mopidy configuration file for Header Upgrade is not defined error.

mopidy.conf1

$ mopidy --show-conf
--for privacy reasons the domain.tld has been replaced with user.tld--

[logging]
console_format = %(levelname)-8s %(message)s
debug_format = %(levelname)-8s %(asctime)s [%(process)d:%(threadName)s] %(name)s\n  %(message)s
debug_file = mopidy.log
config_file =

[loglevels]
cherrypy = warning
pykka = info

[audio]
mixer = autoaudiomixer
mixer_track = 
output = autoaudiosink
visualizer = 

[proxy]
scheme = 
hostname = 
port = 
username = 
password = 

[http]
enabled = true
hostname = mop.user.tld
port = 6680
static_dir = /home/user/domains/mop.user.tld/public_html/webclient

[mpd]
enabled = true
hostname = 127.0.0.1
port = 6600
password = ********
max_connections = 20
connection_timeout = 60

[local]
enabled = true
media_dir = /media
playlists_dir = $XDG_DATA_DIR/mopidy/local/playlists
tag_cache_file = $XDG_DATA_DIR/mopidy/local/tag_cache
scan_timeout = 1000
excluded_file_extensions = 
  .jpeg
  .jpg
  .png
  .txt
  .log

[stream]
enabled = true
protocols = 
  file
  http
  https
  mms
  rtmp
  rtmps
  rtsp