Closed streams should not panic

gin-demo.go

package main

import (
	"gopkg.in/gin-gonic/gin.v1"
	"net/http"
	"crypto/tls"
	"fmt"
	"time"
)

func main() {
	r := gin.New()
	r.Use(gin.Logger())
        r.GET("/", func(c *gin.Context) {
		fiveHundredKilobytes := []string{}
		oneKilobyte := `cgdtWb02T5YosxdNAueaCvoeLqhGCYrPuAxsqT9G3CW7MGfSdN16RY0rgCxe6nwT
		tqd6FQlKtUj0i3h79hpJ5mbfxdHFlhgXn4kXwKhCj4/9JCeOdUeinJCHUISh4L0U
		N2d+0ycigJFu7VVkS3WGq8u1Z0ErHg6CV4YVB+Woeb3B4QUnPnkqm41+KVCONKfR
		5h7FJ6c3dh0XO/pcqoQXwJcqmUQ1zUUM2ElRgXlY5c5H0X3USvGhwtTSfUb9uxIi
		4cuJxHj99mArDwMyUpQw636VdSlOlwzFUntKoQUG7Nft6ujT8lFy4qV4CtUycmh8
		UrH5Cgkvu1RiQLSLnv/KyfMW2wWYc/P60lJyfFxPCSiGUAXIs38zqnpn6O37FJC4
		N7E5XztyRISE9WRX+OG4J/Yc4DNHePoXTNBGQqS9YBRPSJDqQI8eU91M3XMQgXjv
		1KkRE0Zutgs0MH3T9nXnT5Nr3szKN7voo3V78/4kU0yA0G0zvlUK2w7C68BYykT7
		rJkpeSRNA6dTThO8vUb6vfFz7s9DD4RQu48KX3sj2Q3WmjkH4D6D1llHYwYMlg/h
		RE0nFqPw1Qe+G6qS9C2mmJzs1UapzRbdEikvJthNxyYphaRsit+nLqDF4xpYnGih
		KaKu16yI5wcCdxEpcpmT5urHk9AfrTm4OpsQdRmv8Qh0UL0WTrb3sBcSc6u3GRbc
		/YIIvUM5iXTdjRbAkmHQo5VNoO9GedxBY3UrYPK9KMYxEbvy72EDePzlGmkESWbu
		sjiRqMQBNCQfrQJKC/JDJ4MtbRlMQT4MkraTEt4JklfupcL1TiVZdyfmqlwkWXXT
		dODBZ1FgnF1p9AHJI6/ByEvzrb0rVAX+p7abEg+wJtUaS5/OtoHyDXG0OceXvhQW
		njYTiAXbcdQ7MnB3DMPW1kdsnaD7qqvY10aQf31XqpOQpN8Ccj+6QPU7SS9XRyVq
		aas412hPXbBhnOYMS3y0z96E3styfN6CD6b7DOYIEMG2zjRwG7ujbBdvCvPSFWIx
		VtYiGiO0IioTS6tLQ7LubxeDnmtvx+7dqgGoafp1YHPyursRG+DQ3T6qRTjggyHL
		Ga4WTy529CY5utcAqKtvHCX/FSlQcYlwMGHf5R4gi76md+mhne1TNnb+hHgZJZvv
		188ILbJJ04aywwERpRkpoLU+fukZ6D4BtuQMcf6Or9g25W0ht4sdD7ePMKSkJNA6
		Qn72QMW52r0P5d59kWOpoNkhmHeqhHFE3O4m4BRQuZ5S9kf3iXyRu1yxjPak6lI1
		Lg3EM8g5/rqeYDU/yGV5hxOyEDlJJr1HQgMcWz/72dTCOGgJRB5+F4/hXwAA/M/Q
		YG4+B1/I16onIEugQrUUkQ==`
		for i := 0; i < 500; i++ {
			time.Sleep(10 * time.Millisecond)
			fiveHundredKilobytes = append(
				fiveHundredKilobytes,
				oneKilobyte,
			)
		}
		c.JSON(
			200,
			struct{
				Res []string `json:"response"`
			}{
				Res: fiveHundredKilobytes,
			},
		)
	})
        server := http.Server{
		Addr: ":8080",
		Handler: r,
		TLSConfig: &tls.Config{
			PreferServerCipherSuites: true,
		},
	}
	regularServer := http.Server{
		Addr: ":8181",
		Handler: r,
	}
	forever := make(chan interface{}, 0)
	go func() {
		err := server.ListenAndServeTLS("server.crt", "server.key")
		if err != nil {
			fmt.Println(err)
		}
	}()
	go func() {
		err := regularServer.ListenAndServe()
		if err != nil {
			fmt.Println(err)
		}
	}()
	<-forever
}