How to read the response body as a string in Rust Hyper?

Question

This question has several answers (here, here, and here), but none of them worked for me :(

What I've tried so far:


    use hyper as http;
    use futures::TryStreamExt;

    fn test_heartbeat() {
        let mut runtime = tokio::runtime::Runtime::new().expect("Could not get default runtime");

        runtime.spawn(httpserve());

        let addr = "http://localhost:3030".parse().unwrap();
        let expected = json::to_string(&HeartBeat::default()).unwrap();

        let client = http::Client::new();
        let actual = runtime.block_on(client.get(addr));

        assert!(actual.is_ok());

        if let Ok(response) = actual {
            let (_, body) = response.into_parts();
            
            // what shall be done here? 
        }
    }

I am not sure, what to do here?

Have you tried [to_bytes](https://docs.rs/hyper/0.13.7/hyper/body/fn.to_bytes.html)? It returns a `Bytes` object which you can deref into a `&[u8]`, which you can then [interpret as utf-8](https://doc.rust-lang.org/std/str/fn.from_utf8.html). — justinas, Aug 07 '20 at 12:34
I would also suggest [reqwest](https://crates.io/crates/reqwest) if you'd prefer ease of use over fine-grained control of hyper. — justinas, Aug 07 '20 at 12:35

score 6 · Answer 1 · answered Sep 06 '20 at 02:13

6

This worked for me (using hyper 0.2.1):

async fn body_to_string(req: Request<Body>) -> String {
    let body_bytes = hyper::body::to_bytes(req.into_body()).await?;
    String::from_utf8(body_bytes.to_vec()).unwrap()
}

answered Sep 06 '20 at 02:13

cobbzilla

1,920
1
16
17

score 3 · Accepted Answer · answered Aug 07 '20 at 12:55

3

According to justinas the answer is:

// ...
let bytes = runtime.block_on(hyper::body::to_bytes(body)).unwrap();
let result = String::from_utf8(bytes.into_iter().collect()).expect("");

answered Aug 07 '20 at 12:55

nomad

131
1
8

even though it surely can be solved in a better way. – nomad Aug 07 '20 at 12:55
Note that if you are already inside async code, you should replace the `runtime.block_on` part with an `.await` like seen in the other answer. – Alice Ryhl Jan 10 '21 at 10:28

How to read the response body as a string in Rust Hyper?

2 Answers2