diff --git a/samples/client/petstore/javascript-es6/README.md b/samples/client/petstore/javascript-es6/README.md
index 7d74305e7ce..bbf7a369ff4 100644
--- a/samples/client/petstore/javascript-es6/README.md
+++ b/samples/client/petstore/javascript-es6/README.md
@@ -100,6 +100,7 @@ Class | Method | HTTP request | Description
 *SwaggerPetstore.FakeApi* | [**testClientModel**](docs/FakeApi.md#testClientModel) | **PATCH** /fake | To test \"client\" model
 *SwaggerPetstore.FakeApi* | [**testEndpointParameters**](docs/FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 *SwaggerPetstore.FakeApi* | [**testEnumParameters**](docs/FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+*SwaggerPetstore.FakeApi* | [**testInlineAdditionalProperties**](docs/FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 *SwaggerPetstore.FakeApi* | [**testJsonFormData**](docs/FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 *SwaggerPetstore.FakeClassnameTags123Api* | [**testClassname**](docs/FakeClassnameTags123Api.md#testClassname) | **PATCH** /fake_classname_test | To test class name in snake case
 *SwaggerPetstore.PetApi* | [**addPet**](docs/PetApi.md#addPet) | **POST** /pet | Add a new pet to the store
diff --git a/samples/client/petstore/javascript-es6/docs/FakeApi.md b/samples/client/petstore/javascript-es6/docs/FakeApi.md
index 037f5a2a9b0..cafe836d687 100644
--- a/samples/client/petstore/javascript-es6/docs/FakeApi.md
+++ b/samples/client/petstore/javascript-es6/docs/FakeApi.md
@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \"client\" model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumParameters**](FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+[**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -385,6 +386,51 @@ No authorization required
  - **Content-Type**: */*
  - **Accept**: */*
 
+<a name="testInlineAdditionalProperties"></a>
+# **testInlineAdditionalProperties**
+> testInlineAdditionalProperties(param)
+
+test inline additionalProperties
+
+
+
+### Example
+```javascript
+import SwaggerPetstore from 'swagger_petstore';
+
+let apiInstance = new SwaggerPetstore.FakeApi();
+
+let param = null; // Object | request body
+
+
+apiInstance.testInlineAdditionalProperties(param, (error, data, response) => {
+  if (error) {
+    console.error(error);
+  } else {
+    console.log('API called successfully.');
+  }
+});
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **Object**| request body | 
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
 <a name="testJsonFormData"></a>
 # **testJsonFormData**
 > testJsonFormData(param, param2)
diff --git a/samples/client/petstore/javascript-es6/src/ApiClient.js b/samples/client/petstore/javascript-es6/src/ApiClient.js
index a2556b62caa..11497febbe9 100644
--- a/samples/client/petstore/javascript-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-es6/src/ApiClient.js
@@ -83,6 +83,12 @@ export default class ApiClient {
         if (typeof window === 'undefined') {
           this.agent = new superagent.agent();
         }
+
+        /*
+         * Allow user to override superagent agent
+         */
+         this.requestAgent = null;
+
     }
 
     /**
@@ -398,6 +404,11 @@ export default class ApiClient {
         // set header parameters
         request.set(this.defaultHeaders).set(this.normalizeParams(headerParams));
 
+        // set requestAgent if it is set by user
+        if (this.requestAgent) {
+          request.agent(this.requestAgent);
+        }
+
         // set request timeout
         request.timeout(this.timeout);
 
diff --git a/samples/client/petstore/javascript-es6/src/api/FakeApi.js b/samples/client/petstore/javascript-es6/src/api/FakeApi.js
index 99741813c03..1a5f16e94bc 100644
--- a/samples/client/petstore/javascript-es6/src/api/FakeApi.js
+++ b/samples/client/petstore/javascript-es6/src/api/FakeApi.js
@@ -391,6 +391,50 @@ export default class FakeApi {
       );
     }
 
+    /**
+     * Callback function to receive the result of the testInlineAdditionalProperties operation.
+     * @callback module:api/FakeApi~testInlineAdditionalPropertiesCallback
+     * @param {String} error Error message, if any.
+     * @param data This operation does not return a value.
+     * @param {String} response The complete HTTP response.
+     */
+
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @param {module:api/FakeApi~testInlineAdditionalPropertiesCallback} callback The callback function, accepting three arguments: error, data, response
+     */
+    testInlineAdditionalProperties(param, callback) {
+      let postBody = param;
+
+      // verify the required parameter 'param' is set
+      if (param === undefined || param === null) {
+        throw new Error("Missing the required parameter 'param' when calling testInlineAdditionalProperties");
+      }
+
+
+      let pathParams = {
+      };
+      let queryParams = {
+      };
+      let headerParams = {
+      };
+      let formParams = {
+      };
+
+      let authNames = [];
+      let contentTypes = ['application/json'];
+      let accepts = [];
+      let returnType = null;
+
+      return this.apiClient.callApi(
+        '/fake/inline-additionalProperties', 'POST',
+        pathParams, queryParams, headerParams, formParams, postBody,
+        authNames, contentTypes, accepts, returnType, callback
+      );
+    }
+
     /**
      * Callback function to receive the result of the testJsonFormData operation.
      * @callback module:api/FakeApi~testJsonFormDataCallback
diff --git a/samples/client/petstore/javascript-promise-es6/README.md b/samples/client/petstore/javascript-promise-es6/README.md
index c668dfd721f..67af003b88d 100644
--- a/samples/client/petstore/javascript-promise-es6/README.md
+++ b/samples/client/petstore/javascript-promise-es6/README.md
@@ -97,6 +97,7 @@ Class | Method | HTTP request | Description
 *SwaggerPetstore.FakeApi* | [**testClientModel**](docs/FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 *SwaggerPetstore.FakeApi* | [**testEndpointParameters**](docs/FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 *SwaggerPetstore.FakeApi* | [**testEnumParameters**](docs/FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+*SwaggerPetstore.FakeApi* | [**testInlineAdditionalProperties**](docs/FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 *SwaggerPetstore.FakeApi* | [**testJsonFormData**](docs/FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 *SwaggerPetstore.FakeClassnameTags123Api* | [**testClassname**](docs/FakeClassnameTags123Api.md#testClassname) | **PATCH** /fake_classname_test | To test class name in snake case
 *SwaggerPetstore.PetApi* | [**addPet**](docs/PetApi.md#addPet) | **POST** /pet | Add a new pet to the store
diff --git a/samples/client/petstore/javascript-promise-es6/docs/FakeApi.md b/samples/client/petstore/javascript-promise-es6/docs/FakeApi.md
index 41d3591a9bb..366f5ff7bed 100644
--- a/samples/client/petstore/javascript-promise-es6/docs/FakeApi.md
+++ b/samples/client/petstore/javascript-promise-es6/docs/FakeApi.md
@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumParameters**](FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+[**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -371,6 +372,49 @@ No authorization required
  - **Content-Type**: */*
  - **Accept**: */*
 
+<a name="testInlineAdditionalProperties"></a>
+# **testInlineAdditionalProperties**
+> testInlineAdditionalProperties(param)
+
+test inline additionalProperties
+
+
+
+### Example
+```javascript
+import SwaggerPetstore from 'swagger_petstore';
+
+let apiInstance = new SwaggerPetstore.FakeApi();
+
+let param = null; // Object | request body
+
+apiInstance.testInlineAdditionalProperties(param).then(() => {
+  console.log('API called successfully.');
+}, (error) => {
+  console.error(error);
+});
+
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **Object**| request body | 
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
 <a name="testJsonFormData"></a>
 # **testJsonFormData**
 > testJsonFormData(param, param2)
diff --git a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
index b68c9055546..a6a1dddd8ef 100644
--- a/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise-es6/src/ApiClient.js
@@ -83,6 +83,12 @@ export default class ApiClient {
         if (typeof window === 'undefined') {
           this.agent = new superagent.agent();
         }
+
+        /*
+         * Allow user to override superagent agent
+         */
+         this.requestAgent = null;
+
     }
 
     /**
@@ -391,6 +397,11 @@ export default class ApiClient {
         // set header parameters
         request.set(this.defaultHeaders).set(this.normalizeParams(headerParams));
 
+        // set requestAgent if it is set by user
+        if (this.requestAgent) {
+          request.agent(this.requestAgent);
+        }
+
         // set request timeout
         request.timeout(this.timeout);
 
diff --git a/samples/client/petstore/javascript-promise-es6/src/api/FakeApi.js b/samples/client/petstore/javascript-promise-es6/src/api/FakeApi.js
index 9bcf6796fa3..0b0b8a1a816 100644
--- a/samples/client/petstore/javascript-promise-es6/src/api/FakeApi.js
+++ b/samples/client/petstore/javascript-promise-es6/src/api/FakeApi.js
@@ -451,6 +451,56 @@ export default class FakeApi {
     }
 
 
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @return {Promise} a {@link https://www.promisejs.org/|Promise}, with an object containing HTTP response
+     */
+    testInlineAdditionalPropertiesWithHttpInfo(param) {
+      let postBody = param;
+
+      // verify the required parameter 'param' is set
+      if (param === undefined || param === null) {
+        throw new Error("Missing the required parameter 'param' when calling testInlineAdditionalProperties");
+      }
+
+
+      let pathParams = {
+      };
+      let queryParams = {
+      };
+      let headerParams = {
+      };
+      let formParams = {
+      };
+
+      let authNames = [];
+      let contentTypes = ['application/json'];
+      let accepts = [];
+      let returnType = null;
+
+      return this.apiClient.callApi(
+        '/fake/inline-additionalProperties', 'POST',
+        pathParams, queryParams, headerParams, formParams, postBody,
+        authNames, contentTypes, accepts, returnType
+      );
+    }
+
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @return {Promise} a {@link https://www.promisejs.org/|Promise}
+     */
+    testInlineAdditionalProperties(param) {
+      return this.testInlineAdditionalPropertiesWithHttpInfo(param)
+        .then(function(response_and_data) {
+          return response_and_data.data;
+        });
+    }
+
+
     /**
      * test json serialization of form data
      * 
diff --git a/samples/client/petstore/javascript-promise/README.md b/samples/client/petstore/javascript-promise/README.md
index 35942f17ef6..3dbc2e674d8 100644
--- a/samples/client/petstore/javascript-promise/README.md
+++ b/samples/client/petstore/javascript-promise/README.md
@@ -122,6 +122,7 @@ Class | Method | HTTP request | Description
 *SwaggerPetstore.FakeApi* | [**testClientModel**](docs/FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 *SwaggerPetstore.FakeApi* | [**testEndpointParameters**](docs/FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 *SwaggerPetstore.FakeApi* | [**testEnumParameters**](docs/FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+*SwaggerPetstore.FakeApi* | [**testInlineAdditionalProperties**](docs/FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 *SwaggerPetstore.FakeApi* | [**testJsonFormData**](docs/FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 *SwaggerPetstore.FakeClassnameTags123Api* | [**testClassname**](docs/FakeClassnameTags123Api.md#testClassname) | **PATCH** /fake_classname_test | To test class name in snake case
 *SwaggerPetstore.PetApi* | [**addPet**](docs/PetApi.md#addPet) | **POST** /pet | Add a new pet to the store
diff --git a/samples/client/petstore/javascript-promise/docs/FakeApi.md b/samples/client/petstore/javascript-promise/docs/FakeApi.md
index 52969139d4b..8fd0dc0a6d9 100644
--- a/samples/client/petstore/javascript-promise/docs/FakeApi.md
+++ b/samples/client/petstore/javascript-promise/docs/FakeApi.md
@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumParameters**](FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+[**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -371,6 +372,49 @@ No authorization required
  - **Content-Type**: */*
  - **Accept**: */*
 
+<a name="testInlineAdditionalProperties"></a>
+# **testInlineAdditionalProperties**
+> testInlineAdditionalProperties(param)
+
+test inline additionalProperties
+
+
+
+### Example
+```javascript
+var SwaggerPetstore = require('swagger_petstore');
+
+var apiInstance = new SwaggerPetstore.FakeApi();
+
+var param = null; // Object | request body
+
+apiInstance.testInlineAdditionalProperties(param).then(function() {
+  console.log('API called successfully.');
+}, function(error) {
+  console.error(error);
+});
+
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **Object**| request body | 
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
 <a name="testJsonFormData"></a>
 # **testJsonFormData**
 > testJsonFormData(param, param2)
diff --git a/samples/client/petstore/javascript-promise/src/ApiClient.js b/samples/client/petstore/javascript-promise/src/ApiClient.js
index 0d8ec3e5007..691f409db9e 100644
--- a/samples/client/petstore/javascript-promise/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise/src/ApiClient.js
@@ -98,6 +98,10 @@
       this.agent = new superagent.agent();
     }
 
+    /*
+     * Allow user to override superagent agent
+     */
+    this.requestAgent = null;
   };
 
   /**
@@ -406,6 +410,12 @@
     // set header parameters
     request.set(this.defaultHeaders).set(this.normalizeParams(headerParams));
 
+
+    // set requestAgent if it is set by user
+    if (this.requestAgent) {
+      request.agent(this.requestAgent);
+    }
+
     // set request timeout
     request.timeout(this.timeout);
 
diff --git a/samples/client/petstore/javascript-promise/src/api/FakeApi.js b/samples/client/petstore/javascript-promise/src/api/FakeApi.js
index 0b3b9c24e2f..0f06c046e0e 100644
--- a/samples/client/petstore/javascript-promise/src/api/FakeApi.js
+++ b/samples/client/petstore/javascript-promise/src/api/FakeApi.js
@@ -478,6 +478,58 @@
     }
 
 
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @return {Promise} a {@link https://www.promisejs.org/|Promise}, with an object containing HTTP response
+     */
+    this.testInlineAdditionalPropertiesWithHttpInfo = function(param) {
+      var postBody = param;
+
+      // verify the required parameter 'param' is set
+      if (param === undefined || param === null) {
+        throw new Error("Missing the required parameter 'param' when calling testInlineAdditionalProperties");
+      }
+
+
+      var pathParams = {
+      };
+      var queryParams = {
+      };
+      var collectionQueryParams = {
+      };
+      var headerParams = {
+      };
+      var formParams = {
+      };
+
+      var authNames = [];
+      var contentTypes = ['application/json'];
+      var accepts = [];
+      var returnType = null;
+
+      return this.apiClient.callApi(
+        '/fake/inline-additionalProperties', 'POST',
+        pathParams, queryParams, collectionQueryParams, headerParams, formParams, postBody,
+        authNames, contentTypes, accepts, returnType
+      );
+    }
+
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @return {Promise} a {@link https://www.promisejs.org/|Promise}
+     */
+    this.testInlineAdditionalProperties = function(param) {
+      return this.testInlineAdditionalPropertiesWithHttpInfo(param)
+        .then(function(response_and_data) {
+          return response_and_data.data;
+        });
+    }
+
+
     /**
      * test json serialization of form data
      * 
diff --git a/samples/client/petstore/javascript/README.md b/samples/client/petstore/javascript/README.md
index 402689f894a..556caa6e87b 100644
--- a/samples/client/petstore/javascript/README.md
+++ b/samples/client/petstore/javascript/README.md
@@ -125,6 +125,7 @@ Class | Method | HTTP request | Description
 *SwaggerPetstore.FakeApi* | [**testClientModel**](docs/FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 *SwaggerPetstore.FakeApi* | [**testEndpointParameters**](docs/FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 *SwaggerPetstore.FakeApi* | [**testEnumParameters**](docs/FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+*SwaggerPetstore.FakeApi* | [**testInlineAdditionalProperties**](docs/FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 *SwaggerPetstore.FakeApi* | [**testJsonFormData**](docs/FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 *SwaggerPetstore.FakeClassnameTags123Api* | [**testClassname**](docs/FakeClassnameTags123Api.md#testClassname) | **PATCH** /fake_classname_test | To test class name in snake case
 *SwaggerPetstore.PetApi* | [**addPet**](docs/PetApi.md#addPet) | **POST** /pet | Add a new pet to the store
diff --git a/samples/client/petstore/javascript/docs/FakeApi.md b/samples/client/petstore/javascript/docs/FakeApi.md
index a4e995f4333..f9b086c52d5 100644
--- a/samples/client/petstore/javascript/docs/FakeApi.md
+++ b/samples/client/petstore/javascript/docs/FakeApi.md
@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \&quot;client\&quot; model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumParameters**](FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+[**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -392,6 +393,52 @@ No authorization required
  - **Content-Type**: */*
  - **Accept**: */*
 
+<a name="testInlineAdditionalProperties"></a>
+# **testInlineAdditionalProperties**
+> testInlineAdditionalProperties(param)
+
+test inline additionalProperties
+
+
+
+### Example
+```javascript
+var SwaggerPetstore = require('swagger_petstore');
+
+var apiInstance = new SwaggerPetstore.FakeApi();
+
+var param = null; // Object | request body
+
+
+var callback = function(error, data, response) {
+  if (error) {
+    console.error(error);
+  } else {
+    console.log('API called successfully.');
+  }
+};
+apiInstance.testInlineAdditionalProperties(param, callback);
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **Object**| request body | 
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
 <a name="testJsonFormData"></a>
 # **testJsonFormData**
 > testJsonFormData(param, param2)
diff --git a/samples/client/petstore/javascript/src/ApiClient.js b/samples/client/petstore/javascript/src/ApiClient.js
index 5ea52184385..246500eb3e4 100644
--- a/samples/client/petstore/javascript/src/ApiClient.js
+++ b/samples/client/petstore/javascript/src/ApiClient.js
@@ -98,6 +98,10 @@
       this.agent = new superagent.agent();
     }
 
+    /*
+     * Allow user to override superagent agent
+     */
+    this.requestAgent = null;
   };
 
   /**
@@ -415,6 +419,12 @@
     // set header parameters
     request.set(this.defaultHeaders).set(this.normalizeParams(headerParams));
 
+
+    // set requestAgent if it is set by user
+    if (this.requestAgent) {
+      request.agent(this.requestAgent);
+    }
+
     // set request timeout
     request.timeout(this.timeout);
 
diff --git a/samples/client/petstore/javascript/src/api/FakeApi.js b/samples/client/petstore/javascript/src/api/FakeApi.js
index f7621dc00c9..81ac51959d8 100644
--- a/samples/client/petstore/javascript/src/api/FakeApi.js
+++ b/samples/client/petstore/javascript/src/api/FakeApi.js
@@ -418,6 +418,52 @@
       );
     }
 
+    /**
+     * Callback function to receive the result of the testInlineAdditionalProperties operation.
+     * @callback module:api/FakeApi~testInlineAdditionalPropertiesCallback
+     * @param {String} error Error message, if any.
+     * @param data This operation does not return a value.
+     * @param {String} response The complete HTTP response.
+     */
+
+    /**
+     * test inline additionalProperties
+     * 
+     * @param {Object} param request body
+     * @param {module:api/FakeApi~testInlineAdditionalPropertiesCallback} callback The callback function, accepting three arguments: error, data, response
+     */
+    this.testInlineAdditionalProperties = function(param, callback) {
+      var postBody = param;
+
+      // verify the required parameter 'param' is set
+      if (param === undefined || param === null) {
+        throw new Error("Missing the required parameter 'param' when calling testInlineAdditionalProperties");
+      }
+
+
+      var pathParams = {
+      };
+      var queryParams = {
+      };
+      var collectionQueryParams = {
+      };
+      var headerParams = {
+      };
+      var formParams = {
+      };
+
+      var authNames = [];
+      var contentTypes = ['application/json'];
+      var accepts = [];
+      var returnType = null;
+
+      return this.apiClient.callApi(
+        '/fake/inline-additionalProperties', 'POST',
+        pathParams, queryParams, collectionQueryParams, headerParams, formParams, postBody,
+        authNames, contentTypes, accepts, returnType, callback
+      );
+    }
+
     /**
      * Callback function to receive the result of the testJsonFormData operation.
      * @callback module:api/FakeApi~testJsonFormDataCallback