Can Reqwest be used with proxy servers?

Yes, Reqwest, a popular HTTP client library for Rust, can be used with proxy servers. You can configure the Reqwest client to route your requests through a specified proxy. This is especially useful when you need to scrape web data without revealing your actual IP address or when you're trying to access web resources that are geo-restricted.

To use a proxy with Reqwest, you need to create a Proxy instance and then pass it to the ClientBuilder when constructing a Client. Here's an example of how you can use Reqwest with an HTTP proxy:

use reqwest::Client;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let proxy = reqwest::Proxy::http("http://your-proxy-server:port")?;
    let client = Client::builder()
        .proxy(proxy)
        .build()?;

    let res = client.get("http://httpbin.org/ip")
        .send()
        .await?;

    println!("Status: {}", res.status());
    println!("Headers:\n{:#?}", res.headers());
    Ok(())
}

If you need to use an HTTPS proxy, you can use the https method:

let proxy = reqwest::Proxy::https("https://your-proxy-server:port")?;

For proxies that require authentication, you can include the credentials in the proxy URL:

let proxy = reqwest::Proxy::http("http://username:password@your-proxy-server:port")?;

Reqwest also supports using a system proxy by default. If you don't specify a proxy, Reqwest will try to use the HTTP_PROXY and HTTPS_PROXY environment variables if they are set.

Remember that while using proxies can be beneficial for web scraping and privacy, it's important to ensure you're complying with the terms of service of the websites you're scraping and that your actions are legal in your jurisdiction.