面试题：Rust中reqwest库API调用的复杂场景

Question

使用reqwest库向一个需要身份验证（Bearer Token）的API发送POST请求，请求体为JSON格式的数据。假设API地址为'https://secure - api.com/api/post'，Token为'your - token - here'，JSON数据结构为{"key":"value"}，请编写完整的Rust代码实现，同时要妥善处理异步操作和错误处理。

Answer 1

use reqwest::Client;
use serde::{Deserialize, Serialize};
use std::error::Error;

#[derive(Serialize)]
struct RequestBody {
    key: String,
}

#[derive(Deserialize)]
struct ResponseBody {
    // 根据实际API响应结构定义
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let client = Client::new();
    let token = "your - token - here";
    let url = "https://secure - api.com/api/post";

    let request_body = RequestBody {
        key: "value".to_string(),
    };

    let response = client
      .post(url)
      .bearer_auth(token)
      .json(&request_body)
      .send()
      .await?;

    if response.status().is_success() {
        let response_body: ResponseBody = response.json().await?;
        println!("Response: {:?}", response_body);
    } else {
        println!("Request failed with status: {}", response.status());
    }

    Ok(())
}