Fix default User-Agent when using custom headers #592
Merged
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When using non-nil
hdrparameter withc.Requestmethod, and not setting User-Agent header explicitly, it would be left unset (when it should've been set toc.UserAgent). This means that Go HTTP client would use the default "Go-http-client/2.0" string.Suppressing the header altogether is still possible by setting it to empty string.