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Rust Cookbook

    Making Requests

    Make a HTTP GET request

    [![reqwest-badge]][reqwest] [![cat-net-badge]][cat-net]

    Parses the supplied URL and makes a synchronous HTTP GET requestwithreqwest::blocking::get. Prints obtainedreqwest::blocking::Responsestatus and headers. Reads HTTP response body into an allocatedStringusingread_to_string.

    use anyhow::Result;use std::io::Read;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 thetokio executorto make the main function asynchronous, retrieving the same information.Make sure to add tokio = {version = "1.21.2", features = ["full"]} toyour cargo.toml file.

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

    Uses the asynchronous versions of [reqwest], bothreqwest::get andreqwest::Response.

    use anyhow::Result;#[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(())}

    Set custom headers and URL parameters for a REST request

    [![reqwest-badge]][reqwest] [![serde-badge]][serde] [![url-badge]][url] [![cat-net-badge]][cat-net]

    Sets both standard and custom HTTP headers as well as URL parameters for a HTTPGET request. Creates a custom header of typeXPoweredBy with [header!] macro.

    Then, builds the complex URL with [Url::parse_with_params]. Sets standardheaders [header::USER_AGENT], [header::AUTHORIZATION] and customXPoweredBy header using [RequestBuilder::header], then makes the requestwith [RequestBuilder::send].

    The request targethttp://httpbin.org/headers responds witha JSON dict containing all request headers for easy verification.

    use anyhow::Result;use reqwest::Url;use reqwest::blocking::Client;use reqwest::header::USER_AGENT;use serde::Deserialize;use std::collections::HashMap;#[derive(Deserialize, Debug)]pub struct HeadersEcho {    pub headers: HashMap<String, String>,}fn main() -> Result<()> {    let url = Url::parse_with_params(        "http://httpbin.org/headers",        &[("lang", "rust"), ("browser", "servo")],    )?;    let response = Client::new()        .get(url)        .header(USER_AGENT, "Rust-test-agent")        .header("X-Powered-By", "Rust")        .send()?;    assert_eq!(        response.url().as_str(),        "http://httpbin.org/headers?lang=rust&browser=servo"    );    let out: HeadersEcho = response.json()?;    assert_eq!(out.headers["User-Agent"], "Rust-test-agent");    assert_eq!(out.headers["X-Powered-By"], "Rust");    Ok(())}[`header::USER_AGENT`]: https://docs.rs/reqwest/*/reqwest/header/constant.USER_AGENT.html[`RequestBuilder::HeaderName::TryFrom<&'a str>`]: https://docs.rs/reqwest/*/reqwest/header/struct.HeaderName.html#impl-TryFrom%3C%26%27a%20str%3E[`RequestBuilder::send`]: https://docs.rs/reqwest/*/reqwest/struct.RequestBuilder.html#method.send[`Url::parse_with_params`]: https://docs.rs/url/*/url/struct.Url.html#method.parse_with_params<!--Links, in a few categories. 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