FastAPI added support for `Annotated` (and started recommending it) in version 0.95.0.

If you have an older version, you would get errors when trying to use `Annotated`.

Make sure you [Upgrade the FastAPI version](../deployment/versions.md#upgrading-the-fastapi-versions) to at least 0.95.1 before using `Annotated`.

///

## Use `Annotated` in the type for the `q` parameter { #use-annotated-in-the-type-for-the-q-parameter }

            SmbFileInputStream in = newStream();
            assertEquals(0, in.available());
        }

        @Test
        @DisplayName("skip: positive advances; non-positive returns 0")
        void skipBehavior() throws Exception {
            SmbFileInputStream in = newStream();
            assertEquals(0, in.skip(0));
            assertEquals(0, in.skip(-1));
            assertEquals(5, in.skip(5));

<img src="/img/tutorial/generate-clients/image01.png">

You can see those schemas because they were declared with the models in the app.

That information is available in the app's **OpenAPI schema**, and then shown in the API docs.

That same information from the models that is included in OpenAPI is what can be used to **generate the client code**.

    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see
    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one

    util.concurrent tests under Guava.

    The problem is that GWT responds poorly to two .gwt.xml files in the same
    Java package; see
    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one

 * all elements in priority order and place them in another collection.
 *
 * <p>Operations on this class make no guarantees about the ordering of elements with equal
 * priority. If you need to enforce an ordering, you can define custom classes or comparators that
 * use a secondary key to break ties in primary priority values. For example, here is a class that

    assert err.value.errors() == [
        {
            "type": "value_error",
            "loc": ("response", "name"),
            "msg": "Value error, name must end in A",
            "input": "modelX",
            "ctx": {"error": HasRepr("ValueError('name must end in A')")},
        }
    ]


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")

    pr = repo.get_pull(number)
    label_strs = {label.name for label in pr.get_labels()}
    langs = []
    for label in label_strs:
        if label.startswith("lang-") and not label == lang_all_label:
            langs.append(label[5:])
    logging.info(f"PR #{pr.number} has labels: {label_strs}")
    if not langs or lang_all_label not in label_strs:

     * @param failureThreshold number of failures before opening
     * @param successThreshold number of successes in half-open before closing
     * @param resetTimeoutMillis time to wait before attempting reset (ms)
     * @param halfOpenMaxAttempts max attempts in half-open state
     */

      and conversions to other media types.

      "Work" shall mean the work of authorship, whether in Source or
      Object form, made available under the License, as indicated by a
      copyright notice that is included in or attached to the work
      (an example is provided in the Appendix below).

      "Derivative Works" shall mean any work, whether in Source or Object
      form, that is based on (or derived from) the Work and for which the