# Extending OpenAPI

There are some cases where you might need to modify the generated OpenAPI schema.

In this section you will see how.

## The normal process

The normal (default) process, is as follows.

A `FastAPI` application (instance) has an `.openapi()` method that is expected to return the OpenAPI schema.

  * Replicate a service definition and change the name of the new service appropriately.
  * Update the command section in each service.
  * Add a new MinIO server instance to the upstream directive in the Nginx configuration file.

## Andere Middlewares

Sie können später mehr über andere Middlewares in [Handbuch für fortgeschrittene Benutzer: Fortgeschrittene Middleware](../advanced/middleware.md){.internal-link target=_blank} lesen.

@ElementTypesAreNonnullByDefault
public final class InetAddresses {
  private static final int IPV4_PART_COUNT = 4;
  private static final int IPV6_PART_COUNT = 8;
  private static final char IPV4_DELIMITER = '.';
  private static final char IPV6_DELIMITER = ':';
  private static final CharMatcher IPV4_DELIMITER_MATCHER = CharMatcher.is(IPV4_DELIMITER);
  private static final CharMatcher IPV6_DELIMITER_MATCHER = CharMatcher.is(IPV6_DELIMITER);

 * the License.
 */

package com.google.common.primitives;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;

import com.google.common.annotations.GwtCompatible;

 * the License.
 */

package com.google.common.primitives;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;

import com.google.common.annotations.GwtCompatible;

 * the License.
 */

package com.google.common.primitives;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkElementIndex;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndexes;

import com.google.common.annotations.GwtCompatible;

package com.google.common.collect;

import static com.google.common.collect.MapMakerInternalMap.Strength.STRONG;
import static com.google.common.collect.MapMakerInternalMap.Strength.WEAK;
import static com.google.common.testing.SerializableTester.reserializeAndAssert;
import static java.util.Arrays.asList;
import static org.junit.Assert.assertThrows;
import static org.mockito.ArgumentMatchers.isA;
import static org.mockito.Mockito.eq;

 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.io;

import static com.google.common.io.Files.simplifyPath;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import java.io.IOException;
import java.net.URL;

 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.io;

import static com.google.common.io.Files.simplifyPath;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import java.io.IOException;
import java.net.URL;