web網(wǎng)頁(yè)-hello,world

extern crate iron; extern crate time;use iron::prelude::*; use iron::{BeforeMiddleware, AfterMiddleware, typemap}; use time::precise_time_ns;struct ResponseTime;impl typemap::Key for ResponseTime { type Value = u64; }impl BeforeMiddleware for ResponseTime {fn before(&self, req: &mut Request) -> IronResult<()> {req.extensions.insert::<ResponseTime>(precise_time_ns());Ok(())} }impl AfterMiddleware for ResponseTime {fn after(&self, req: &mut Request, res: Response) -> IronResult<Response> {let delta = precise_time_ns() - *req.extensions.get::<ResponseTime>().unwrap();println!("Request took: {} ms", (delta as f64) / 1000000.0);Ok(res)} }fn hello_world(_: &mut Request) -> IronResult<Response> {Ok(Response::with((iron::status::Ok, "Hello World"))) }fn main() {let mut chain = Chain::new(hello_world);chain.link_before(ResponseTime);chain.link_after(ResponseTime);Iron::new(chain).http("localhost:3000").unwrap(); } Cargo.toml [package] name = "learnrust6" version = "0.1.0" authors = ["spxai <lx@myhaspl.com>"] edition = "2018"# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html[dependencies] iron = "0.6.1" time = "0.2.26"

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