diff --git a/modules/swagger-codegen/src/main/resources/go/api_client.mustache b/modules/swagger-codegen/src/main/resources/go/api_client.mustache
index 06470ba06d6..def951e7c41 100644
--- a/modules/swagger-codegen/src/main/resources/go/api_client.mustache
+++ b/modules/swagger-codegen/src/main/resources/go/api_client.mustache
@@ -2,6 +2,8 @@ package {{packageName}}
 
 import (
     "strings"
+    "github.com/go-resty/resty"
+    "errors"
 )
 
 type ApiClient struct {
@@ -38,4 +40,59 @@ func contains(source []string, containvalue string) bool {
         }
     }
     return false
+}
+
+func CallApiAsync(path string, method string,
+    postBody interface{},
+    headerParams map[string]string,
+    queryParams map[string]string,
+    formParams map[string]string,
+    fileParams map[string]string) (*resty.Response, error) {
+
+    request := prepareRequest(postBody, headerParams, queryParams, formParams, fileParams)
+
+    switch strings.ToUpper(method) {
+    case "GET":
+        response, err := request.Get(path)
+        return response, err
+    case "POST":
+        response, err := request.Post(path)
+        return response, err
+    case "PUT":
+        response, err := request.Put(path)
+        return response, err
+    case "PATCH":
+        response, err := request.Patch(path)
+        return response, err
+    case "DELETE":
+        response, err := request.Delete(path)
+        return response, err
+    }
+
+    return nil, errors.New("Invalid method " + method)
+}
+
+func prepareRequest(postBody interface{},
+    headerParams map[string]string,
+    queryParams map[string]string,
+    formParams map[string]string,
+    fileParams map[string]string) *resty.Request {
+
+    request := resty.R()
+
+    request.SetBody(postBody)
+
+    // add header parameter, if any
+    request.SetHeaders(headerParams)
+
+    // add query parameter, if any
+    request.SetQueryParams(queryParams)
+
+    // add form parameter, if any
+    request.SetFormData(formParams)
+
+    // add file parameter, if any
+    request.SetFiles(fileParams)
+
+    return request
 }
\ No newline at end of file
diff --git a/samples/client/petstore/go/swagger/api_client.go b/samples/client/petstore/go/swagger/api_client.go
index 9806ccdf38d..92114983bdd 100644
--- a/samples/client/petstore/go/swagger/api_client.go
+++ b/samples/client/petstore/go/swagger/api_client.go
@@ -2,6 +2,8 @@ package swagger
 
 import (
     "strings"
+    "github.com/go-resty/resty"
+    "errors"
 )
 
 type ApiClient struct {
@@ -38,4 +40,59 @@ func contains(source []string, containvalue string) bool {
         }
     }
     return false
+}
+
+func CallApiAsync(path string, method string,
+    postBody interface{},
+    headerParams map[string]string,
+    queryParams map[string]string,
+    formParams map[string]string,
+    fileParams map[string]string) (*resty.Response, error) {
+
+    request := prepareRequest(postBody, headerParams, queryParams, formParams, fileParams)
+
+    switch strings.ToUpper(method) {
+    case "GET":
+        response, err := request.Get(path)
+        return response, err
+    case "POST":
+        response, err := request.Post(path)
+        return response, err
+    case "PUT":
+        response, err := request.Put(path)
+        return response, err
+    case "PATCH":
+        response, err := request.Patch(path)
+        return response, err
+    case "DELETE":
+        response, err := request.Delete(path)
+        return response, err
+    }
+
+    return nil, errors.New("Invalid method " + method)
+}
+
+func prepareRequest(postBody interface{},
+    headerParams map[string]string,
+    queryParams map[string]string,
+    formParams map[string]string,
+    fileParams map[string]string) *resty.Request {
+
+    request := resty.R()
+
+    request.SetBody(postBody)
+
+    // add header parameter, if any
+    request.SetHeaders(headerParams)
+
+    // add query parameter, if any
+    request.SetQueryParams(queryParams)
+
+    // add form parameter, if any
+    request.SetFormData(formParams)
+
+    // add file parameter, if any
+    request.SetFiles(fileParams)
+
+    return request
 }
\ No newline at end of file