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When the body type of a `Request` or `Response` implements `HttpBody`,
the `Request` or `Response` itself now implements `HttpBody`.

This allows writing things like `hyper::body::aggregate(req)` instead of

Closes #2067
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Users who have contributed to this file

@seanmonstar @tesuji @srijs @reem @tesaguri @renato-zannon @bluetech @frewsxcv @cyderize
use std::env;
use hyper::{body::HttpBody as _, Client};
use tokio::io::{self, AsyncWriteExt as _};
// A simple type alias so as to DRY.
type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
async fn main() -> Result<()> {
// Some simple CLI args requirements...
let url = match env::args().nth(1) {
Some(url) => url,
None => {
println!("Usage: client <url>");
return Ok(());
// HTTPS requires picking a TLS implementation, so give a better
// warning if the user tries to request an 'https' URL.
let url = url.parse::<hyper::Uri>().unwrap();
if url.scheme_str() != Some("http") {
println!("This example only works with 'http' URLs.");
return Ok(());
async fn fetch_url(url: hyper::Uri) -> Result<()> {
let client = Client::new();
let mut res = client.get(url).await?;
println!("Response: {}", res.status());
println!("Headers: {:#?}\n", res.headers());
// Stream the body, writing each chunk to stdout as we get it
// (instead of buffering and printing at the end).
while let Some(next) = {
let chunk = next?;