feat: Axios instance 추가

frontend/src/utils/axios/instance.js

@@ -0,0 +1,41 @@
+import axios from 'axios';
+
+const ACCESS_TOKEN_KEY = import.meta.env.VITE_ACCESS_TOKEN_KEY;
+
+const instance = axios.create({
+  baseURL: import.meta.env.VITE_API_URL,
+  timeout: 1000,
+  headers: { 'X-Custom-Header': 'foobar' },
+});
+
+instance.interceptors.request.use((config) => {
+  const accessToken = sessionStorage.getItem(ACCESS_TOKEN_KEY);
+
+  if (accessToken) {
+    config.headers.Authorization = `Bearer ${accessToken}`;
+  }
+
+  return config;
+});
+
+instance.interceptors.response.use(
+  (response) => response,
+  (error) => {
+    if (error.response.status !== 401) {
+      return Promise.reject(error);
+    }
+
+    // TODO: api url update
+    const REFRESH_API_URL = '/refresh-token';
+
+    return instance.post(REFRESH_API_URL).then((response) => {
+      const { accessToken } = response.data;
+
+      sessionStorage.setItem(ACCESS_TOKEN_KEY, accessToken);
+      error.config.headers.Authorization = `Bearer ${accessToken}`;
+      return instance(error.config);
+    });
+  }
+);
+
+export default instance;