Unable to save file to Amazon S3 when using carrierwave - upload

Question

SEE UPDATE BELOW!
I am having problems after I upload an image file to Amazon S3 and then try to save the file.
I use direct_fog_url(with_path: true) to get the the url of the image uploaded. I then get the following error:
ActiveRecord::RecordInvalid Validation failed: Image could not download file
I saw these two possible solutions:
https://github.com/jnicklas/carrierwave/issues/700
http://www.github.com/jnicklas/carrierwave/issues/888
But neither one seems to work.
Im using the older deleted command: overwriting method process_uri (enter link description here):
def process_uri(uri)
URI.parse(URI.escape(URI.unescape(uri)).gsub("[", "%5B").gsub("]", "%5D").gsub("+", "%2B"))
end
In my application I am using the following Gems:
gem 'fog'
gem 'carrierwave'
gem 'carrierwave_direct'
gem 'rmagick'
Thanks!
UPDATE: After implementing #Alex's answer below we resolved that problem but now when we do the upload we get the following error:
Excon::Errors::MovedPermanently
PermanentRedirect
The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.

Answer 1

For your Excon::Errors::MovedPermanently issue, make sure that you have the right data center region configured in your carrierwave.rb file. For example, if you're hosted on us-west, your region needs to be set to us-west.

Answer 2

Have you found a solution to this problem yet?
I'm facing the same problem here, I'm trying to fetch a remote URL with carrierwave (not on S3) and I get the notorious 'could not download file' error:
Validation failed: Image could not download file
[...]/gems/activerecord-3.2.9/lib/active_record/validations.rb:56:in `save!'
Could you post your URL to see what special characters there are?
EDIT: I found a solution. My case required that I did not change or escape the uri at all. I found that by adding 'return' to the 'def process_uri(uri)' method it works just fine.
Just in case this is useful to someone else, this is my overriding method in my uploader class:
def process_uri(uri)
return URI.parse(uri)
end