Fix error handling when refreshing

view-train.js

@@ -193,22 +193,36 @@ function onTrainData(data) {
 
 var refreshStopToken = null
 function refresh() {
-	return fetch(`https://scraper.infotren.dcdev.ro/v2/train/${trainNumber}?date=${date.getFullYear().toString()}-${(date.getMonth() + 1).toString().padStart(2, "0")}-${date.getDate().toString().padStart(2, "0")}`)
-		.then(function (response) {
-			return response.json()
-		})
-		.then(function (response) {
-			trainData = response
-			onTrainData(response)
-		})
-		.then(function () {
-			if (refreshStopToken != null) {
-				clearTimeout(refreshStopToken)
-			}
-			refreshStopToken = setTimeout(function () { 
-				refresh()
-			}, 60000)
-		})
+	function reschedule(timeout) {
+		if (refreshStopToken != null) {
+			clearTimeout(refreshStopToken)
+		}
+		refreshStopToken = setTimeout(function () { 
+			refresh()
+		}, timeout || 60000)
+	}
+	return fetch(
+		`https://scraper.infotren.dcdev.ro/v2/train/${trainNumber}?date=${date.getFullYear().toString()}-${(date.getMonth() + 1).toString().padStart(2, "0")}-${date.getDate().toString().padStart(2, "0")}`,
+		{
+			cache: 'no-store',
+		},
+	).then(function (response) {
+		if (!response.ok) {
+			// Check in 10 seconds if server returned error
+			reschedule(10000)
+			return
+		}
+		return response.json()
+	}).then(function (response) {
+		trainData = response
+		onTrainData(response)
+	}).then(function () {
+		reschedule()
+	}).catch(function (e) {
+		// Check in 1 second if network error
+		reschedule(1000)
+		throw e
+	})
 }
 
 window.addEventListener('unload', function (e) {