Here is my learning on socket programing. Based on a book called TCP/IP网络编程 (ISBN 9787115358851).

The code is in c and not cross-platform. Here is code for windows. See the code for linux here.

The bookcode folder contains code originates from the book's example code (Not all example code is contained). And I may have adjusted the code style based on my own habit or added some adjustment.

The HTTP_server folder contains code implementing an HTTP server. The book's chapter24 demonstrated how to code a basic HTTP server. But it's quite basic, just accept, create new thread to read, resolve and write, without using any concurrent mode introduced in the book before. And the author mentioned that because for normal HTTP protocol, the server just close the connetion after responsing (short connection), no time for IOCP/epoll to make much effect, so using IOCP/epoll won't bring much improvement. Despite that, I used IOCP to implement the server (originate from chapter23/IOCPEchoServ.c).

The HTTP_request folder is a basic http request lib, able to send GET/POST request and call the corresponding callback after having received all the body data (assume that there's limited data).

The HTTPS_server folder is improved from HTTP_server using openssl library.

The HTTPS_request folder is improved from HTTP_request using openssl library.

I'm following camelCase naming convention for the windows code.

gcc --version:

gcc (x86_64-win32-seh-rev0, Built by MinGW-W64 project) 8.1.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The bookcode and HTTP_server... folders have different VSCode running configuration. So I used VSCode's mutiple workspace function: a .code-workspace file has declared mutiple projects. As long as you open the socket_programing.code-workspace file with VSCode, the projects will be treated as individual workspace.

So the approaches to run are:

1.Open the socket_programing.code-workspace file with VSCode and run corresponding src file with VSCode. If you have opened the whole project folder(namely the parent folder of socket_programing.code-workspace), you need to open the socket_programing.code-workspace file and click the "Open Workspace" VSCode UI button at the bottom-right corner to reopen, else the VSCode configuration would be incorrect.

2.Or you can open bookcode and HTTP_server... folders respectively with VSCode and run.

3.Or you can compile and run with command line.

For more details, see the secondary README.md files.