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? It returns a Bytes object which you can deref into a &[u8], which you can then interpret as utf-8. — justinas
– justinas, Commented Aug 7, 2020 at 12:34
I would also suggest reqwest if you'd prefer ease of use over fine-grained control of hyper. — justinas
– justinas, Commented Aug 7, 2020 at 12:35

cobbzilla · Accepted Answer · 2020-09-06 02:13:16Z

9

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 6, 2020 at 2:13

cobbzilla

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1 Comment

Daniele Cruciani Over a year ago

hyper::body::to_bytes() removed in 1.0, req.collect().await?.to_bytes(); works. (to_bytes() is now unfallible)

nomad · Accepted Answer · 2020-08-07 12:55:03Z

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 7, 2020 at 12:55

nomad

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2 Comments

nomad Over a year ago

even though it surely can be solved in a better way.

Alice Ryhl Over a year ago

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.

Patrick · Accepted Answer · 2024-05-27 08:16:42Z

-1

As of hyper 1, you can simply do

let contents: String = response.into_body().try_into().expect("oh no");

edited May 27, 2024 at 8:16

answered May 27, 2024 at 8:08

Patrick

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