[gostyle.errorstrings] Error strings should not be capitalized (unless beginning with proper nouns or acronyms) or end with punctuation, since they are usually printed following other context. (ref: https://github.com/golang/go/wiki/CodeReviewComments#error-strings ): "Body: got %!q(MISSING), want %!q(MISSING)"

[gostyle.handlerrors] Do not discard errors using `_` variables. If a function returns an error, check it to make sure the function succeeded. Handle the error, return it, or, in truly exceptional situations, panic. (ref: https://github.com/golang/go/wiki/CodeReviewComments#handle-errors )

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