特性‘`std：：未来:未来’不是为`std::result::Result<reqwest::Response，reqwest::Error>`实现的

Question

我正在尝试运行basic reqwest 示例

extern crate reqwest;
extern crate tokio;

#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
    let res = reqwest::Client::new()
        .get("https://hyper.rs")
        .send()
        .await?;

    println!("Status: {}", res.status());

    let body = res.text().await?;

    println!("Body:\n\n{}", body);

    Ok(())
}

我得到的错误：

   --> src/main.rs:6:15
    |
6   |       let res = reqwest::Client::new()
    |  _______________^
7   | |         .get("https://hyper.rs")
8   | |         .send()
9   | |         .await?;
    | |______________^ the trait `std::future::Future` is not implemented for `std::result::Result<reqwest::Response, reqwest::Error>`

生锈版：rustc 1.39.0 (4560ea788 2019-11-04)

图书馆版本：

reqwest = "0.9.22"
tokio = { version = "0.2.0-alpha.6", features = ["full"] }

有人知道这是怎么回事吗？

Answer 1

与这里相同的问题正好相反。您使用的是reqwest-0.9，默认情况下它使用阻塞接口。更新到reqwest-0.10以获得异步接口。

如果不能更新到reqwest-0.10，则reqwest-0.9中的异步接口在reqwest::async中。例如reqwest::async::Client::new(...)。