fix(http): fix /ready response content type

http/ready.go

@@ -13,6 +13,7 @@ import (
 func ReadyHandler() http.Handler {
 	up := time.Now()
 	fn := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		w.WriteHeader(http.StatusOK)
 
 		var status = struct {

http/ready_test.go

@@ -0,0 +1,40 @@
+package http
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestReadyHandler(t *testing.T) {
+	w := httptest.NewRecorder()
+	r := httptest.NewRequest(http.MethodGet, "/health", nil)
+	ReadyHandler().ServeHTTP(w, r)
+	res := w.Result()
+	contentType := res.Header.Get("Content-Type")
+	body, _ := ioutil.ReadAll(res.Body)
+
+	if res.StatusCode != 200 {
+		t.Errorf("TestReadyHandler. ReadyHandler() StatusCode = %v, want 200", res.StatusCode)
+	}
+	if !strings.HasPrefix(contentType, "application/json") {
+		t.Errorf("TestReadyHandler. ReadyHandler() Content-Type = %v, want application/json", contentType)
+	}
+	var content map[string]interface{}
+	if err := json.Unmarshal(body, &content); err != nil {
+		t.Errorf("TestReadyHandler. ReadyHandler() error unmarshaling json body %v", err)
+		return
+	}
+	if val := content["status"]; val != "ready" {
+		t.Errorf("TestReadyHandler. ReadyHandler() .status = %v, want 'ready'", val)
+	}
+	if val := content["started"]; val == nil {
+		t.Errorf("TestReadyHandler. ReadyHandler() .started is not returned")
+	}
+	if val := content["up"]; val == nil {
+		t.Errorf("TestReadyHandler. ReadyHandler() .up is not returned")
+	}
+}