Byte range request should return 206 Partial Content

[markotitel]

Hope you see this soon = )

One more issue form me :)
NOTE: I am not GO developer = (
We are successfully using caddy s3 proxy. But I've noticed that when requesting Range response code is "copied" from S3 which is 200 OK.

But if Range is requested response should be 206 Partial Content. I have tried to figure where should I add this to test but unfortunately this is to abstract for me to do in the source.

Hope you see this soon = )