def simple_file_download(request):
  # do something...
  content = open("simplefile", "rb").read()

def read_file(filename, buf_size=8192):
  with open(filename, "rb") as f:
    while True:
      content = f.read(buf_size)
      if content:
        yield content
      else:
        break
def big_file_download(request):
  filename = "filename"
  response = HttpResponse(read_file(filename))
  return response

import csv
 
from django.utils.six.moves import range
from django.http import StreamingHttpResponse
 
class Echo(object):
  """An object that implements just the write method of the file-like
  interface.
  """
  def write(self, value):
    """Write the value by returning it, instead of storing in a buffer."""
    return value
 
def some_streaming_csv_view(request):
  """A view that streams a large CSV file."""
  # Generate a sequence of rows. The range is based on the maximum number of
  # rows that can be handled by a single sheet in most spreadsheet
  # applications.
  rows = (["Row {0}".format(idx), str(idx)] for idx in range(65536))
  pseudo_buffer = Echo()
  writer = csv.writer(pseudo_buffer)
  response = StreamingHttpResponse((writer.writerow(row) for row in rows),
                   content_type="text/csv")
  response['Content-Disposition'] = 'attachment; filename="somefilename.csv"'
  return response

class FileWrapper:
  """Wrapper to convert file-like objects to iterables""" 
  def __init__(self, filelike, blksize=8192):
    self.filelike = filelike
    self.blksize = blksize
    if hasattr(filelike,'close'):
      self.close = filelike.close 
  def __getitem__(self,key):
    data = self.filelike.read(self.blksize)
    if data:
      return data
    raise IndexError 
  def __iter__(self):
    return self 
  def next(self):
    data = self.filelike.read(self.blksize)
    if data:
      return data
    raise StopIteration

from django.core.servers.basehttp import FileWrapper
from django.http import HttpResponse
import os
def file_download(request,filename):
 
  wrapper = FileWrapper(open(filename, 'rb'))
  response = HttpResponse(wrapper, content_type='application/octet-stream')
  response['Content-Length'] = os.path.getsize(path)
  response['Content-Disposition'] = 'attachment; filename=%s' % filename
  return response

import os, tempfile, zipfile 
from django.http import HttpResponse 
from django.core.servers.basehttp import FileWrapper 
def send_zipfile(request): 
  """                                     
  Create a ZIP file on disk and transmit it in chunks of 8KB,         
  without loading the whole file into memory. A similar approach can     
  be used for large dynamic PDF files.                    
  """ 
  temp = tempfile.TemporaryFile() 
  archive = zipfile.ZipFile(temp, 'w', zipfile.ZIP_DEFLATED) 
  for index in range(10): 
    filename = __file__ # Select your files here.              
    archive.write(filename, 'file%d.txt' % index) 
  archive.close() 
  wrapper = FileWrapper(temp) 
  response = HttpResponse(wrapper, content_type='application/zip') 
  response['Content-Disposition'] = 'attachment; filename=test.zip' 
  response['Content-Length'] = temp.tell() 
  temp.seek(0) 
  return response

# Will serve /var/www/files/myfile.tar.gz
# When passed URI /protected_files/myfile.tar.gz
location /protected_files {
  internal;
  alias /var/www/files;
}

# Will serve /var/www/protected_files/myfile.tar.gz
# When passed URI /protected_files/myfile.tar.gz
location /protected_files {
  internal;
  root /var/www;
}

response['X-Accel-Redirect']='/protected_files/%s'%filename

@login_required
def document_view(request, document_id):
  book = Book.objects.get(id=document_id)
  response = HttpResponse()
  name=book.myBook.name.split('/')[-1]
  response['Content_Type']='application/octet-stream'
  response["Content-Disposition"] = "attachment; filename={0}".format(
      name.encode('utf-8'))
  response['Content-Length'] = os.path.getsize(book.myBook.path)
  response['X-Accel-Redirect'] = "/protected/{0}".format(book.myBook.name)
  return response