diff --git a/microsservicos-aula-1/README.md b/microsservicos-aula-1/README.md
new file mode 100644
index 0000000..195ebda
--- /dev/null
+++ b/microsservicos-aula-1/README.md
@@ -0,0 +1,5 @@
+# Desafio 01
+
+Foi criado um microserviço de número 4 na linguagem Golang, serviço esse à ser consumido pelo microserviço de número 3.
+
+O microserviço de número 4 processará as requisições enviadas para a porta 9093.
\ No newline at end of file
diff --git a/microsservicos-aula-1/c/c.go b/microsservicos-aula-1/c/c.go
index 68690b1..1a4e482 100644
--- a/microsservicos-aula-1/c/c.go
+++ b/microsservicos-aula-1/c/c.go
@@ -3,8 +3,12 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
+	"net/url"
+
+	"github.com/hashicorp/go-retryablehttp"
 )
 
 type Coupon struct {
@@ -31,6 +35,7 @@ type Result struct {
 var coupons Coupons
 
 func main() {
+
 	coupon := Coupon{
 		Code: "abc",
 	}
@@ -39,9 +44,11 @@ func main() {
 
 	http.HandleFunc("/", home)
 	http.ListenAndServe(":9092", nil)
+
 }
 
 func home(w http.ResponseWriter, r *http.Request) {
+
 	coupon := r.PostFormValue("coupon")
 	valid := coupons.Check(coupon)
 
@@ -52,6 +59,45 @@ func home(w http.ResponseWriter, r *http.Request) {
 		log.Fatal("Error converting json")
 	}
 
+	resultMicroservice4 := makeHttpCall("http://localhost:9093", "teste desafio microserviço 4")
+
+	jsonResultMicroService, errMicroService := json.Marshal(resultMicroservice4)
+	if errMicroService != nil {
+		log.Fatal("Error converting json")
+	}
+
+	log.Printf(resultMicroservice4.Status)
+
+	fmt.Fprintf(w, string(jsonResultMicroService))
 	fmt.Fprintf(w, string(jsonResult))
 
-}
\ No newline at end of file
+}
+
+func makeHttpCall(urlMicroservice string, coupon string) Result {
+
+	values := url.Values{}
+	values.Add("coupon", coupon)
+
+	retryClient := retryablehttp.NewClient()
+	retryClient.RetryMax = 5
+
+	res, err := retryClient.PostForm(urlMicroservice, values)
+	if err != nil {
+		result := Result{Status: "Servidor fora do ar!"}
+		return result
+	}
+
+	defer res.Body.Close()
+
+	data, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		log.Fatal("Error processing result")
+	}
+
+	result := Result{}
+
+	json.Unmarshal(data, &result)
+
+	return result
+
+}
diff --git a/microsservicos-aula-1/d/d.go b/microsservicos-aula-1/d/d.go
new file mode 100644
index 0000000..564d3b7
--- /dev/null
+++ b/microsservicos-aula-1/d/d.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+func main() {
+	http.HandleFunc("/", home)
+	http.ListenAndServe(":9093", nil)
+}
+
+type Result struct {
+	Status string
+}
+
+func home(w http.ResponseWriter, r *http.Request) {
+
+	log.Printf("Requisição recebida!")
+
+	result := Result{Status: "teste microserviço 4"}
+
+	jsonResult, err := json.Marshal(result)
+	if err != nil {
+		log.Fatal("Error converting json")
+	}
+
+	fmt.Fprintf(w, string(jsonResult))
+
+}