Now responding with http status codes. 404 when no queue is found, 202 when queue is empty.

src/main.rs

@@ -1,4 +1,4 @@
-use rocket::State;
+use rocket::{State, http::Status};
 use std::{sync::RwLock, collections::{VecDeque, HashMap}};
 
 #[derive(Debug)]
@@ -27,19 +27,23 @@ fn index() -> &'static str {
 
 
 #[get("/<id>")]
-fn get_by_id(id: &str, dumb_queue: &State<DumbQueue>) -> String {
+fn get_by_id(id: &str, dumb_queue: &State<DumbQueue>) -> Result<String, Status> {
     
     let queue_map = &dumb_queue.queue_map;
     let queues = &dumb_queue.queues;
-    match queue_map.read().unwrap().get(id) {
+    let map_reader = queue_map.read().unwrap();
+    match map_reader.get(id) {
         Some(i) => {
-            match queues.read().unwrap()[*i]
+            let index = *i;
+            drop(map_reader);
+    
+            match queues.read().unwrap()[index]
                     .write().unwrap().pop_front() {
-                Some(res) => return res,
-                None => String::from("")
+                Some(res) => Ok(res),
+                None => return Err(Status::NoContent)
             }
         }
-        None => String::from("")
+        None => return Err(Status::NotFound)
     }
 }