Goで簡単なエコーサーバーを作る ref: http://qiita.com/esehara@github/items/34f8675c61169da06d73

file0.go

package main

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

func getRSS(s string) string {
    u, _ := url.Parse(s)
    q := u.Query()
    for k, _ := range u.Query() { q.Del(k) }
    q.Set("hoge", "fuga")
    u.RawQuery = q.Encode()
    return u.String()
}

func handler(w http.ResponseWriter, r *http.Request) {
    r.ParseForm()
    url := getRSS(r.Form["u"][0])

    resp, _ := http.Get(url)
    defer resp.Body.Close()

    byteArray, _ := ioutil.ReadAll(resp.Body)
    fmt.Fprint(w, string(byteArray))
}

func main() {
    fmt.Println("Start Server ...")
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}