Sending file with Goliath/Grape

[Michael Martin Moro]

Good day !

I'm working on a tool that allow people to download audio files.

Unfortunately I've been unable to find any information about rendering binary files through Grape. Is it possible ? Or is it rather something that should be done only by interacting with Goliath ? Or is using Goliath/Grape to serve files a really bad idea ?

Thanks for reading.

[Daniel Doubrovkine]

You should just be able to set the proper content-type and return binary data. We certainly do that for images (in this example as attachments).

header "Content-Disposition", "attachment; filename*=UTF-8''#{URI.escape(filename)}"
header "Content-Type", "image/jpeg"
data

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[Michael Martin Moro]

Thanks for the tip !

It does work for text files and such, the mimetype is sent properly. However for some reason it tries to read the data that I send back, and fails whenever a non-ascii character is met, which limits the possible contents for a text file, and prevents from sending any binary files. I end up with an error that looks like this:

{"error":"\"\\x89\" on US-ASCII"}

Is there something missing to get binary support ?

[Daniel Doubrovkine]

Two things:

1) Make sure you have the correct content-type, that's not becoming JSON or something like that. For example content_type :pdf, "application/pdf".

2) Make sure the encoding of your data is binary. Check what data.encoding is. If you're serving a file, make sure to open it in "rb" binary mode.

If everything fails, post your code. 

[Michael Martin Moro]

Indeed there was a format json somewhere that shouldn't have been here.

It works fine now, thanks for the help !