Parse Server on Heroku logs many "H28 Client Connection Idle" warnings

[mtrezza]

With Parse Server deployed on Heroku I see quite a few warnings from the Heroku router: H28 Client Connection Idle. The server is the API endpoint for an iOS app.

According to Heroku docs this warning occurs when:

The client did not send a full request and was terminated due to 55 seconds of inactivity. For example, the client indicated a Content-Length of 50 bytes which were not sent in time.

Can this possibly be an issue with the Parse iOS SDK?
Has anyone else experienced this?

Update:
I was able to track this down to a single request type to a specific class. So I guess this is just something in the app logic. I will further investigate this and update here.

[mtrezza]

Cause seemed to be a performance issue. Upscaled the dynos in Heroku and reduced the number of H28s.

[alexblack]

Hi @mtrezza, we're seeing this too and wondered if you had any more insights to share.

[mtrezza]

Hi @alexblack, I can't remember anymore but I'd first check cloud code, maybe even remove cloud code and see if you still have these errors.

[woodardj]

Hey @mtrezza — any chance you can elaborate? We see a lot of these as well, do you mean that the quantity of Cloud Code functions you have is causing issues? Or just disabling it altogether?

[mtrezza]

@woodardj it seemed to be a Heroku performance related issue. Upscaling the dynos in Heroku reduced the number of H28s.