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> Since version 1.22, streaming is the default method used by web2py to serve files from the following directories:

[web2py working folder]/application/[your app]/static/

[web2py working folder]/application/[your app]/uploads/ 
    
> For customised file serving function that overrides the default download behavior, web2py will automatically detect whether the returning object is a streaming object (an iterator), or a string object, and serve accordingly.

Examples:

# streams big file using default byte size for chunks 
        def my_big_file_downloader():        
            ...
            ...
            import os
            filename=request.args[0]
            pathfilename=os.path.join(request.folder,'uploads/', filename)
            return response.stream(open(pathfilename,'rb'), chunk_size=10**6)

# the old way
        def my_small_file_downloader():
            ...
            import os
            import gluon.contenttype
            filename=request.args[0]
            response.headers['Content-Type']=gluon.contenttype.contenttype(filename)
            pathfilename=os.path.join(request.folder,'uploads/', filename)
            return open('pathfilename', 'rb').read()

You call them with:

http://[host]/[app]/[controller]/my_big_file_downloader/[filename in uploads]

http://[host]/[app]/[controller]/my_big_file_downloader/[filename in uploads]/[...]

where [...] is the filename you want the downloading user to see.

See also:
    Infinite data stream <http://mdp.cti.depaul.edu/AlterEgo/default/show/32>

AlterEgo

old web2py blog

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