v60

v60 is an experimental HTTP server framework written in C++20.

Quick start

#include <v60/v60.hpp>

int main() {
    using namespace v60;
    auto root = get<"/hello">([](Request auto req, Response auto resp) -> task<void> {
        co_await resp.send("Hello from v60!");
    });

    server serv(std::move(root));
    serv.listen(8080);
}

/*
# Build and run it
curl http://localhost:8080/hello
Hello from v60!
*/

URL Parameters

See examples/parameter.cpp for an example

The request URL can be pattern matched and accessed with a type safe and compile time checked interface.

// OK, magic!
get</"user/:userId/hello">([](Request auto req, Response auto resp) -> task<void> {
    co_await resp.send("Hello there, " + std::string(get<"userId">(req.params)));
});

// Will fail to compile since there is no user_id parameter!
get</"user/:userId/hello">([](Request auto req, Response auto resp) -> task<void> {
    co_await resp.send("Hello there, " + std::string(get<"user_id">(req.params)));
});

The parameters are matched with regular expressions compiled at compile time with the amazing CTRE library.

Groups and bindings

See examples/backend.cpp for an example

auto name_route = get<"/name">([](Request auto req, Response auto resp) -> task<void> {
    co_await resp.send("Hello " + std::string(get<"userId">(req.params)) + ", your name is foo");
});

auto age_route = get<"/age">([](Request auto req, Response auto resp) -> task<void> {
    co_await resp.send("Hello " + std::string(get<"userId">(req.params)) + ", your age is 42");
});

auto user_routes = group(name_route, age_route);

auto user = bind<"/user/:userId">(user_routes);

Like with regular URL parameters, bound parameters are also checked. So if you try to access a non-existent parameter in a sub-route, it’ll not compile.

Building

v60 uses a bunch of C++20 features requires quite recent compiler.

The toolchains I’ve tested with are:

1. MSVC 19.28

2. Clang 12 + libcxx (trunk)

GCC-10 failed to build it, but I did not test trunk, though I’d expect it to work.

You’ll need a very recent boost (I tested with 1.75).

If you have a compiler with the necessary features:

MSVC

mkdir build
cd build
cmake -G "Visual Studio 16 2019" -A x64 ..
cmake --build . --target backend --config Debug

GCC/Clang

mkdir build
cd build
cmake -G Ninja ..
ninja backend