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	diff --git a/response.go b/response.go
	index feda869..b33b9c8 100644
	--- a/response.go
	+++ b/response.go
	@@ -1,53 +1,53 @@
	package impart

	import (
	"encoding/json"
	"net/http"
	"strconv"
	)

	type (
	- // envelope contains metadata and optional data for a response object.
	- envelope struct {
	+ // Envelope contains metadata and optional data for a response object.
	+ Envelope struct {
	Code int `json:"code"`
	ErrorType string `json:"error_type,omitempty"`
	ErrorMessage string `json:"error_msg,omitempty"`
	Data interface{} `json:"data,omitempty"`
	}
	)

	func writeBody(w http.ResponseWriter, body []byte, status int, contentType string) error {
	w.Header().Set("Content-Type", contentType+"; charset=UTF-8")
	w.Header().Set("Content-Length", strconv.Itoa(len(body)))
	w.WriteHeader(status)
	_, err := w.Write(body)
	return err
	}

	func renderJSON(w http.ResponseWriter, value interface{}, status int) error {
	body, err := json.Marshal(value)
	if err != nil {
	return err
	}
	return writeBody(w, body, status, "application/json")
	}

	func renderString(w http.ResponseWriter, status int, msg string) error {
	return writeBody(w, []byte(msg), status, "text/plain")
	}

	func WriteSuccess(w http.ResponseWriter, data interface{}, status int) error {
	- env := &envelope{
	+ env := &Envelope{
	Code: status,
	Data: data,
	}
	return renderJSON(w, env, status)
	}

	func WriteError(w http.ResponseWriter, e HTTPError) error {
	- env := &envelope{
	+ env := &Envelope{
	Code: e.Status,
	ErrorMessage: e.Message,
	}
	return renderJSON(w, env, e.Status)
	}