:", 11))
         {
            // Ooops ... found a Connection clause
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._hdrconnection = token;

         }
         else if( ! mystrncasecmp((char*)line, "content-language:", 17))
         {
            // Found a content-language directive
		
            token = strtok(token, "\n\t");

            if (token && *token)
               _response._content_language = token;

         }
         else if( ! mystrncasecmp((char*)line, "set-cookie:", 11))
         {
 	    // Found a cookie
		
            // Are cookies enabled?
			if (_send_cookies && _cookie_jar)
            {
               token = strtok(token, "\n\t");

               if (token && *token)
	       {
      	          // Insert the cookie into the jar
      	          _cookie_jar->AddCookie(token, _url);
	       }
            }

         }
         else
         {
            // Discarded
			
            if (debug > 3)
               cout << "Discarded header line: " << line << endl;
         }
      }
    }

    if (_response._modification_time == 0)
    {
      if (debug > 3)
         cout << "No modification time returned: assuming now" << endl;
         
         //Set the modification time
	_response._modification_time = new HtDateTime;
        _response._modification_time->ToGMTime(); // Set to GM time

    }
    
    return 1;
   
}


// Check for a document to be parsable
// It all depends on the content-type directive returned by the server

bool HtHTTP::isParsable(const char *content_type)
{

   // Here I can decide what kind of document I can parse
   // depending on the value of Transport:_default_parser_content_type
   // and the rest are determined by the external_parser settings
   
   if( ! mystrncasecmp (_default_parser_content_type.get(), content_type,
      _default_parser_content_type.length()) )
       return true;
       
   // External function that checks if a document is parsable or not.
   // CanBeParsed should point to a function that returns an int value,
   // given a char * containing the content-type.

   if (CanBeParsed && (*CanBeParsed)( (char *) content_type) )
      return true;

   return false;
   	
}


// Check for a possibile persistent connection
// on the return message's HTTP version basis

void HtHTTP::CheckPersistentConnection(HtHTTP_Response &response)
{

   const char *version = response.GetVersion();

   if( ! mystrncasecmp ("HTTP/1.1", version, 8))
   {
      const char *connection = response.GetConnectionInfo();

      if( ! mystrncasecmp ("close", connection, 5))
         _persistent_connection_possible=false; // Server wants to close
      else _persistent_connection_possible=true;

   }
   else
      _persistent_connection_possible=false;
   	
}


HtHTTP::DocStatus HtHTTP::FinishRequest (HtHTTP::DocStatus ds)
{

   int seconds;

   // Set the finish time
   _end_time.SettoNow();

   // Let's add the number of seconds needed by the request
   seconds=HtDateTime::GetDiff(_end_time, _start_time);

   _tot_seconds += seconds;
   _tot_requests ++;
   _tot_bytes += _bytes_read;

   if (debug > 2)
      cout << "Request time: " << seconds << " secs" << endl;

   return ds;

}


HtHTTP::DocStatus HtHTTP::GetDocumentStatus(HtHTTP_Response &r)
{ 

   // Let's give a look at the return status code

   HtHTTP::DocStatus returnStatus=Document_not_found;
   int statuscode;

   statuscode=r.GetStatusCode();

   if(statuscode==200)
   { 
	    returnStatus = Document_ok;   // OK

   	    // Is it parsable?
	
   	    if (! isParsable ((const char*)r.GetContentType()) )
   	 	    returnStatus=Document_not_parsable;
   }
   else if(statuscode > 200 && statuscode < 300)
	    returnStatus = Document_ok;      	   	 // Successful 2xx
   else if(statuscode==304)
	    returnStatus = Document_not_changed;   	 // Not modified
   else if(statuscode > 300 && statuscode < 400)
	    returnStatus = Document_redirect;      	 // Redirection 3xx
   else if(statuscode==401)
	    returnStatus = Document_not_authorized;   // Unauthorized
   else if(statuscode >= 500 && statuscode < 600)
	    returnStatus = Document_server_error;   // Internal server error 5xx

   // Exit the function
   return returnStatus;
	    
}

void HtHTTP::SetCredentials (const String& s)
{
   Transport::SetHTTPBasicAccessAuthorizationString(_credentials, s);
}


void HtHTTP::SetProxyCredentials (const String& s)
{
   Transport::SetHTTPBasicAccessAuthorizationString(_proxy_credentials, s);
}

int HtHTTP::ReadBody()
{

    _response._contents = 0;	// Initialize the string
    
    char	docBuffer[8192];
    int		bytesRead = 0;
    int		bytesToGo = _response._content_length;

    if (bytesToGo < 0 || bytesToGo > _max_document_size)
        bytesToGo = _max_document_size;

    while (bytesToGo > 0)
    {
        int len = bytesToGo< (int)sizeof(docBuffer) ? bytesToGo : (int)sizeof(docBuffer);
        bytesRead = _connection->Read(docBuffer, len);
        if (bytesRead <= 0)
            break;

	_response._contents.append(docBuffer, bytesRead);

	bytesToGo -= bytesRead;
	
	_bytes_read+=bytesRead;

    }

    // Set document length
    _response._document_length = _response._contents.length();

   return bytesRead;
   
}


int HtHTTP::ReadChunkedBody()
{
   // Chunked Transfer decoding
   // as shown in the RFC2616 (HTTP/1.1) - 19.4.6
    
#define  BSIZE  8192

   int            length = 0;  // initialize the length
   unsigned int   chunk_size;
   String         ChunkHeader = 0;
   char           buffer[BSIZE+1];
   int		  chunk, rsize;

   _response._contents.trunc();	// Initialize the string

   // Read chunk-size and CRLF
   if (!_connection->Read_Line(ChunkHeader, "\r\n"))
      return -1;

   sscanf ((char *)ChunkHeader, "%x", &chunk_size);

   if (debug>4)
      cout << "Initial chunk-size: " << chunk_size << endl;

   while (chunk_size > 0)
   {
      chunk = chunk_size;

      do {
	if (chunk > BSIZE) {
	  rsize = BSIZE;
	  if (debug>4)
	    cout << "Read chunk partial: left=" <<  chunk << endl;
	} else {
	  rsize = chunk;
	}
	chunk -= rsize;

	// Read Chunk data
	if (_connection->Read(buffer, rsize) == -1)
	  return -1;

	length+=rsize;

	// Append the chunk-data to the contents of the response
        // ... but not more than _max_document_size...
        if (rsize > _max_document_size-_response._contents.length())
            rsize = _max_document_size-_response._contents.length();
	buffer[rsize] = 0;
	_response._contents.append(buffer, rsize);
                  
      } while (chunk);

     //     if (_connection->Read(buffer, chunk_size) == -1)
     //       return -1;

      // Read CRLF - to be ignored
      if (!_connection->Read_Line(ChunkHeader, "\r\n"))
         return -1;

      // Read chunk-size and CRLF
      if (!_connection->Read_Line(ChunkHeader, "\r\n"))
         return -1;

      sscanf ((char *)ChunkHeader, "%x", &chunk_size);

      if (debug>4)
         cout << "Chunk-size: " << chunk_size << endl;
   }
   
   ChunkHeader = 0;
   
   // Ignoring next part of the body - the TRAILER
   // (it contains further headers - not implemented)

    // Set content length
   _response._content_length = length;

    // Set document length
    _response._document_length = _response._contents.length();

   return length;

}


///////
   //    Show the statistics
///////

ostream &HtHTTP::ShowStatistics (ostream &out)
{
   Transport::ShowStatistics(out);  // call the base class method

   out << " HTTP Requests             : " << GetTotRequests() << endl;
   out << " HTTP KBytes requested     : " << (double)GetTotBytes()/1024 << endl;
   out << " HTTP Average request time : " << GetAverageRequestTime()
      << " secs" << endl;
         
   out << " HTTP Average speed        : " << GetAverageSpeed()/1024
      << " KBytes/secs" << endl;

   return out;
}
