initial commit

.gitignore

+/target
+.idea

Cargo.toml

+[package]
+name = "http_echoserver"
+version = "0.1.0"
+authors = ["Stephen"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+warp = "0.2"
+serde = { version = "1.0", features = ["derive"] }
+tokio = { version = "0.2", features = ["macros"] }

rustfmt.toml

+tab_spaces = 4
+hard_tabs = true
\ No newline at end of file

src/main.rs

+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use warp::http::HeaderMap;
+use warp::Filter;
+
+#[derive(Serialize, Deserialize)]
+struct ResponseBody {
+	headers: HashMap<String, String>,
+}
+
+#[tokio::main]
+async fn main() {
+	let get_req = warp::path!("get")
+		.and(warp::header::headers_cloned())
+		.and_then(get_fn);
+
+	warp::serve(get_req).run(([127, 0, 0, 1], 3030)).await;
+}
+
+async fn get_fn(headers: HeaderMap) -> Result<impl warp::Reply, warp::Rejection> {
+	let headers: HashMap<String, String> = headers
+		.iter()
+		.map(|(name, value)| (name.to_string(), value.to_str().unwrap().to_string()))
+		.collect();
+	Ok(warp::reply::json(&ResponseBody { headers }))
+}