After login, modify global axios helper to include this token in all future requests

src/pages/Index.tsx

@@ -1,6 +1,6 @@
-import { A } from "@solidjs/router";
+import { A, useNavigate } from "@solidjs/router";
 import { createSignal, onMount, Show } from "solid-js";
-import { backend, UserInfo } from "../utils";
+import { backend, set_auth_token, UserInfo } from "../utils";
 import { Card } from "../components/Card";
 import { AxiosError } from "axios";
 
@@ -119,6 +119,7 @@ function UserRegistration(props: {setUserInfo: (u: UserInfo) => void}) {
             props.setUserInfo(response.data);
             localStorage.setItem(userIdKey, response.data.UserId);
             localStorage.setItem(usernameKey, response.data.Username);
+            set_auth_token(response.data.UserId);
         } catch (_e) {
             const e = _e as AxiosError<{error: string}>;
 
@@ -163,14 +164,27 @@ function UserRegistration(props: {setUserInfo: (u: UserInfo) => void}) {
 
 function LobbyConnection() {
     const [loading, setLoading] = createSignal(false);
+    const [error, setError] = createSignal("");
+    const navigate = useNavigate();
 
     const joinLobby = (ev: Event) => {
         ev.preventDefault();
     };
 
     const createLobby = async() => {
-        //
         setLoading(true);
+
+        try {
+            const res = await backend.post<{LobbyId: string}>("/lobby/new");
+            console.log(res.data);
+            // Redirect to the lobby component using the received lobby id
+            navigate(`/lobby/${res.data.LobbyId}`);
+        } catch (_e) {
+            const e: Error = _e as Error;
+            setError(e.message);
+        } finally {
+            setLoading(false);
+        }
     };
 
     return (
@@ -209,6 +223,7 @@ function LobbyConnection() {
                 Create a new lobby
             </button>
 
+            <p>{error()}</p>
         </div>
     );
 }

src/utils.ts

@@ -1,9 +1,21 @@
 import axios from "axios";
 
-export const backend = axios.create({
+export let backend = axios.create({
     baseURL: `${import.meta.env.VITE_BACKEND_URL}/api`,
+    headers: {
+        "Authorization": `Bearer ${localStorage.getItem("UserId") ?? ""}`,
+    },
 });
 
+export function set_auth_token(token: string) {
+    backend = axios.create({
+        baseURL: `${import.meta.env.VITE_BACKEND_URL}/api`,
+        headers: {
+            "Authorization": `Bearer ${token}`,
+        },
+    });
+}
+
 export type UserInfo = {
     UserId: string,
     Username: string,