Imho it makes more sense from REST perspective. Also, in the future there
will be ROUTE for uploading image to image build. As it's not a good idea
transport file inside JSON, all the parameters (compose id and image
build id) need to be inside the URL. Therefore for the sake of consistency,
all these routes should have compose id and image build id in the URL.
There is another solution to embedding multiple values inside http body
which allows file transport - multipart/form-data. I think using form-data
is worth when doing more complex stuff, for our usecase transporting all
the metadata in the URL is more appropriate solution.
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