Gin serve []byte as file
Solution 1:
Use Context.Data to write a []byte as the response.
You can also use Context.DataFromReader to copy directly from the FTP response to the HTTP response.
HTTP responses are a stream of bytes. There's no way to get around that.
Solution 2:
You can write to the ResponseWriter as you are reading the file. It works just like using http.ResponseWriter.
import "io"
//...
io.Copy(ctx.ResponseWriter, ftpReader)