Git archive remote end

I was trying to check out one file from Github. After doing this thread, I tried

git archive --format=tar --remote=ssh://git@github.com:user/project.git HEAD:README.md

      

        
        
        
      

    

I am getting the following error

fatal: The remote end hung up unexpectedly

      

        
        
        
      

    

Edit: I tried to get the file from raw, getting the head from git ls-remote url

. Then using this head I got the file using wget. But I would like to know how to do this using git commands.