nats discovery

tools/remote_caller.go

@@ -77,7 +77,7 @@ func (caller *HTTPCaller) CallPost(url string, subpath string, body map[string]i
 	postBody, _ := json.Marshal(body)
 	responseBody := bytes.NewBuffer(postBody)
 	resp, err := http.Post(url+subpath, "application/json", responseBody)
-	if err != nil {
+	if err != nil || resp == nil || resp.Body == nil {
 		return nil, err
 	}
 	defer resp.Body.Close()