import java.security.PublicKey
import java.security.SecureRandom
import java.security.Signature
import java.security.cert.X509Certificate
import java.security.interfaces.ECPublicKey
import java.security.interfaces.RSAPrivateKey
import java.security.interfaces.RSAPublicKey
import java.security.spec.PKCS8EncodedKeySpec
import java.util.UUID
import java.util.concurrent.TimeUnit
import okhttp3.internal.canParseAsIpAddress

<img src="/img/tutorial/sub-applications/image02.png">

If you try interacting with any of the two user interfaces, they will work correctly, because the browser will be able to talk to each specific app or sub-app.

### Technical Details: `root_path`

import com.google.common.collect.testing.testers.CollectionToStringTester;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * Abstract superclass of all test-suite builders for collection interfaces.
 *
 * @author George van den Driessche
 */
@GwtIncompatible
public abstract class AbstractCollectionTestSuiteBuilder<
        B extends AbstractCollectionTestSuiteBuilder<B, E>, E>

## OpenAPI Docs URLs

            parse(f, repository)
            counter++
        }

        //updating/modifying the metadata and making sure every type reference across the metadata is fully qualified
        //so, the superClassName, interfaces and types needed by declared properties and declared methods will have fully qualified name
        TypeNameResolver resolver = new TypeNameResolver(repository)
        repository.each { name, metaData ->

    if (!path.endsWith(".class")) {
        throw IllegalArgumentException("Not a class file: $path")
    }
    inputStream().use {
        val reader = ClassReader(it)
        return setOf(reader.superName) + reader.interfaces
    }

///

It will:

* Return that status code in the response.
* Document it as such in the OpenAPI schema (and so, in the user interfaces):

<img src="/img/tutorial/response-status-code/image01.png">

/// note

Some response codes (see the next section) indicate that the response does not have a body.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Collection interfaces and implementations, and other utilities for collections. This package is a
 * part of the open-source <a href="https://github.com/google/guava">Guava</a> library.
 *
 * <p>The classes in this package include:
 *

//// tab | Python 3.8+

```Python hl_lines="17  22  27"
{!> ../../docs_src/path_operation_configuration/tutorial002.py!}
```

////

They will be added to the OpenAPI schema and used by the automatic documentation interfaces:

<img src="/img/tutorial/path-operation-configuration/image01.png">

### Tags with Enums

**FastAPI** é baseado no **OpenAPI**.

Isso é o que torna possível ter múltiplas automações interativas de interfaces de documentação, geração de código, etc.

OpenAPI tem uma forma para definir múltiplos “esquemas” de segurança.