updateCheck call stuck and returns 503 #1028

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Steps to Reproduce

Dont have an exact repro yet, but it happens frequently enough that we are becoming concerned and need to find the cause/resolution for this.

1. We call codePush.sync when our app boots which goes through the different statuses of: CHECKING_FOR_UPDATE, DOWNLOADING_PACKAGE, INSTALLING_UPDATE, UPDATE_TO_DATE.

2. However recently we've noticed that our users have been reporting that they are getting stuck on our update screen which is when we are doing the code push syncing. So we dug into the network calls and noticed that the call to check for update https://codepush.azurewebsites.net/updateCheck sometimes would get stuck for up to 1-2 minutes and then finally return 503 Service Unavailable.

Please advise on what may be causing this issue and also what are some suggested approaches to handle this. One idea we had internally was to have a timer that just times out and force skips the sync if the sync process exceeds a certain time limit. Would love to hear the team's thoughts.

Thanks for your help.

Environment

• react-native-code-push version: 2.1.0-beta
• react-native version: 0.44.3
• iOS/Android/Windows version:
• Does this reproduce on a debug build or release build?
• Does this reproduce on a simulator, or only on a physical device? On both simulator and physical device

(The more info the faster we will be able to address it!)