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This branch updates `bytes` and `http-body` to the latest versions. The
`http-body` version that uses `bytes` 0.6 hasn't been released yet, so
we depend on it via a git dep for now. Presumably Hyper and `http-body`
will synchronize their releases.

Other than that, this is a pretty mechanical update. Should fix the
build and unblock the `h2` update to use vectored writes.
8 contributors

Users who have contributed to this file

@seanmonstar @srijs @weihanglo @tesaguri @tesuji @olehermanse @jolhoeft @hawkw
use bytes::Buf;
use futures_util::{stream, StreamExt};
use hyper::client::HttpConnector;
use hyper::service::{make_service_fn, service_fn};
use hyper::{header, Body, Client, Method, Request, Response, Server, StatusCode};
type GenericError = Box<dyn std::error::Error + Send + Sync>;
type Result<T> = std::result::Result<T, GenericError>;
static INDEX: &[u8] = b"<a href=\"test.html\">test.html</a>";
static INTERNAL_SERVER_ERROR: &[u8] = b"Internal Server Error";
static NOTFOUND: &[u8] = b"Not Found";
static POST_DATA: &str = r#"{"original": "data"}"#;
static URL: &str = "";
async fn client_request_response(client: &Client<HttpConnector>) -> Result<Response<Body>> {
let req = Request::builder()
.header(header::CONTENT_TYPE, "application/json")
let web_res = client.request(req).await?;
// Compare the JSON we sent (before) with what we received (after):
let before = stream::once(async {
"<b>POST request body</b>: {}<br><b>Response</b>: ",
let after = web_res.into_body();
let body = Body::wrap_stream(before.chain(after));
async fn api_post_response(req: Request<Body>) -> Result<Response<Body>> {
// Aggregate the body...
let whole_body = hyper::body::aggregate(req).await?;
// Decode as JSON...
let mut data: serde_json::Value = serde_json::from_reader(whole_body.reader())?;
// Change the JSON...
data["test"] = serde_json::Value::from("test_value");
// And respond with the new JSON.
let json = serde_json::to_string(&data)?;
let response = Response::builder()
.header(header::CONTENT_TYPE, "application/json")
async fn api_get_response() -> Result<Response<Body>> {
let data = vec!["foo", "bar"];
let res = match serde_json::to_string(&data) {
Ok(json) => Response::builder()
.header(header::CONTENT_TYPE, "application/json")
Err(_) => Response::builder()
async fn response_examples(
req: Request<Body>,
client: Client<HttpConnector>,
) -> Result<Response<Body>> {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") | (&Method::GET, "/index.html") => Ok(Response::new(INDEX.into())),
(&Method::GET, "/test.html") => client_request_response(&client).await,
(&Method::POST, "/json_api") => api_post_response(req).await,
(&Method::GET, "/json_api") => api_get_response().await,
_ => {
// Return 404 not found response.
async fn main() -> Result<()> {
let addr = "".parse().unwrap();
// Share a `Client` with all `Service`s
let client = Client::new();
let new_service = make_service_fn(move |_| {
// Move a clone of `client` into the `service_fn`.
let client = client.clone();
async {
Ok::<_, GenericError>(service_fn(move |req| {
// Clone again to ensure that client outlives this closure.
response_examples(req, client.to_owned())
let server = Server::bind(&addr).serve(new_service);
println!("Listening on http://{}", addr);