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此代码向服务器发送请求。我正在使用端点打开一个套接字。我对 POST 内容长度有疑问。我没有使用 HttpWebRequst 而是一个套接字（来自我们的客户端平台），它连接到他们的服务器平台。这是发送一个长字符串请求。

Header = POST /OKMMIS  HTTP/5.1 
Request = header + content
Content-length = content.length
Content = @"ISA*00*          *00*          *ZZ*500000355      *ZZ*734476619      *130711*1023*^*00501*790719345*0*T*:~GS*HS*500000355*734476619*20130711*1023*273450*X*005010X279A1~ST*270*0001*005010X279A1~BHT*0022*13*635091349826842989*20130711*1023~HL*1**20*1~NM1*PR*2*Oklahoma Medicaid*****PI*734476619~HL*2*1*21*1~NM1*1P*2*Hillcrest Medical Center*****XX*1629057229~HL*3*2*22*0~TRN*1*20130711102317CDN266905*9CARDONHCN~NM1*IL*1*MESSNDREW*MARQUIS****MI*B10083667~REF*SY*323006707~DMG*D8*20100108*M~DTP*291*D8*20130512~EQ*30~SE*14*0001~GE*1*273450~IEA*1*790719345~";

呼叫m_socClient.Send(requestBytes)发送此消息。

他们的接收服务器日志给出了这个错误：

message[From HTTPUtil::getHttpRequest():Bytes to read is less than ZERO ???, req->headerLengh 为 49, req->contentLength 为 486，我们已经读取了 537 个字节

标头长度= 51。内容长度= 486。但是服务器读取539字节？我收到一个 HTTP 400 错误请求。这是来自服务器的响应

HTTP/1.1 400 Bad Request
Content-Length: 539

POST /OKMMISPOS  HTTP/5.1 
Content-Length: 486


ISA*00*          *00*          *ZZ*500000355      *ZZ*734476619      *130718*1129*^*00501*936078483*0*T*:~GS*HS*500000355*734476619*20130718*1129*326565*X*005010X279A1~ST*270*0001*005010X279A1~BHT*0022*13*635097437938418629*20130718*1129~HL*1**20*1~NM1*PR*2*Oklahoma Medicaid*****PI*734476619~HL*2*1*21*1~NM1*1P*2*Hillcrest Medical Center*****XX*1629057229~HL*3*2*22*0~NM1*IL*1*MARQUIS*****MI*B17993667~DMG*D8*20101208*M~DTP*291*D8*20130512~EQ*30~SE*12*0001~GE*1*326565~IEA*1*936078483~

我什至从哪里开始？ 

//// create a new client socket ...
string szIPSelected = "127.0.0.1";
int szPort = 50050;
m_socClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
System.Net.IPAddress remoteIPAddress = System.Net.IPAddress.Parse(szIPSelected);
System.Net.IPEndPoint remoteEndPoint = new System.Net.IPEndPoint(remoteIPAddress, szPort);

m_socClient.Connect(remoteEndPoint);

if (m_socClient.Connected)
{
    toolStripStatusLabel1.Text = "Connected to " + szIPSelected + ":" + szPort;
    statusStrip1.Refresh();

    string resource = "/OKMMISPOS";
    var header = String.Format("POST {0}  HTTP/5.1 " + Environment.NewLine, resource);
    String body = @"ISA*00*          *00*          *ZZ*500000355      *ZZ*734476619      *130711*1023*^*00501*790719345*0*T*:~GS*HS*500000355*734476619*20130711*1023*273450*X*005010X279A1~ST*270*0001*005010X279A1~BHT*0022*13*635091349826842989*20130711*1023~HL*1**20*1~NM1*PR*2*Oklahoma Medicaid*****PI*734476619~HL*2*1*21*1~NM1*1P*2*Hillcrest Medical Center*****XX*1629057229~HL*3*2*22*0~TRN*1*20130711102317CDN266905*9CARDONHCN~NM1*IL*1*MESSNDREW*MARQUIS****MI*B10083667~REF*SY*323006707~DMG*D8*20100108*M~DTP*291*D8*20130512~EQ*30~SE*14*0001~GE*1*273450~IEA*1*790719345~";
    byte[] bodyBytes = Encoding.ASCII.GetBytes(body);
    header += "Content-Length: " + (bodyBytes.Length) + Environment.NewLine + Environment.NewLine + Environment.NewLine;
    string request = String.Concat(header, body);
    textBox3.Text = request;
    textBox3.Refresh();
    byte[] requestBytes = Encoding.ASCII.GetBytes(request);
    m_socClient.Send(requestBytes);
    toolStripStatusLabel1.Text = "Sending  Request to  " + szIPSelected + ":" + szPort;
    statusStrip1.Refresh();
}

Thread.Sleep(3000);

byte[] bytes = new byte[1024];
int bytesRec = m_socClient.Receive(bytes);

txtResponse271.Text = Encoding.ASCII.GetString(bytes, 0, bytesRec);

m_socClient.Disconnect(true);
m_socClient.Close();
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