golang Content-Type: multipart/form-data; boundary

main.go

package main

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

func main() {

	http.HandleFunc("/", root)
	http.HandleFunc("/collect_bookings", multipart)

	http.ListenAndServe(":8090", nil)
}

func root(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, "Landed")
}

func multipart(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		io.WriteString(w, "Only POST is supported!")
		return
	}

	b, err := ioutil.ReadAll(r.Body)
	if err != nil {
		fmt.Println(err)
	}

	// Calling ParseMultipartForm, with maxMemory = 0. Tried also with 32, 10000 etc. but without success.
	r.ParseMultipartForm(0)
	v := r.FormValue("HotelCode")
	// v is empty
	fmt.Println("HotelCode", v)

	s := string(b)
	fmt.Println(s)
	xml := ""
	if strings.Contains(s, "1111") {
		xml = `<?xml version="1.0"?><Status Code="1111" />`
	} else {
		xml = `<?xml version="1.0"?><Status Code="2222" />`
	}

	w.Header().Set("Content-Type", "text/xml; charset=utf-8")
	io.WriteString(w, xml)
}

Ty dude, you solved my problem :)