23.5.1.2. 为 REST 请求设置自定义消息标头和 URL 参数
本实例中为 HTTP GET 请求设置标准的和自定义的 HTTP 消息标头以及 URL 参数。使用 hyper::header!
宏创建 XPoweredBy
类型的自定义消息标头。
使用 Url::parse_with_params
构建复杂的 URL。使用 RequestBuilder::header
方法设置标准消息标头 header::UserAgent
、header::Authorization
,以及自定义类型 XPoweredBy
,然后使用 RequestBuilder::send
发起请求。
请求的服务目标为 http://httpbin.org/headers,其响应结果是包含所有请求的消息标头的 JSON 字典,易于验证。
use error_chain::error_chain; use serde::Deserialize; use std::collections::HashMap; use url::Url; use reqwest::Client; use reqwest::header::{UserAgent, Authorization, Bearer}; header! { (XPoweredBy, "X-Powered-By") => [String] } #[derive(Deserialize, Debug)] pub struct HeadersEcho { pub headers: HashMap<String, String>, } error_chain! { foreign_links { Reqwest(reqwest::Error); UrlParse(url::ParseError); } } fn main() -> Result<()> { let url = Url::parse_with_params("http://httpbin.org/headers", &[("lang", "rust"), ("browser", "servo")])?; let mut response = Client::new() .get(url) .header(UserAgent::new("Rust-test")) .header(Authorization(Bearer { token: "DEadBEEfc001cAFeEDEcafBAd".to_owned() })) .header(XPoweredBy("Guybrush Threepwood".to_owned())) .send()?; let out: HeadersEcho = response.json()?; assert_eq!(out.headers["Authorization"], "Bearer DEadBEEfc001cAFeEDEcafBAd"); assert_eq!(out.headers["User-Agent"], "Rust-test"); assert_eq!(out.headers["X-Powered-By"], "Guybrush Threepwood"); assert_eq!(response.url().as_str(), "http://httpbin.org/headers?lang=rust&browser=servo"); println!("{:?}", out); Ok(()) }