for name, val := range http.Headers.GetRequest().GetAdd() {
		errs = AppendValidation(errs, ValidateHTTPHeaderWithAuthorityOperationName(name))
		errs = AppendValidation(errs, ValidateHTTPHeaderValue(val))
	}
	for name, val := range http.Headers.GetRequest().GetSet() {
		errs = AppendValidation(errs, ValidateHTTPHeaderWithAuthorityOperationName(name))
		errs = AppendValidation(errs, ValidateHTTPHeaderValue(val))
	}

	if !validHeaderRegex.MatchString(name) {
		return fmt.Errorf("header name %s is not a valid header name", name)
	}
	return nil
}

// ValidateHTTPHeaderWithAuthorityOperationName validates a header name when used to add/set in request.
func ValidateHTTPHeaderWithAuthorityOperationName(name string) error {
	if name == "" {
		return fmt.Errorf("header name cannot be empty")
	}
	// Authority header is validated later