Add test cases to cover different collection formats (#3640)

* add test cases to cover different collection format

* add space params to retrofit 1.x

* add space params to retrofit 2.x

* rename url to localVarUrl

* fix exception in haskell servant

samples/client/petstore/java/resttemplate-withXml/docs/FakeApi.md

@@ -17,6 +17,7 @@ Method | HTTP request | Description
 [**testGroupParameters**](FakeApi.md#testGroupParameters) | **DELETE** /fake | Fake endpoint to test group parameters (optional)
 [**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
+[**testQueryParameterCollectionFormat**](FakeApi.md#testQueryParameterCollectionFormat) | **PUT** /fake/test-query-paramters | 
 
 
 
@@ -912,3 +913,75 @@ No authorization required
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 
+
+## testQueryParameterCollectionFormat
+
+> testQueryParameterCollectionFormat(pipe, ioutil, http, url, context)
+
+
+
+To test the collection format in query parameters
+
+### Example
+
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.FakeApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://petstore.swagger.io:80/v2");
+
+        FakeApi apiInstance = new FakeApi(defaultClient);
+        List<String> pipe = Arrays.asList(); // List<String> | 
+        List<String> ioutil = Arrays.asList(); // List<String> | 
+        List<String> http = Arrays.asList(); // List<String> | 
+        List<String> url = Arrays.asList(); // List<String> | 
+        List<String> context = Arrays.asList(); // List<String> | 
+        try {
+            apiInstance.testQueryParameterCollectionFormat(pipe, ioutil, http, url, context);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling FakeApi#testQueryParameterCollectionFormat");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **pipe** | [**List&lt;String&gt;**](String.md)|  |
+ **ioutil** | [**List&lt;String&gt;**](String.md)|  |
+ **http** | [**List&lt;String&gt;**](String.md)|  |
+ **url** | [**List&lt;String&gt;**](String.md)|  |
+ **context** | [**List&lt;String&gt;**](String.md)|  |
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** | Success |  -  |
+