wasi 0.14.7+wasi-0.2.4

WASI API bindings for Rust
Documentation 
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use std::io::Write as _;

use wasip2::http::types::{
    Fields, IncomingRequest, OutgoingBody, OutgoingResponse, ResponseOutparam,
};

wasip2::http::proxy::export!(Example);

struct Example;

impl wasip2::exports::http::incoming_handler::Guest for Example {
    fn handle(_request: IncomingRequest, response_out: ResponseOutparam) {
        let resp = OutgoingResponse::new(Fields::new());
        let body = resp.body().unwrap();

        ResponseOutparam::set(response_out, Ok(resp));

        let mut out = body.write().unwrap();
        out.write_all(b"Hello, WASI!").unwrap();
        out.flush().unwrap();
        drop(out);

        OutgoingBody::finish(body, None).unwrap();
    }
}