Tvheadend

Hello,

I try to play a http stream with TVH 4.05 on a Rasperry Pi 2 running latest OSMC and Kodi TVH client (14.2).

It works perfect for:
pipe:///usr/bin/avconv -i http://video1.anixehd.tv:8080/Apple/wifistream.m3u8 -acodec copy -vcodec copy -f mpegts pipe:1

But when I try to send a http header because I have to spoof my IP Adress all I got is an Error: "HTTP error 403 Forbidden."

pipe:///usr/bin/avconv -headers $'X-Forwarded-For: 195.186.136.21\r\n' -i http://pebbles106-lh.akamaihd.net/i/rtl_1@97459/index_900_av-p.m3u8 -acodec copy -vcodec copy -f mpegts pipe:1

This works perfect in Kodi's Simple IPTV Client with a m3u playlist containing follwoing code:
http://pebbles107-lh.akamaihd.net/i/sat1_1@97461/index_900_av-p.m3u8|X-Forwarded-For=195.186.136.21
#EXTINF:-1 tvg-id="RTL.de" tvg-logo="rtl.png",RTL

Maybe the syntax is wrong?
Anybody know how I get this working ?