Build fast HTTP apis fast, with Rust, and OpenAPI

• Define your API as an OpenAPI 3.0 spec
• HSR will code-gen a server/client interface
• Implement your interface (simple, safe, strongly typed!)
• Run! 'If it compiles, it works!'

Take a look at the quickstart example. It contains the minimum boilerplate needed to get up and running.

Read the tutorial for a step-by-step guide to get up and running.

Take a look at the petstore example for a more complex example with a mocked database backend.

• HTTP server
• HTTP client
• Type-safe path/query/json handling
• Supports all HTTP verbs
• High performance
• Based on async/await and actix-web 2.0

What's the difference between this and swagger-rs?

I haven't used swagger-rs, however the major difference is that hsr is pure Rust, whereas swagger-rs takes advantage of an existing code-generator written in Java. That means that the swagger-rs is more mature likely much more correct, hsr is much easier to use and is seamlessly integrated into typical Rust workflow.

What do you mean, 'fast'?

It uses Actix-Web under the hood, rated as one of the fastest web frameworks by techempower. hsr imposes very little overhead on top.

As a simple and not-very-scientific benchmark, on my laptop (X1 Carbon 6th Gen) I measured around:

• 120,000 requests/second for an empty GET request
• 100,000 requests/second for a POST request with a JSON roundtrip

Try it yourself! See the bench example.

Why the name?

I like fast trains.

MIT