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Thank you for the answer! Sir! However, I tried the try &amp;&nbsp;catch before, and it didn't catch any exception. I also calling Close on all three of them before I delete them. And I also use the callback function of the CInternetsession function. But it seems that the it never send the status of connection closed. It just seems that MFC doesn't implement the Close() function! Anyways, I am quite appreicating your answer! Thank you very much! &nbsp; 
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Thank you for the answer! Sir! However, I tried the try & catch before, and it didn't catch any exception. I also calling Close on all three of them before I delete them. And I also use the callback function of the CInternetsession function. But it seems that the it never send the status of connection closed. It just seems that MFC doesn't implement the Close() function! Anyways, I am quite appreicating your answer! Thank you very much!  

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 Hello! I wanna develop a Http client program! I use three classes (CInternetSession, ChttpConnection, Chttpfile) for doing this! Now I can connect to my web LAN server, send request, and get the response. However, when it finished, I use functions Chttpfile::Close() ChttpConnection::Close(), and CInternetSession::Close() to disconnect to the server. But It doesn't work at all. I also &quot;delete&quot; theses three classes. But the connection still exists until the server disconnect this connection, or I shutdown the program. Is there any solution to disconnect it? Thank you very much!
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 Hello! I wanna develop a Http client program! I use three classes (CInternetSession, ChttpConnection, Chttpfile) for doing this! Now I can connect to my web LAN server, send request, and get the response. However, when it finished, I use functions Chttpfile::Close() ChttpConnection::Close(), and CInternetSession::Close() to disconnect to the server. But It doesn't work at all. I also "delete" theses three classes. But the connection still exists until the server disconnect this connection, or I shutdown the program. Is there any solution to disconnect it? Thank you very much!

How to disconnect (using CInternetSession, ChttpConnection, Chttpfile)

Microsoft Visual C++ (often abbreviated as MSVC or VC++) is an integrated development environment (IDE) product from Microsoft for the C, C++, and C++/CLI programming languages. It features tools for developing and debugging C++ code, especially code written for the Microsoft Windows API, the DirectX API, and the Microsoft .NET Framework. Many applications require redistributable Visual C++ packages to function correctly and are often installed independently of applications, allowing multiple applications to make use of the package while only having to install it once