23.2.3. 从基本 URL 创建新 URLs
join
方法从基路径和相对路径创建新的 URL。
use url::{Url, ParseError}; fn main() -> Result<(), ParseError> { let path = "/rust-lang/cargo"; let gh = build_github_url(path)?; assert_eq!(gh.as_str(), "https://github.com/rust-lang/cargo"); println!("The joined URL is: {}", gh); Ok(()) } fn build_github_url(path: &str) -> Result<Url, ParseError> { const GITHUB: &'static str = "https://github.com"; let base = Url::parse(GITHUB).expect("hardcoded URL is known to be valid"); let joined = base.join(path)?; Ok(joined) }