wasi-experimental-http

Experimental HTTP library for WebAssembly

Using the crate

First, add this crate to your project. Then, it can be used to create and send an HTTP request to a server:

```rust use bytes::Bytes; use http; use wasiexperimentalhttp;

[no_mangle]

pub extern "C" fn start() { let url = "https://postman-echo.com/post".tostring(); let req = http::request::Builder::new() .method(http::Method::POST) .uri(&url) .header("Content-Type", "text/plain") .header("abc", "def"); let b = Bytes::from("Testing with a request body. Does this actually work?"); let req = req.body(Some(b)).unwrap();

let res = wasi_experimental_http::request(req).expect("cannot make request");
let str = std::str::from_utf8(&res.body()).unwrap().to_string();
println!("{:#?}", res.headers());
println!("{}", str);
println!("{:#?}", res.status().to_string());

} ```

Build the module using the wasm32-wasi target, then execute in a Wasmtime runtime that has the experimental HTTP functionality enabled (the crate to configure it can be found in this repo):

wasi_experimental_http::data_from_memory:: length: 29 wasi_experimental_http::data_from_memory:: length: 41 wasi_experimental_http::data_from_memory:: length: 4 wasi_experimental_http::data_from_memory:: length: 53 wasi_experimental_http::write_guest_memory:: written 336 bytes wasi_experimental_http::write_guest_memory:: written 374 bytes { "content-length": "374", "connection": "keep-alive", "set-cookie": "sails.Path=/; HttpOnly", "vary": "Accept-Encoding", "content-type": "application/json; charset=utf-8", "date": "Fri, 26 Feb 2021 18:31:03 GMT", "etag": "W/\"176-Ky4OTmr3Xbcl3yNah8w2XIQapGU\"", } {"args":{},"data":"Testing with a request body. Does this actually work?","files":{},"form":{},"headers":{"x-forwarded-proto":"https","x-forwarded-port":"443","host":"postman-echo.com","x-amzn-trace-id":"Root=1-60393e67-02d1c8033bcf4f1e74a4523e","content-length":"53","content-type":"text/plain","abc":"def","accept":"*/*"},"json":null,"url":"https://postman-echo.com/post"} "200 OK"