I'm in the process of 'upgrading' an old Web2py application hosted on GAE 
that performs a fair amount of file manipulation.  The original version 
used the blobstore to create files, and the 'default/download' function was 
modified to serve those blobs like this (abbreviated):

        blob_key = request.args[0]
        blob_info = blobstore.get(blob_key)

        response.headers['X-AppEngine-BlobKey'] = blob_key;
        response.headers['Content-Type'] = blob_info.content_type;
        response.headers['Content-Disposition'] = "attachment; filename=%s" 
% blob_info.filename

        blob_reader = blob_info.open()
        response.stream(blob_reader)

Blobstore is now gone so I changed the code to use a GCS bucket.  
Everything works well everywhere in the application as far as uploading and 
creating files internally, but when I want to offer those files for 
download I can't get it to work.  As you know, files on GCS buckets are 
accessible via their path (i.e. cloudstore.open(file_path)) however if I 
try something like:

file_reader = cloudstore.open(file_path)
response.stream(file_reader)

all I get is a blank webpage with 'None' written on it, and no file.
I can't (and don't want to) offer the actual file_path for download 
straight to the user because the bucket permissions are private and web2py 
is the only one authorized to access it.

I've tried a number of combinations (setting headers with content-type and 
content-disposition versus no headers, response.write versus 
response.stream, reading file to StringIO object and try to stream/write 
that object instead) but none of them work.  I'm at a point where I'm 
blindly trying different code combinations.  Does anybody have a working 
code example for this?

Thanks,
Julian

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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