Error return value of `file.Seek` is not checked (errcheck)

Error return value of `ctx.Writer.Write` is not checked (errcheck)

SA1019: "io/ioutil" has been deprecated since Go 1.19: As of Go 1.16, the same functionality is now provided by package [io] or package [os], and those implementations should be preferred in new code. See the specific function documentation for details. (staticcheck)

Process completed with exit code 1.