在未设置解码器时，优化效率

[guonaihong]

测试代码如下

package main

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/guonaihong/gout"
	"net/http"
	"sync"
	"time"
)

func server() {
	router := gin.New()
	router.POST("/colorjson", func(c *gin.Context) {
		c.String(200, string(make([]byte, 2*1024)))
	})

	router.Run()
}

const nthread = 450
const total = 10000

func useMap() {
	c := &http.Client{
		Transport: &http.Transport{
			MaxIdleConnsPerHost: 500,
		},
	}

	var wg sync.WaitGroup
	wg.Add(nthread)
	now := time.Now()
	defer func() {
		wg.Wait()
		fmt.Printf("total:%v\n", time.Now().Sub(now))
	}()

	done := make(chan struct{})
	go func() {
		for i := 0; i < total; i++ {
			done <- struct{}{}
		}

		close(done)
	}()

	for i := 0; i < nthread; i++ {
		go func() {
			defer wg.Done()

			for range done {
				err := gout.New(c).POST(":8080/colorjson").
					//Debug(true).
					SetJSON(gout.H{"str": "foo",
						"num":   100,
						"bool":  false,
						"null":  nil,
						"array": gout.A{"foo", "bar", "baz"},
						"obj":   gout.H{"a": 1, "b": 2},
					}).
					Do()

				if err != nil {
					fmt.Printf("err = %v\n", err)
				}
			}
		}()
	}
}

func main() {
	go server()

	time.Sleep(time.Millisecond * 200)

	useMap()
}