Hyper is a is a fast HTTP implementation that many other Rust web frameworks leverage. It offers asynchronous I/O via the tokio runtime and works on Rust's stable channel.
Hyper is not a higher-level web framework and accordingly does not include ergonomic features such as simple endpoint routing, baked-in HTTP responses, or reusable middleware. For GraphQL, those aren't large downsides as all POSTs and GETs usually go through a single endpoint with a few clearly-defined response payloads.
Juniper's Hyper integration is contained in the
[dependencies] juniper = "0.10" juniper_hyper = "0.1.0"