make && make install
The header, httpcpp.h, and the library, ./lib/libhttpcpp.a, will be placed in /usr/local/include and /usr/local/lib, respectively.
make example
The binary will be available in directory ./bin. To see how to program HTTP clients/servers using the APIs provided by the library, look at the code in example.cpp.
I am by no means a C++ expert, but I try my best to write a simple and easy-to-understand code for the greatest benefit of mankind (sounds a little too big now!). What I am trying to say is if you find bugs (or believed to be ones) or have suggestion, please feel free to communicate to me by creating issues in GitHub. Of course, pull requests are warmly welcome.