Updates http2 chapter after testing.

examples/http2/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "http2"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+actix-web = { version = "1.0", features = ["ssl"] }
+openssl = { version = "0.10", features = ["v110"] }

examples/http2/src/main.rs

@@ -0,0 +1,25 @@
+// <main>
+use actix_web::{web, App, HttpRequest, HttpServer, Responder};
+use openssl::ssl::{SslAcceptor, SslFiletype, SslMethod};
+
+fn index(_req: HttpRequest) -> impl Responder {
+    "Hello."
+}
+
+fn main() {
+    // load ssl keys
+    // to create a self-signed temporary cert for testing:
+    // `openssl req -x509 -newkey rsa:4096 -nodes -keyout key.pem -out cert.pem -days 365 -subj '/CN=localhost'`
+    let mut builder = SslAcceptor::mozilla_intermediate(SslMethod::tls()).unwrap();
+    builder
+        .set_private_key_file("key.pem", SslFiletype::PEM)
+        .unwrap();
+    builder.set_certificate_chain_file("cert.pem").unwrap();
+
+    HttpServer::new(|| App::new().route("/", web::get().to(index)))
+        .bind_ssl("127.0.0.1:8088", builder)
+        .unwrap()
+        .run()
+        .unwrap();
+}
+// </main>