diff --git a/go.mod b/go.mod
index 2d418b5..f46ff12 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,13 @@
 module gogs.lehouerou.net/Laurent/dnsupdater
 
-go 1.12
+go 1.13
 
 require (
+	github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927 // indirect
+	github.com/dghubble/sling v1.3.0
 	github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2
 	github.com/sirupsen/logrus v1.4.2
 	github.com/urfave/cli v1.20.0
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 )
diff --git a/go.sum b/go.sum
index b99b2a2..9db8d3c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,11 @@
+github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927 h1:SKI1/fuSdodxmNNyVBR8d7X/HuLnRpvvFO0AgyQk764=
+github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927/go.mod h1:h/aW8ynjgkuj+NQRlZcDbAbM1ORAbXjXX77sX7T289U=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dghubble/sling v1.3.0 h1:pZHjCJq4zJvc6qVQ5wN1jo5oNZlNE0+8T/h0XeXBUKU=
+github.com/dghubble/sling v1.3.0/go.mod h1:XXShWaBWKzNLhu2OxikSNFrlsvowtz4kyRuXUG7oQKY=
+github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
+github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/matryer/try v0.0.0-20161228173917-9ac251b645a2 h1:JAEbJn3j/FrhdWA9jW8B5ajsLIjeuEHLi8xE4fk997o=
diff --git a/main.go b/main.go
index 147a6ba..0023dc0 100644
--- a/main.go
+++ b/main.go
@@ -1,19 +1,20 @@
 package main
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
-	"github.com/matryer/try"
-	log "github.com/sirupsen/logrus"
-	"github.com/urfave/cli"
-	"gopkg.in/gomail.v2"
 	"io/ioutil"
 	"net/http"
 	"os"
 	"path"
 	"regexp"
 	"time"
+
+	"github.com/dghubble/sling"
+	"github.com/matryer/try"
+	log "github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+	"gopkg.in/gomail.v2"
 )
 
 type Configuration struct {
@@ -43,12 +44,14 @@ type DnsResponse struct {
 }
 
 var (
-	configuration *Configuration
+	configuration Configuration
 	configPath    string
+	base          *sling.Sling
 )
 
 const (
-	GandiARecordUrl = "https://dns.api.gandi.net/api/v5/domains/%s/records/@/A"
+	GandiApiUrl     = "https://dns.api.gandi.net/api/v5/"
+	GandiARecordUrl = "domains/%s/records/@/A"
 )
 
 func main() {
@@ -83,15 +86,21 @@ func before(c *cli.Context) error {
 	}
 	defer file.Close()
 	decoder := json.NewDecoder(file)
-	configuration = &Configuration{}
-	err = decoder.Decode(configuration)
+	configuration = Configuration{}
+	err = decoder.Decode(&configuration)
 	if err != nil {
 		return err
 	}
+
+	base = sling.New().Client(&http.Client{
+		Timeout: 30 * time.Second,
+	}).Base(GandiApiUrl).
+		Set("X-Api-Key", configuration.GandiKey)
+
 	return nil
 }
 
-func start(c *cli.Context) error {
+func start(*cli.Context) error {
 	if err := update(); err != nil {
 		SendStatusMail(fmt.Sprintf("Error during update process : %s", err))
 		return err
@@ -102,25 +111,25 @@ func start(c *cli.Context) error {
 func update() error {
 	newIp, err := GetOutboundIP()
 	if err != nil {
-		return err
+		return fmt.Errorf("getting outbound ip: %v", err)
 	}
 
 	updatedDomains := ""
 	for _, domain := range configuration.Domains {
-		currentIp, err := GetCurrentIp(*configuration, domain)
+		currentIp, err := GetCurrentIp(domain)
 		if err != nil {
-			return err
+			return fmt.Errorf("getting current ip: %v", err)
 		}
 
 		if currentIp == newIp {
 			continue
 		}
 
-		log.Infoln(fmt.Sprintf("%s -> Ip has changed %s -> %s", domain, currentIp, newIp))
+		log.Infof(fmt.Sprintf("%s -> Ip has changed %s -> %s", domain, currentIp, newIp))
 
-		err = SetCurrentIp(newIp, domain, *configuration)
+		err = SetCurrentIp(newIp, domain)
 		if err != nil {
-			return err
+			return fmt.Errorf("setting current ip: %v", err)
 		}
 		updatedDomains += fmt.Sprintf("\t- %s\n", domain)
 	}
@@ -138,14 +147,14 @@ func SendStatusMail(messageText string) {
 
 	settings := configuration.MailSettings
 	if settings == nil {
-		log.Warnln("no smtp settings defined > status mail not sent")
+		log.Warnf("no smtp settings defined > status mail not sent")
 		return
 	}
 
 	d := gomail.NewDialer(settings.SmtpHost, settings.SmtpPort, settings.SmtpLogin, settings.SmtpPassword)
 	s, err := d.Dial()
 	if err != nil {
-		log.Errorln(fmt.Sprintf("error while dialing smtp server : %v", err))
+		log.Errorf(fmt.Sprintf("error while dialing smtp server : %v", err))
 		return
 	}
 
@@ -157,38 +166,31 @@ func SendStatusMail(messageText string) {
 		m.SetBody("text/plain", messageText)
 
 		if err := gomail.Send(s, m); err != nil {
-			log.Warnln(fmt.Sprintf("could not send email to %q: %v", r, err))
+			log.Warnf(fmt.Sprintf("could not send email to %q: %v", r, err))
 		}
 		m.Reset()
 	}
 }
 
-func GetCurrentIp(configuration Configuration, domain string) (string, error) {
+func GetCurrentIp(domain string) (string, error) {
 	var value string
 	err := try.Do(func(attempt int) (bool, error) {
 		var err error
-		value, err = func(configuration Configuration, domain string) (string, error) {
-			url := fmt.Sprintf(GandiARecordUrl, domain)
-			req, err := http.NewRequest("GET", url, nil)
-			if err != nil {
-				return "", err
-			}
-			req.Header.Set("X-Api-Key", configuration.GandiKey)
-			client := &http.Client{}
-			resp, err := client.Do(req)
-			if err != nil {
-				return "", err
-			}
-			defer resp.Body.Close()
-
-			decoder := json.NewDecoder(resp.Body)
+		value, err = func(domain string) (string, error) {
 			dnsresponse := DnsResponse{}
-			err = decoder.Decode(&dnsresponse)
+			resp, err := base.New().Get(fmt.Sprintf(GandiARecordUrl, domain)).
+				ReceiveSuccess(&dnsresponse)
 			if err != nil {
-				return "", err
+				return "", fmt.Errorf("requesting gandi dns info: %v", err)
+			}
+			if resp.StatusCode < 200 || resp.StatusCode > 299 {
+				return "", fmt.Errorf("requesting gandi dns info, no 2xx http status code: %d", resp.StatusCode)
+			}
+			if len(dnsresponse.Values) == 0 {
+				return "", fmt.Errorf("no values in dnsresponse")
 			}
 			return dnsresponse.Values[0], nil
-		}(configuration, domain)
+		}(domain)
 		if err != nil {
 			log.Warnln(fmt.Sprintf("Error while getting current ip from gandi : %v", err))
 			time.Sleep(30 * time.Second)
@@ -201,31 +203,21 @@ func GetCurrentIp(configuration Configuration, domain string) (string, error) {
 	return value, nil
 }
 
-func SetCurrentIp(newip string, domain string, configuration Configuration) error {
-	url := fmt.Sprintf(GandiARecordUrl, domain)
-	log.Infoln("URL:>", url)
-
-	var str = fmt.Sprintf("{\"rrset_ttl\": %d,\"rrset_values\": [\"%s\"]}", 600, newip)
-	log.Infoln("json:", str)
-	var jsonStr = []byte(str)
-	req, err := http.NewRequest("PUT", url, bytes.NewBuffer(jsonStr))
+func SetCurrentIp(newip string, domain string) error {
+	resp, err := base.New().Put(fmt.Sprintf(GandiARecordUrl, domain)).
+		BodyJSON(struct {
+			TTL    int      `json:"rrset_ttl"`
+			Values []string `json:"rrset_values"`
+		}{
+			TTL:    600,
+			Values: []string{newip},
+		}).ReceiveSuccess(nil)
 	if err != nil {
-		return err
+		return fmt.Errorf("setting gandi dns info: %v", err)
 	}
-	req.Header.Set("X-Api-Key", configuration.GandiKey)
-	req.Header.Set("Content-Type", "application/json")
-
-	client := &http.Client{}
-	resp, err := client.Do(req)
-	if err != nil {
-		return err
+	if resp.StatusCode < 200 || resp.StatusCode > 299 {
+		return fmt.Errorf("setting gandi dns info, no 2xx http status code: %d", resp.StatusCode)
 	}
-	defer resp.Body.Close()
-
-	log.Debugln("response Status:", resp.Status)
-	log.Debugln("response Headers:", resp.Header)
-	body, _ := ioutil.ReadAll(resp.Body)
-	log.Debugln("response Body:", string(body))
 	return nil
 }
 
@@ -236,22 +228,21 @@ func GetOutboundIP() (string, error) {
 	}
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("creating http request: %v", err)
 	}
 	if configuration.RouterLogin != "" && configuration.RouterPassword != "" {
 		req.SetBasicAuth(configuration.RouterLogin, configuration.RouterPassword)
 	}
 	res, err := http.DefaultClient.Do(req)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("executing http request: %v", err)
 	}
 	defer res.Body.Close()
 	body, err := ioutil.ReadAll(res.Body)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("reading response body: %v", err)
 	}
 
-	log.Debugln(string(body))
 	wanipregex := configuration.WanIPRegex
 	if wanipregex == "" {
 		wanipregex = "wan_ipaddr::([0-9.]*)}"