func (r *Request) SetFormData(data map[string]string) *Request {
	for k, v := range data {
		r.FormData.Set(k, v)
	}
	return r
}
SetFormData method sets Form parameters and their values in the current request.
It's applicable only HTTP method `POST` and `PUT` and requests content type would be set as
`application/x-www-form-urlencoded`.
resty.R().
SetFormData(map[string]string{
"access_token": "BC594900-518B-4F7E-AC75-BD37F019E08F",
"user_id": "3455454545",
})
Also you can override form data value, which was set at client instance level
package resty
import (
	"encoding/base64"
	"encoding/json"
	"encoding/xml"
	"fmt"
	"io"
	"net"
	"net/url"
	"reflect"
	"strings"
)
type SRVRecord struct {
	Service string
	Domain  string
}
func (r *Request) SetHeader(header, value string) *Request {
	r.Header.Set(header, value)
	return r
}
func (r *Request) SetHeaders(headers map[string]string) *Request {
	for h, v := range headers {
		r.SetHeader(h, v)
	}
	return r
}
func (r *Request) SetQueryParam(param, value string) *Request {
	r.QueryParam.Set(param, value)
	return r
}
func (r *Request) SetQueryParams(params map[string]string) *Request {
	for p, v := range params {
		r.SetQueryParam(p, v)
	}
	return r
}
func (r *Request) SetMultiValueQueryParams(params url.Values) *Request {
	for p, v := range params {
		for _, pv := range v {
			r.QueryParam.Add(p, pv)
		}
	}
	return r
}
func (r *Request) SetQueryString(query string) *Request {
	params, err := url.ParseQuery(strings.TrimSpace(query))
	if err == nil {
		for p, v := range params {
			for _, pv := range v {
				r.QueryParam.Add(p, pv)
			}
		}
	} else {
		r.client.Log.Printf("ERROR %v", err)
	}
	return r
}