反序列化 reqwest 响应时找不到 json 方法

Question

我对 Rust 很陌生，我似乎无法找到解决这个问题的方法。我正在尝试以 json 形式获取 get 请求的响应。

#[macro_use]
extern crate serde;
extern crate serde_derive;
extern crate reqwest;
use reqwest::Error;

fn main(){
    #[derive(Deserialize)]

struct Ip {
    origin: String,
}

let json: Ip = reqwest::get("http://httpbin.org/ip").json();
//reqwest::get("http://httpbin.org/ip")?.json()?;
}

这里是 cargo.toml

[dependencies]
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
serde_derive = "1.0"
reqwest = { version = "0.10", features = ["blocking"] }

我不断收到的错误是

另外， 如果我使用

reqwest::get("http://httpbin.org/ip")?.json()?;

（添加问号） 我收到另一个错误提示

cannot use the `?` operator in a function that returns `()`
this function should return `Result` or `Option` to accept `?`

我该如何解决这些问题？

Answer 1

根据doc，您需要在Cargo.toml 中启用json reqwest 功能：

reqwest = { version = "0.10", features = ["blocking", "json"] }

另外，reqwest::get 是async API 的一部分。由于您的main 是同步的，因此您需要reqwest::blocking::get