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我一直在为一个类编写一个简单的 Web 服务器 (http 1.0)，但是每当我尝试获取文件时 ( wget 127.0.0.1 /filename) 都短了几个字节。令人困惑的是，当我将发送的字节数与文件大小相匹配时，而不是wget接收的数量。

为什么wget没有得到我写入套接字的所有数据？

一些wget输出

wget:

    --2012-10-27 19:02:00--  (try: 4)  http://127.0.0.1:5555/
    Connecting to 127.0.0.1:5555... connected.
    HTTP request sent, awaiting response... 200 Document follows
    Length: 5777 (5.6K) [text/html]
    Saving to: `index.html.6'

    99% [=====================================> ] 5,776       --.-K/s   in 0s      

    2012-10-27 19:02:00 (322 MB/s) - Read error at byte 5776/5777 (Connection reset by peer).  Retrying.


    --2012-10-27 19:03:52--  (try: 4)  http://127.0.0.1:5555/ZoEY8.jpg
    Connecting to 127.0.0.1:5555... connected.
    HTTP request sent, awaiting response... 200 Document follows
    Length: 163972 (160K) [image/jpeg]
    Saving to: `ZoEY8.jpg.4'

    91% [==================================>    ] 149,449     --.-K/s   in 0.001s  

    2012-10-27 19:03:52 (98.8 MB/s) - Read error at byte 163917/163972 (Connection reset by peer). Retrying.

获取方法：

void *
processGetRequest(requestParser request)
{

  string resp= "HTTP/1.0 200 Document follows\r\nServer: lab5 \r\nContent-Length: ";
  string path="";
  path =request.path;

  //find file
  int page= open (path.c_str(),O_RDONLY);
  FILE * pageF= fdopen(page,"rb"); 


  //get size
  fseek(pageF, 0L, SEEK_END);
  int sz = ftell(pageF);
  fseek(pageF, 0L, SEEK_SET);

  //form content length
  stringstream ss;
  ss<<resp<<sz<<"\r\n";
  resp=ss.str(); 

  //make response
  if(page<0){
      cout<<"404 \n";
    resp = "HTTP/1.0 404 File Not Found\r\nServer: lab5 \r\nContent-type: text/html \r\n \r\n";

    write( request.fd, resp.c_str(), resp.length());

  return 0; 
  }
  if(path.find(".gif")!=string::npos)
   resp += "Content-type: image/gif\r\n \r\n";
  else if(path.find(".png")!=string::npos)
   resp += "Content-type: image/png\r\n \r\n";
  else if(path.find(".jpg")!=string::npos)
   resp += "Content-type: image/jpeg\r\n \r\n";
  else
   resp += "Content-type: text/html \r\n \r\n";

  //write response
  write( request.fd, resp.c_str(), resp.length());

  int total=0;      
  char buff[1024];
  int readBytes = 0;
  int er;

  //send file
  do{

  readBytes= read(page, buff, 1024);
  cout<<"read bytes "<<readBytes<<"\n";

  if(readBytes<0){
    perror("read");

    break;
  }
  total+=readBytes;
  er=  send( request.fd, buff, readBytes,0 );   
  cout<<"sent bytes "<<er<<"\n";
  if (er==-1){
    perror("send");
  }
  else if( er != readBytes){
    cout<<"Read write miss match\n";
  }

 }while(readBytes>0);

 close(page);
 return 0;
}

编辑：

我一直在工作，我想知道我的插座是否做错了

// Set the IP address and port for this server
struct sockaddr_in serverIPAddress; 
memset( &serverIPAddress, 0, sizeof(serverIPAddress) );
serverIPAddress.sin_family = AF_INET;
serverIPAddress.sin_addr.s_addr = INADDR_ANY;
serverIPAddress.sin_port = htons((u_short) port);

// Allocate a socket
int masterSocket =  socket(PF_INET, SOCK_STREAM, 0);
if ( masterSocket < 0) {
  perror("socket");
  exit( -1 );
}

while ( 1 ) {

// Accept incoming connections
struct sockaddr_in clientIPAddress;
int alen = sizeof( clientIPAddress );
int slaveSocket = accept( masterSocket,
              (struct sockaddr *)&clientIPAddress,
              (socklen_t*)&alen);
// send slaveSocket to get method 
}
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1 回答 1

1

我的第一个答案在下面，但我只是注意到了一些东西..

"Content-type: text/html \r\n \r\n";

标头必须用两个 CR/LF 与内容分开。看起来你那里有空间

你可以试试这个： 

 "Content-type: text/html\r\n\r\n";

最后一次写入后输出缓冲区是否正确刷新和关闭？尝试将 1024 字节读取缓冲区的大小更改为大于 gif 文件的大小。这不是解决方法，但您可能会得到不同的结果，这可能有助于找出问题的原因。也许还可以将一些日志记录到读写循环中。查看最后一次缓冲区写入的大小是否等于响应丢失的字节数。

于 2012-10-28T00:34:14.157 回答