First pass at Handlers chapter.

examples/responder-trait/Cargo.toml

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+[package]
+name = "responder-trait"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+actix-web = "1.0"
+serde = "1.0"
+serde_json = "1.0"

examples/responder-trait/src/main.rs

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+// <main>
+use actix_web::{web, App, Error, HttpRequest, HttpResponse, HttpServer, Responder};
+use serde::Serialize;
+use serde_json;
+
+#[derive(Serialize)]
+struct MyObj {
+    name: &'static str,
+}
+
+// Responder
+impl Responder for MyObj {
+    type Error = Error;
+    type Future = Result<HttpResponse, Error>;
+
+    fn respond_to(self, _req: &HttpRequest) -> Self::Future {
+        let body = serde_json::to_string(&self)?;
+
+        // Create response and set content type
+        Ok(HttpResponse::Ok()
+            .content_type("application/json")
+            .body(body))
+    }
+}
+
+fn index(_req: HttpRequest) -> impl Responder {
+    MyObj { name: "user" }
+}
+
+fn main() {
+    HttpServer::new(|| App::new().route("/", web::get().to(index)))
+        .bind("127.0.0.1:8088")
+        .unwrap()
+        .run()
+        .unwrap();
+}
+// </main>