Intermittent slow uploads to S3 using pre-signed URLs

💬 App Building
1

  • Goal: I have a Retool app for my customer support team to upload documents to S3. The upload process first calls one of our backend APIs to get a pre-signed S3 URL, and then uploads the file by calling a Rest API Resource with the URL set to the pre-signed S3 URL. We are seeing intermittently slow uploads; e.g. 3MB file taking 20s to upload.

  • Steps: I tried changing our routing to go through Retool EU (since most my CS team is located in MENA). I set a 8000ms timeout on the REST API query, but seems like the query ignores that.

  • Details: Cloud-hosted version of Retool

I have a couple questions:

  1. How does Retool handle Rest API resource queries? Does Retool proxy these requests as well, or is it a direct API call?
  2. Would switching to the Amazon S3 Resource produce more consistent performance?
  3. I have an HAR that my teammate recorded, is there a way I can share that? That might give more insights into the issue.