请求处理

Make a HTTP GET request

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Parses the supplied URL and makes a synchronous HTTP GET request with reqwest::blocking::get. Prints obtained reqwest::blocking::Response status and headers. Reads HTTP response body into an allocated String using read_to_string.

use error_chain::error_chain;
use std::io::Read;

error_chain! {
    foreign_links {
        Io(std::io::Error);
        HttpRequest(reqwest::Error);
    }
}

fn main() -> Result<()> {
    let mut res = reqwest::blocking::get("http://httpbin.org/get")?;
    let mut body = String::new();
    res.read_to_string(&mut body)?;

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

    Ok(())
}

Async

A similar approach can be used by including the tokio executor to make the main function asynchronous, retrieving the same information.

In this example, tokio::main handles all the heavy executor setup and allows sequential code implemented without blocking until .await.

Uses the asynchronous versions of reqwest, both reqwest::get and reqwest::Response.

use error_chain::error_chain;

error_chain! {
    foreign_links {
        Io(std::io::Error);
        HttpRequest(reqwest::Error);
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    let res = reqwest::get("http://httpbin.org/get").await?;
    println!("Status: {}", res.status());
    println!("Headers:\n{:#?}", res.headers());

    let body = res.text().await?;
    println!("Body:\n{}", body);
    Ok(())
}