Скачать или смотреть Troubleshooting ERR_CONNECTION_RESET in AWS S3 Presigned POST Requests

Discover how to overcome the `ERR_CONNECTION_RESET` error when using AWS S3 Presigned POST URLs, with troubleshooting steps and solutions.
---
This video is based on the question https://stackoverflow.com/q/71596706/ asked by the user 'themetzmeier' ( https://stackoverflow.com/u/13530503/ ) and on the answer https://stackoverflow.com/a/71656223/ provided by the user 'themetzmeier' ( https://stackoverflow.com/u/13530503/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: AWS S3 PresignedPost works locally but fails in production with ERR_CONNECTION_RESET

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting ERR_CONNECTION_RESET in AWS S3 Presigned POST Requests

When working with AWS S3 and building file upload features in your applications, encountering errors can be frustrating. One common issue developers face is the ERR_CONNECTION_RESET error during the file upload process using presigned POST URLs. In this guide, we'll explore this problem, dive into a potential solution, and guide you step-by-step to help you avoid similar pitfalls in the future.

The Problem

You have successfully set up your backend using AWS Lambda to create presigned POST URLs for uploading files to an S3 bucket. Locally, everything works seamlessly, but when deployed to production, attempting to upload files throws the ERR_CONNECTION_RESET error. This indicates that the connection could not be established or was interrupted for some reason.

The Setup

Here's a brief look at the code involved in generating the presigned POST URL before we explore the issues:

[[See Video to Reveal this Text or Code Snippet]]

The Error

In the frontend, you execute the POST request and receive the error every time:

[[See Video to Reveal this Text or Code Snippet]]

This line triggers the ERR_CONNECTION_RESET error.

The Solution

After thoroughly troubleshooting the issue, the solution turned out to be related to the configuration of the AWS SDK for JavaScript. Specifically, the issue arose from not correctly setting the AWS region before initializing the S3 instance.

Step 1: Update AWS Configuration

You need to ensure that the configuration is set before you create the S3 instance. Here's how you should do it:

Bad Configuration

This is what the incorrect order looked like in the original code:

[[See Video to Reveal this Text or Code Snippet]]

Good Configuration

To fix it, update the configuration first before creating the S3 variable:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Verify Region Compatibility

Ensure that the S3 bucket you're uploading to is in the same region as specified in your configuration. Any mismatch can lead to connection errors, including ERR_CONNECTION_RESET.

Conclusion

By paying close attention to the order of operations when configuring the AWS SDK, many connection issues, such as ERR_CONNECTION_RESET, can be resolved. Remember to always configure the SDK before your instance creation to prevent similar headaches down the line.

Don't underestimate the importance of configuration order—it can save you hours of debugging!

If you've encountered this error or have any other AWS-related challenges, feel free to share your experiences in the comments below!