Let's Control It

Hi Guys,
have a question about WS2812 control over http

How do I set colors is known to me.
http://xxx.xxx.x.xxx/control?cmd=neopixel,1,0,255,0 for green

Now I want this LED flashing green.
Is it possible to send that over http?

I would appreciate help.

Sorry for my English, come from Germany and google has helped.

Jonny