[python-nextgen] Fix binary response (#15076)

* fix binary response in python nextgen client

* update samples

samples/client/echo_api/java/native/src/main/java/org/openapitools/client/api/BodyApi.java

@@ -17,6 +17,7 @@ import org.openapitools.client.ApiException;
 import org.openapitools.client.ApiResponse;
 import org.openapitools.client.Pair;
 
+import java.io.File;
 import org.openapitools.client.model.Pet;
 
 import com.fasterxml.jackson.core.type.TypeReference;
@@ -81,6 +82,71 @@ public class BodyApi {
     return operationId + " call failed with: " + statusCode + " - " + body;
   }
 
+  /**
+   * Test binary (gif) response body
+   * Test binary (gif) response body
+   * @return File
+   * @throws ApiException if fails to make API call
+   */
+  public File testBinaryGif() throws ApiException {
+    ApiResponse<File> localVarResponse = testBinaryGifWithHttpInfo();
+    return localVarResponse.getData();
+  }
+
+  /**
+   * Test binary (gif) response body
+   * Test binary (gif) response body
+   * @return ApiResponse&lt;File&gt;
+   * @throws ApiException if fails to make API call
+   */
+  public ApiResponse<File> testBinaryGifWithHttpInfo() throws ApiException {
+    HttpRequest.Builder localVarRequestBuilder = testBinaryGifRequestBuilder();
+    try {
+      HttpResponse<InputStream> localVarResponse = memberVarHttpClient.send(
+          localVarRequestBuilder.build(),
+          HttpResponse.BodyHandlers.ofInputStream());
+      if (memberVarResponseInterceptor != null) {
+        memberVarResponseInterceptor.accept(localVarResponse);
+      }
+      try {
+        if (localVarResponse.statusCode()/ 100 != 2) {
+          throw getApiException("testBinaryGif", localVarResponse);
+        }
+        return new ApiResponse<File>(
+          localVarResponse.statusCode(),
+          localVarResponse.headers().map(),
+          localVarResponse.body() == null ? null : memberVarObjectMapper.readValue(localVarResponse.body(), new TypeReference<File>() {}) // closes the InputStream
+        );
+      } finally {
+      }
+    } catch (IOException e) {
+      throw new ApiException(e);
+    }
+    catch (InterruptedException e) {
+      Thread.currentThread().interrupt();
+      throw new ApiException(e);
+    }
+  }
+
+  private HttpRequest.Builder testBinaryGifRequestBuilder() throws ApiException {
+
+    HttpRequest.Builder localVarRequestBuilder = HttpRequest.newBuilder();
+
+    String localVarPath = "/binary/gif";
+
+    localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
+
+    localVarRequestBuilder.header("Accept", "image/gif");
+
+    localVarRequestBuilder.method("POST", HttpRequest.BodyPublishers.noBody());
+    if (memberVarReadTimeout != null) {
+      localVarRequestBuilder.timeout(memberVarReadTimeout);
+    }
+    if (memberVarInterceptor != null) {
+      memberVarInterceptor.accept(localVarRequestBuilder);
+    }
+    return localVarRequestBuilder;
+  }
   /**
    * Test body parameter(s)
    * Test body parameter(s)