"af", "for", "ikke", "der", "var", "mig", "sig", "men", "et", "har", "om", "vi", "min", "havde", "ham", "hun", "nu", "over", "da", "fra", "du", "ud", "sin", "dem", "os", "op", "man", "hans", "hvor", "eller", "hvad", "skal", "selv", "her", "alle", "vil", "blev", "kunne", "ind", "når", "være", "dog", "noget", "ville", "jo", "deres", "efter", "ned", "skulle", "denne", "end", "dette", "mit", "også", "under", "have", "dig", "anden", "hende", "mine", "alt", "meget", "sit", "sine", "vor", "mod", "disse",...

"af", "for", "ikke", "der", "var", "mig", "sig", "men", "et", "har", "om", "vi", "min", "havde", "ham", "hun", "nu", "over", "da", "fra", "du", "ud", "sin", "dem", "os", "op", "man", "hans", "hvor", "eller", "hvad", "skal", "selv", "her", "alle", "vil", "blev", "kunne", "ind", "når", "være", "dog", "noget", "ville", "jo", "deres", "efter", "ned", "skulle", "denne", "end", "dette", "mit", "også", "under", "have", "dig", "anden", "hende", "mine", "alt", "meget", "sit", "sine", "vor", "mod", "disse",...

/// tip

Notice the autocompletion for `name` and `price`, that was defined in the FastAPI application, in the `Item` model.

///

You will have inline errors for the data that you send:

<img src="/img/tutorial/generate-clients/image04.png">

The response object will also have autocompletion:

<img src="/img/tutorial/generate-clients/image05.png">

## FastAPI App with Tags { #fastapi-app-with-tags }

In fact, in some cases, it will even have **two JSON Schemas** in OpenAPI for the same Pydantic model, for input and output, depending on if they have **default values**.

Let's see how that works and how to change it if you need to do that.

## Pydantic Models for Input and Output { #pydantic-models-for-input-and-output }

Let's say you have a Pydantic model with default values, like this one:

But `OAuth2PasswordRequestForm` is just a class dependency that you could have written yourself, or you could have declared `Form` parameters directly.

But as it's a common use case, it is provided by **FastAPI** directly, just to make it easier.

///

### Use the form data { #use-the-form-data }

/// tip

        // Create next index
        suggester.createNextIndex();

        // Verify we now have two indices
        GetIndexResponse response = runner.admin().indices().prepareGetIndex().addIndices(getIndexName() + "*").execute().actionGet();
        assertEquals("Should have two indices", 2, response.getIndices().length);
    }

    @Test
    public void test_switchIndex_works() throws Exception {

    * A special case is `204`, "No Content".  This response is used when there is no content to return to the client, and so the response must not have a body.
* **`300 - 399`** are for "Redirection".  Responses with these status codes may or may not have a body, except for `304`, "Not Modified", which must not have one.
* **`400 - 499`** are for "Client error" responses. These are the second type you would probably use the most.

Do you want to have an `id` and `email` and not have any `username` in your model? Sure. You can use these same tools.

Do you want to just have a `str`? Or just a `dict`? Or a database class model instance directly? It all works the same way.

You actually don't have users that log in to your application but robots, bots, or other systems, that have just an access token? Again, it all works the same.

In this case, it would be better to get **one extra server** and run some processes on it so that they all have **enough RAM and CPU time**.

There's also the chance that for some reason you have a **spike** of usage of your API. Maybe it went viral, or maybe some other services or bots start using it. And you might want to have extra resources to be safe in those cases.

Now, from a **developer's perspective**, here are several things to keep in mind while thinking about HTTPS:

* For HTTPS, **the server** needs to **have "certificates"** generated by a **third party**.
    * Those certificates are actually **acquired** from the third party, not "generated".
* Certificates have a **lifetime**.
    * They **expire**.
    * And then they need to be **renewed**, **acquired again** from the third party.