Question

我想用Hyper来制作HTTP请求。调用Client::get可以正常工作，但Client::post和Client::head等其他方法会导致编译错误。

extern crate futures;
extern crate hyper;
extern crate tokio_core;

use std::io::{self, Write};
use futures::{Future, Stream};
use hyper::Client;
use tokio_core::reactor::Core;

fn main() {
    let mut core = Core::new().unwrap();
    let client = Client::new(&core.handle());

    let uri = "http://httpbin.org/ip".parse().unwrap();
    let work = client.post(uri).and_then(|res| {
        // if post changed to get it will work correctly
        println!("Response: {}", res.status());

        res.body("x=z")
            .for_each(|chunk| io::stdout().write_all(&chunk).map_err(From::from))
    });
    core.run(work).unwrap();
}

错误：

error[E0599]: no method named `post` found for type `hyper::Client<hyper::client::HttpConnector>` in the current scope
  --> src/main.rs:15:23
   |
15 |     let work = client.post(uri).and_then(|res| {
   |                       ^^^^

error[E0277]: the trait bound `[u8]: std::marker::Sized` is not satisfied
  --> src/main.rs:20:24
   |
20 |             .for_each(|chunk| io::stdout().write_all(&chunk).map_err(From::from))
   |                        ^^^^^ `[u8]` does not have a constant size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `[u8]`
   = note: all local variables must have a statically known size

Answer 1

错误消息没有秘密诡计。您收到错误“找不到类型为post 的hyper::Client的方法”，因为没有这样的方法。

如果您查看Client的文档，则可以查看其拥有的所有方法。它们都不是post。

相反，您需要使用Client::request并传入Request值。 Request的构造函数接受Method表示要使用的HTTP方法。

use hyper::{Client, Request, Method};

fn main() {
    // ...

    let uri = "http://httpbin.org/ip".parse().unwrap();
    let req = Request::new(Method::Post, uri);

    let work = client.request(req).and_then(|res| {
        // ...
    });
}

crate documentation说：

如果刚刚开始，首先查看Guides 。

确切地说明了您的案例指南：Advanced Client Usage。

在Hyper 0.11中没有为类型`hyper :: Client`找到名为`post`的方法

1 个答案: