SignatureDoesNotMatch PUT-ing to SignedUrl using ActiveStorage

Posted May 25, 2021 38 views
Ruby on Rails


I am currently trying to implement an image upload feature within the application I’m working on and trying to take advantage of Rails ActiveStorage and DigitalOcean Spaces.

I am generating a presigned-url from ActiveStorage and from that URL I am trying to test an upload with it using Postman.

My config/storage.yml file looks like so:

  service: S3
  access_key_id: XXXX
  secret_access_key: XXXX
  region: nyc3
  bucket: XXXX
  public: true

I have updated the config/environments/development.rb file to use this service

config.active_storage.service = :digital_ocean

Since I am trying to get this to work on development first I have used s3cmd to configure CORS for my Space.




Using Postman, I POST to an endpoint within my application to generate a presigned-url which gets returned.

The idea is that the front-end portion of my application would PUT to this URL.

I then try to PUT to it, setting the binary to a file I wish to upload, each time I submit, I get the following 403 Forbidden back:

<?xml version="1.0" encoding="UTF-8"?>

Any and all help would be greatly appreciated

Thanks in advance

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