Add accept range header to play mp4 file on IOS devices in Django

import os
import re
import mimetypes
from wsgiref.util import FileWrapper

from django.http.response import StreamingHttpResponse

range_re = re.compile(r'bytess*=s*(d+)s*-s*(d*)', re.I)

class RangeFileWrapper(object):
    def __init__(self, filelike, blksize=8192, offset=0, length=None):
        self.filelike = filelike, os.SEEK_SET)
        self.remaining = length
        self.blksize = blksize

    def close(self):
        if hasattr(self.filelike, 'close'):

    def __iter__(self):
        return self

    def __next__(self):
        if self.remaining is None:
            # If remaining is None, we're reading the entire file.
            data =
            if data:
                return data
            raise StopIteration()
            if self.remaining <= 0:
                raise StopIteration()
            data =, self.blksize))
            if not data:
                raise StopIteration()
            self.remaining -= len(data)
            return data

def stream_video(request, filename):
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    file_path = os.path.join(BASE_DIR, "app_name/static/video/" + filename)

    range_header = request.META.get('HTTP_RANGE', '').strip()
    range_match = range_re.match(range_header)
    size = os.path.getsize(file_path)
    content_type, encoding = mimetypes.guess_type(file_path)
    content_type = content_type or 'application/octet-stream'
    if range_match:
        first_byte, last_byte = range_match.groups()
        first_byte = int(first_byte) if first_byte else 0
        last_byte = int(last_byte) if last_byte else size - 1
        if last_byte >= size:
            last_byte = size - 1
        length = last_byte - first_byte + 1
        resp = StreamingHttpResponse(RangeFileWrapper(open(file_path, 'rb'), offset=first_byte, length=length), status=206, content_type=content_type)
        resp['Content-Length'] = str(length)
        resp['Content-Range'] = 'bytes %s-%s/%s' % (first_byte, last_byte, size)
        resp = StreamingHttpResponse(FileWrapper(open(file_path, 'rb')), content_type=content_type)
        resp['Content-Length'] = str(size)
    resp['Accept-Ranges'] = 'bytes'
    return resp

Sometimes you must notice that your video direct link is playing on all devices but not on IOS devices or Apple safari browser. The reason is that it needs 'Accept-Ranges' header to be present in the request. You can add that by using the above code. The required steps to implement it as follow:

  1. 1. Put the above code in a view and add it to to your app like below:
    urlpatterns = [
       path('stream-video/', view.stream_video, name='stream_video'),
  2. 2. Now your video URL will be like below

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