Because we are using a relative URL, if your API was located at `https://example.com/`, then it would refer to `https://example.com/token`. But if your API was located at `https://example.com/api/v1/`, then it would refer to `https://example.com/api/v1/token`.

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}


### `Union` in Python 3.10 { #union-in-python-3-10 }

In this example we pass `Union[PlaneItem, CarItem]` as the value of the argument `response_model`.

objectClass: inetOrgPerson
cn: Alice Smith
sn: Smith
uid: alice1
mail: alice@example.io
userPassword: {SSHA}Yeh2/IV/q/HjG2yzN3YdE9CAF3EJFCLu

dn: uid=bobfisher,ou=people,ou=hwengg,dc=min,dc=io
objectClass: inetOrgPerson
cn: Robert Fisher
sn: Fisher
uid: bobfisher
mail: bob@example.io
userPassword: {SSHA}LktfbhK5oXSdDWCNzauJ9JA+Poxinl3y

dn: uid=cody3,ou=people,ou=hwengg,dc=min,dc=io

    .addInterceptor(new LoggingInterceptor())
    .build();

Request request = new Request.Builder()
    .url("http://www.publicobject.com/helloworld.txt")
    .header("User-Agent", "OkHttp Example")
    .build();

Response response = client.newCall(request).execute();
response.body().close();
```

That's why in this example we have to declare it in the `response_model` parameter.

...but continue reading below to see how to overcome that.

## Return Type and Data Filtering { #return-type-and-data-filtering }

Following is an example YAML configuration structure.
```yaml
version: v2
address: ":9000"
rootUser: "minioadmin"
rootPassword: "minioadmin"
console-address: ":9001"
certs-dir: "/home/user/.minio/certs/"
pools: # Specify the nodes and drives with pools
  - args:
      - "https://server-example-pool1:9000/mnt/disk{1...4}/"

## Use Case { #use-case }

Let's start with an example **use case** and then see how to solve it with this.

Let's imagine that you have some **machine learning models** that you want to use to handle requests. 🤖

    @Mock
    private CredentialsInternal credentialsInternal;
    @Mock
    private SmbTransportImpl transport;

    private SmbSessionImpl newSession() {
        return new SmbSessionImpl(cifsContext, "server.example", "EXAMPLE", transport);
    }

    @BeforeEach
    void setup() {
        // Base context configuration - always needed
        when(cifsContext.getConfig()).thenReturn(configuration);

# Classes as Dependencies { #classes-as-dependencies }

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

{* ../../docs_src/app_testing/test_main.py hl[3] *}


...and have the code for the tests just like before.

## Testing: extended example { #testing-extended-example }

Now let's extend this example and add more details to see how to test different parts.

### Extended **FastAPI** app file { #extended-fastapi-app-file }

Let's continue with the same file structure as before: