5d3c472228
**The `Error` is now an opaque struct**, which allows for more variants to be added freely, and the internal representation to change without being breaking changes. For inspecting an `Error`, there are several `is_*` methods to check for certain classes of errors, such as `Error::is_parse()`. The `cause` can also be inspected, like before. This likely seems like a downgrade, but more inspection can be added as needed! The `Error` now knows about more states, which gives much more context around when a certain error occurs. This is also expressed in the description and `fmt` messages. **Most places where a user would provide an error to hyper can now pass any error type** (`E: Into<Box<std::error::Error>>`). This error is passed back in relevant places, and can be useful for logging. This should make it much clearer about what error a user should provide to hyper: any it feels is relevant! Closes #1128 Closes #1130 Closes #1431 Closes #1338 BREAKING CHANGE: `Error` is no longer an enum to pattern match over, or to construct. Code will need to be updated accordingly. For body streams or `Service`s, inference might be unable to determine what error type you mean to return. Starting in Rust 1.26, you could just label that as `!` if you never return an error.
54 lines
1.3 KiB
Rust
54 lines
1.3 KiB
Rust
//#![deny(warnings)]
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extern crate futures;
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extern crate hyper;
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extern crate tokio;
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extern crate pretty_env_logger;
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use std::env;
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use std::io::{self, Write};
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use futures::{Future, Stream};
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use futures::future::lazy;
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use hyper::{Body, Client, Request};
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fn main() {
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pretty_env_logger::init();
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let url = match env::args().nth(1) {
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Some(url) => url,
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None => {
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println!("Usage: client <url>");
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return;
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}
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};
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let url = url.parse::<hyper::Uri>().unwrap();
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if url.scheme_part().map(|s| s.as_ref()) != Some("http") {
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println!("This example only works with 'http' URLs.");
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return;
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}
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tokio::run(lazy(move || {
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let client = Client::default();
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let mut req = Request::new(Body::empty());
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*req.uri_mut() = url;
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client.request(req).and_then(|res| {
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println!("Response: {}", res.status());
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println!("Headers: {:#?}", res.headers());
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res.into_body().into_stream().for_each(|chunk| {
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io::stdout().write_all(&chunk)
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.map_err(|e| panic!("example expects stdout is open, error={}", e))
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})
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}).map(|_| {
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println!("\n\nDone.");
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}).map_err(|err| {
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eprintln!("Error {}", err);
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})
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}));
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}
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