Python's SimpleHTTP server doesn't add Accept-Ranges and also doesn't support range requests: https://github.com/python/cpython/issues/86809 According to the spec, this means the server may or may not support Range requests, but we know that SimpleHTTP server doesn't, so let's disable it. If they fix it, they will hopefully add an Accept-Ranges header. See also: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8505#note_2994060 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9341>