Introducing Proxygen, Facebook's C++ HTTP framework | Engineering Blog | Facebook Code | Facebook
GitHub - facebook/proxygen: A collection of C++ HTTP libraries including an easy to use HTTP server.
So yeah, Facebook has an open-source HTTP library written in C++. And it seems to support C++11 as well. So that's pretty exciting.
I'm thinking about trying it out this weekend. Also, today I learned that in CMake, you declare the project before you find_package().