[Fix] Enable headless mode

@@ -11,8 +11,14 @@ async function login(id, pw) {
   try {
     //for visibility, headless: false
     const browser = await puppeteer.launch({
-      headless: false,
-      args: ["--window-size=1920,1080"],
+      headless: true,
+      args: [
+        "--window-size=1920x1080",
+        "--start-maximized",
+        "--no-sandbox",
+        "--disable-dev-shm-usage",
+        "--lang=ko",
+      ],
     });
 
     const page = await browser.newPage();
@@ -40,11 +46,12 @@ async function login(id, pw) {
       return false;
     } else {
       // 내 강의실
-      let selector =
-        "#visual > div > div.xn-main-login-container > div:nth-child(2) > div.xn-main-link-wrap.xn-main-lms-link-wrap > a";
-      await page.waitForSelector(selector);
-      await Promise.all([page.click(selector), page.waitForNavigation()]);
 
+      // let selector =
+      //   "#visual > div > div.xn-main-login-container > div:nth-child(2) > div.xn-main-link-wrap.xn-main-lms-link-wrap > a";
+      // await page.waitForSelector(selector);
+      // await Promise.all([page.click(selector), page.waitForNavigation()]);
+      await page.goto("https://khcanvas.khu.ac.kr/");
       return page;
     }
   } catch (err) {
@@ -55,7 +62,7 @@ async function login(id, pw) {
 //function that get your peed for your Ecampus calendar
 async function getPeed(page) {
   selector = "#global_nav_calendar_link > div.menu-item-icon-container > svg";
-  await page.waitForSelector(selector);
+  await page.waitForSelector(selector, { timeout: 1000 });
   await Promise.all([page.click(selector), page.waitForNavigation()]);
 
   selector = "#calendar-feed > button";

@@ -7,9 +7,14 @@ router.post("/", async (req, res) => {
   console.log(`listened /login ${req.body.id} ${req.body.pw}`);
   const page = await login(req.body.id, req.body.pw);
   if (page) {
+    try {
       const peed = await getPeed(page);
       res.send(peed);
-  } else res.send("failed");
+    } catch (e) {
+      console.log(e);
+      res.send("error");
+    }
+  } else res.send("login failed");
 });
 
 module.exports = router;

@@ -34,6 +34,7 @@ const Debug = () => {
         //result = login(state.input1, state.input2);
         break;
       case "server":
+        setState({ ...state, output: "loading..." });
         axios
           .post("http://localhost:3001/login/", {
             id: state.input1,