HTTP client for embedded devices

The reqwless crate implements an HTTP client that can be used in no_std environment, with any transport that implements the traits from the embedded-io crate. No alloc or std lib required!

It offers two sets of APIs:

• A low-level request API which allows you to contruct HTTP requests and write them to a embedded-io transport.
• A higher level client API which uses the embedded-nal-async (+ optional embedded-tls) crates to establish TCP + TLS connections.

example

let url = format!("http://localhost", addr.port());
let mut client = HttpClient::new(TokioTcp, StaticDns); // Types implementing embedded-nal-async
let mut rx_buf = [0; 4096];
let response = client
    .request(Method::POST, &url)
    .await
    .unwrap()
    .body(b"PING")
    .content_type(ContentType::TextPlain)
    .send(&mut rx_buf)
    .await
    .unwrap();

The client is still lacking many features, but can perform basic HTTP GET/PUT/POST/DELETE requests with payloads. However, not all content types and status codes are implemented, and are added on a need basis. For TLS, you can use embedded-tls as the transport.

If you are missing a feature or would like an improvement, please raise an issue or a PR.

Minimum supported Rust version (MSRV)

reqwless requires a feature from nightly to compile embedded-io with async support:

• type_alias_impl_trait

This feature is complete, but is not yet merged to stable.