test.go

package main

import (
	"fmt"
	"io/ioutil"
	"net"
	"net/http"
	"net/url"
	"strings"
	"time"
)

func main() {

	Url := "http://eu.httpbin.org/anything"

	proxyUrl, _ := url.Parse("http://127.0.0.1:8888")

	var netTransport = &http.Transport{
		Dial: (&net.Dialer{
			Timeout: 5 * time.Second,
		}).Dial,
		TLSHandshakeTimeout: 5 * time.Second,
		Proxy:               http.ProxyURL(proxyUrl),
	}

	c := &http.Client{
		Timeout:   10 * time.Second,
		Transport: netTransport,
	}

	headers := map[string]string{
		"Accept":                    "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
		"Accept-Encoding":           "gzip, deflate, br",
		"Accept-Language":           "en-US,en;q=0.9",
		"User-Agent":                "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36",
		"Upgrade-Insecure-Requests": "1",
		"Connection":                "keep-alive",
	}

	// postDATA := map[string]string{
	// 	"This data": " is posted",
	// 	"like":      "this",
	// }

	// payload, _ := json.Marshal(postDATA)

	// posting form data

	form := url.Values{}
	form.Add("Posting", "this")

	req, _ := http.NewRequest("GET", Url, strings.NewReader(form.Encode()))

	setHeaders(req, headers)

	resp, _ := c.Do(req)

	defer resp.Body.Close()

	bytes, _ := ioutil.ReadAll(resp.Body)

	fmt.Println(string(bytes))

}

func setHeaders(req *http.Request, m map[string]string) {
	for key, value := range m {
		req.Header.Add(key, value)
	}
}