Cloudflare Developers•6mo ago

worker-rs: http hello world

use worker::*;

#[event(fetch)]
async fn fetch(
    _req: HttpRequest,
    _env: Env,
    _ctx: Context,
) -> Result<HttpResponse> {
    console_error_panic_hook::set_once();
    Ok(http::Response::builder()
        .status(http::StatusCode::OK)
        .body(Body::empty())?)
}

use worker::*;

#[event(fetch)]
async fn fetch(
    _req: HttpRequest,
    _env: Env,
    _ctx: Context,
) -> Result<HttpResponse> {
    console_error_panic_hook::set_once();
    Ok(http::Response::builder()
        .status(http::StatusCode::OK)
        .body(Body::empty())?)
}

How can I put a simple string into the body? Tried many ways but didn't work. The body seems to be only accepting a stream. (http feature flag enabled for worker-rs)

5 Replies

error_log•6mo ago

Response::ok("Hello, World!"), You should see example of using workers rs (https://github.com/cloudflare/workers-rs/blob/main/examples/, https://developers.cloudflare.com/workers/languages/rust/#3-write-your-worker-code)

Cloudflare Docs

Cloudflare Workers — Rust language support · Cloudflare Workers doc...

Write Workers in 100% Rust using the workers-rs crate

ChihweiOP•6mo ago

Thanks! Most of those examples are not with http feature flag turned on, which they are using older Response defined in worker-rs, rather than more widely used rust http crate. I later found I could change the wrapped type of Result to assign it a string, like Result<String>. I am a beginner of Rust, so let me know if I was wrong on anything.

Jeroen•3mo ago

I am pulling my hear out trying to figure out the same thing. Did you ever figure it out, @Chihwei?

ChihweiOP•3mo ago

@Jeroen

fn router() -> Router {
    Router::new()
        .route("/", get(root))
        .route("/zhiwei", get(zhiwei))
}

#[event(fetch)]
async fn fetch(
    req: HttpRequest,
    env: Env,
    ctx: Context,
) -> WorkerResult<axum::http::Response<axum::body::Body>> {
    console_error_panic_hook::set_once();
    Ok(router().call(req).await?)
}

pub async fn root() -> &'static str {
    "Hello World!"
}

pub async fn zhiwei() -> &'static str {
    "Hello Zhiwei!"
}

fn router() -> Router {
    Router::new()
        .route("/", get(root))
        .route("/zhiwei", get(zhiwei))
}

#[event(fetch)]
async fn fetch(
    req: HttpRequest,
    env: Env,
    ctx: Context,
) -> WorkerResult<axum::http::Response<axum::body::Body>> {
    console_error_panic_hook::set_once();
    Ok(router().call(req).await?)
}

pub async fn root() -> &'static str {
    "Hello World!"
}

pub async fn zhiwei() -> &'static str {
    "Hello Zhiwei!"
}

This is work I got, but I can't guarantee it's the most ideal way

Jeroen•3mo ago

ahhh yu're using axum, doesn't quite apply for me But I figured a few minutes ago that I can use a String as well, but I have to manually type the Response instead of using the built-in one I turned off the computer though, will try and remember to share for the next victim

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worker-rs: http hello world