fillValues case reflect.Int, reflect.Int64 provides error if header is not set

[TorbenCK]

fillValues function returns error if header with int value is not set.

type ControllerPostParams struct {
IntegerInJsonBody int json:"integerInJsonBody" validate:"min=1,max=100000"
stringInHeader string header:"X-String,omitempty"
}

The error occurs in switch case
case reflect.Int, reflect.Int64:
var v int64
if v, err = strconv.ParseInt(value, 10, 64); err != nil {
return err
}
sv.SetInt(v)
return nil

in case of an empty header value = "" strconv.ParseInt throws an error. I guess the same problem will occur in all number based switch cases from fillValues. I recommended to check if the header is set and otherwise exit the loop.

I know you can also set header:"-" in the struct tags, but this can be easily forgotten.
Additionally we initialise our params with defaults and httpheader.Decode overwrites everything if we do not set header:"-", which adds a lot of overhead in our stuct tags.

My proposal:
add an option that struct fields are left unharmed and are not overwritten with empty strings if no header is present.

[mozillazg]

@TorbenCK Thanks for reporting. I'll check it later.

[mozillazg]

Looks like that is a bug. I'll fix it soon.

I recommended to check if the header is set and otherwise exit the loop.

Yes, you're right. I'll fix it like this.

[mozillazg]

@TorbenCK I created a PR (#5) to fix this issue. Does it fix your problem?