using python pyramid framework and post method.By providing file type and file name we we download file.

pyramid_view_file_download.py

__author__ = 'giasuddin'

from pyramid.view import view_config
import os

@view_config(request_method='POST', renderer='json')
def post(self):
    file_type = self.request.matchdict['file_type']
    node_type = self.request.matchdict['node_type']
    sanitize_file = False
    if self.request.POST['files'].filename:
        filename = self.request.POST['files'].filename
        sanitize_file = filename
        input_file = self.request.POST['files'].file
        media_root = "/home/path/" + '/' + file_type + '/' + node_type
        if not os.path.exists(media_root):
            os.makedirs(media_root)
        file_path = os.path.join(media_root, sanitize_file)
        output_file = open(file_path, 'wb')
        data = input_file.read()
        output_file.write(data)
        output_file.close()
    return {'filename': sanitize_file}