[FFmpeg-user] Browser preflight interrupted URL output

[fish]

I use 'ffmpeg-i somefile.ogg - c copy list 1-f ogg' http://127.0.0.1:80 `To output the video to http://127.0.0.1.
When I use fetch from other website, the browser send an OPTIONS preflight request. 
This interrupts the normal output of ffmpeg, even with the addition of 'headers=Access Control Allow Methods: *'. 
Is there any way to ignore pre check requests.