rust reqwest有哪些常见用法

reqwest 是一个用于 Rust 的强大 HTTP 客户端库，它允许你轻松地进行 HTTP 请求。以下是 reqwest 的一些常见用法：

1. 发送 GET 请求：

use reqwest::Error;

async fn get_request() -> Result<String, Error> {
    let response = reqwest::get("https://api.example.com/data")
        .await?
        .text()
        .await?;
    Ok(response)
}

2. 发送 POST 请求：

use reqwest::{Client, Error};
use serde_json::json;

async fn post_request() -> Result<String, Error> {
    let client = Client::new();
    let data = json!({
        "key": "value",
    });

    let response = client.post("https://api.example.com/data")
        .json(&data)
        .send()
        .await?
        .text()
        .await?;
    Ok(response)
}

3. 添加请求头：

use reqwest::Error;

async fn request_with_headers() -> Result<String, Error> {
    let client = Client::new();
    let response = client.get("https://api.example.com/data")
        .header("Authorization", "Bearer your_token")
        .header("Custom-Header", "custom_value")
        .send()
        .await?
        .text()
        .await?;
    Ok(response)
}

4. 超时设置：

use reqwest::Error;
use std::time::Duration;

async fn request_with_timeout() -> Result<String, Error> {
    let client = Client::builder()
        .timeout(Duration::from_secs(5))
        .build()?;

    let response = client.get("https://api.example.com/data")
        .send()
        .await?
        .text()
        .await?;
    Ok(response)
}

5. 错误处理：

use reqwest::Error;

async fn handle_error() {
    match reqwest::get("https://api.example.com/data")
        .await
    {
        Ok(response) => {
            if response.status().is_success() {
                let body = response.text().await?;
                println!("Success! Body: {}", body);
            } else {
                eprintln!("Error: {}", response.status());
            }
        }
        Err(e) => eprintln!("Request failed: {}", e),
    }
}

6. 同步请求（不推荐）：

use reqwest::Error;

fn sync_request() -> Result<String, Error> {
    let response = reqwest::get("https://api.example.com/data")
        .send()?
        .text()?;
    Ok(response)
}

这些示例展示了如何使用 reqwest 库执行基本的 HTTP 请求。你可以根据自己的需求进行调整，例如使用不同的 HTTP 方法、处理响应数据等。