Content-Type when uploading to S3

[Alex B]

Images uploaded to S3 have their `Content-Type` set to `binary/octet-stream` as opposed to an image type such as `image/jpeg` or `image/png` or `image/gif`.

Could you kindly advise me as to how to automatically set the content-type?

If left set to `binary/octet-stream`, images are "downloaded" rather than displayed (or when a display is forced, a Javascript console message appears: "*Resource interpreted as Image but transferred with MIME type binary/octet-stream*").

I was able to replicate this using jQuery-File-Upload-9.6.0/basic-plus.html adjusted just enough to upload to S3.

[Alex B]

I am using Carrierwave to post-process my images, and by adding the following two lines to the uploader the Content-Type is set properly (on the post-processed images).

        include CarrierWave::MimeTypes

        process :set_content_type

[Alex B]

That said, it would still be nice to know if it is possible to set the content-type of the uploaded images, via jQuery File Upload Plugin.

[Mark J. Lehman]

Did you ever find a solution to this? I too have done this with carrierwave but cannot figure out how to get the actual file type to transfer as the content type with just the jQuery File Upload plugin.

I managed to change it so that all files uploaded now are set to Content-Type: image/jpeg on S3. That may help you, but it doesn't help me, as I now have PDFs and MP3 files that, when uploaded, show up in S3 as Content-Type: image/jpeg.

Anyway, I basically followed the tutorial on heroku for the initial setup, but changed the instance variable in my controller to this:

    @s3_direct_post = S3_BUCKET.presigned_post(

                      key: "uploads/#{SecureRandom.uuid}/${filename}",

                      success_action_status: 201,

                      acl: :public_read,

                      content_type: "").where(:content_type).starts_with("")

(Bold part is what I added.) Don't ask me why, but this change makes every file I upload default to image/jpeg file type.

Please let me know if you found a solution that uploads the ACTUAL content type.

[Alex B]

Sorry, no.

I am lucky to have Carrierwave do it for me during post-processing (thanks to the two lines I mentioned on July 22nd).

If you ever find a way, please post it here - I am sure many people would benefit.

[Mark J. Lehman]

Will do. I posted to stackoverflow as well, so hopefully somebody jumps in to help:

http://stackoverflow.com/questions/25315658/setting-the-content-type-in-direct-to-s3-upload-using-rails-and-jquery-file-uplo

Mark J. Lehman

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