Add server.rs example to the examples section

examples/server.rs

@@ -0,0 +1,38 @@
+extern crate tungstenite;
+
+use std::thread::spawn;
+use std::net::TcpListener;
+
+use tungstenite::accept;
+use tungstenite::handshake::server::Request;
+
+fn main() {
+    let server = TcpListener::bind("127.0.0.1:3012").unwrap();
+    for stream in server.incoming() {
+        spawn(move || {
+            let callback = |req: &Request| {
+                println!("Received a new ws handshake");
+                println!("The request's path is: {}", req.path);
+                println!("The request's headers are:");
+                for &(ref header, _ /* value */) in req.headers.iter() {
+                    println!("* {}", header);
+                }
+
+                // Let's add an additional header to our response to the client.
+                let extra_headers = vec![
+                    (String::from("MyCustomHeader"), String::from(":)")),
+                    (String::from("SOME_TUNGSTENITE_HEADER"), String::from("header_value")),
+                ];
+                Ok(Some(extra_headers))
+            };
+            let mut websocket = accept(stream.unwrap(), Some(Box::new(callback))).unwrap();
+
+            loop {
+                let msg = websocket.read_message().unwrap();
+                if msg.is_binary() || msg.is_text() {
+                    websocket.write_message(msg).unwrap();
+                }
+            }
+        });
+    }
+}