wasi-experimental-http

WebAssembly 的实验性 HTTP 库

使用该 crate

首先将此 crate 添加到您的项目中。然后，可以使用它创建并发送 HTTP 请求到服务器

use bytes::Bytes;
use http;
use wasi_experimental_http;

#[no_mangle]
pub extern "C" fn _start() {
    let url = "https://postman-echo.com/post".to_string();
    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_read_all()).unwrap().to_string();
    println!("{:#?}", res.header_get("Content-Type"));
    println!("{}", str);
    println!("{:#?}", res.status_code);
}

使用 wasm32-wasi 目标构建模块，然后在启用了实验性 HTTP 功能的 Wasmtime 运行时中执行（配置它的 crate 可以在此仓库中找到）

{
    "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"