POST 404 errors (xhr_send) after deploying app

I’m trying to deploy a Meteor app to Google’s App Engine service, and after the app is up, I see dozens of errors like this in the browser console:

POST https://xx.appspot.com/sockjs/974/pavh0x2j/xhr_send 404 ()

What does this mean and how do I correct this?

I have the same issue after setting DISABLE_WEBSOCKETS to 1. Did you find a solution?

I’m using Meteor Up on Amazon EBS. I have a lot of these errors. Any ideas how to fix it?

[19/May/2019:17:08:34 +0000] "POST /sockjs/240/o7hc2hhz/xhr_send HTTP/1.1" 404 57 "" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"
[19/May/2019:17:08:36 +0000] "POST /sockjs/680/ar4x5udx/xhr_send HTTP/1.1" 404 57 "" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"
[19/May/2019:17:08:37 +0000] "POST /sockjs/343/dkc_y1r3/xhr_send HTTP/1.1" 404 57 "" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"
[19/May/2019:17:08:37 +0000] "POST /sockjs/112/7p4n4m3u/xhr_send HTTP/1.1" 404 57 "" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"
[19/May/2019:17:08:39 +0000] "POST /sockjs/187/4qicgh0a/xhr_send HTTP/1.1" 404 57 "" "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Safari/537.36"

Looks like it is always related to requests coming from Google.

Any suggestions?

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