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Hey, I think I have found a small bug and fixed it!

When client requests with header setting as "Git-Protocol: version=2", the origin code failed. The client shows error with "expected flush after ref listing". By using wireshark, I realized the server failed to handle the second request correctly.
And finally I found that the cmd.Env is not set correctly when the "Git-Protocol" header is set since it's always going to be covered the second assignment. Simply changing the order of assignment works.
It's my first time to create a pull request and try to make some contribution to your project. It will be kind of you to let me know if I did anything wrong.