type Err struct {
    Message    string            `json:"message"`
    StatusHTTP int               `json:"-"`
    ID         string            `json:"id"`
    Details    []string          `json:"details,omitempty"`
    Fields     map[string]string `json:"fields,omitempty"
}

Err -- standart serializable API error Message -- constant error
message:

+ "invalid username"
+ "quota exceeded"
+ "validation error"
...etc...

ID -- unique error identification code Details -- optional context error
messages kinda

+ "field 'Replicas' must be non-zero value"
+ "not enough tights to feed gopher"
+ "resource 'God' does't exist"

func BuildErr(prefix string) func(string, int, string) *Err

BuildErr -- produces Err constructor with custom ID prefix Example:

	MyErr := BuildErr("42")
	ErrNotEnoughCheese = MyErr("not enough cheese", 404, "666")

 	--> "[42666] HTTP 400 not enough cheese "

func NewErr(msg string, status int, ID string) *Err

NewErr -- constructs Err struct with provided message and ID

func (err *Err) AddDetailF(formatS string, args ...interface{}) *Err

AddDetailF --adds formatted message to Err, chainable

func (err *Err) AddDetails(details ...string) *Err

AddDetails -- adds detail messages to Err, chainable

func (err *Err) AddDetailsErr(details ...error) *Err

AddDetailsErr -- adds errors as detail messages to Err,chainable

func (err *Err) WithField(name, value string) *Err

WithField -- adds field to Err, chainable

func (err *Err) WithFields(fields Fields) *Err

WithFields -- adds fields to Err, chainable

func (err *Err) Error() string

Returns text representation kinda "unable to parse quota []"

func (err *Err) Gonic(ctx *gin.Context)

Gonic -- aborts gin HTTP request with StatusHTTP and provides json representation of error