<div class="termy">

```console
$ pip install "fastapi[standard]"

---> 100%
```

</div>

/// note

When you install with `pip install "fastapi[standard]"` it comes with some default optional standard dependencies.

If you don't want to have those optional dependencies, you can instead install `pip install fastapi`.

///

```JSON
{"item_id":"foo"}
```

## Path parameters with types

You can declare the type of a path parameter in the function, using standard Python type annotations:

```Python hl_lines="7"
{!../../docs_src/path_params/tutorial002.py!}
```

In this case, `item_id` is declared to be an `int`.

/// check

/// note | "Technical Details"

ASGI is a new "standard" being developed by Django core team members. It is still not a "Python standard" (a PEP), although they are in the process of doing that.

          "tokenizer": "standard",
          "filter": [
            "truncate20_filter",
            "lowercase",
            "arabic_stop",
            "arabic_normalization",
            "arabic_keywords",
            "arabic_override",
            "arabic_stemmer"
          ]
        },
        "armenian_analyzer": {
          "tokenizer":  "standard",
          "filter": [

          "tokenizer": "standard",
          "filter": [
            "truncate20_filter",
            "lowercase",
            "arabic_stop",
            "arabic_normalization",
            "arabic_keywords",
            "arabic_override",
            "arabic_stemmer"
          ]
        },
        "armenian_analyzer": {
          "tokenizer":  "standard",
          "filter": [

                                    "title": "Standard Query Param",
                                }
                            )
                            | IsDict(
                                # TODO: remove when deprecating Pydantic v1
                                {
                                    "title": "Standard Query Param",
                                    "type": "integer",

func SetStorageClass(s config.Config, cfg Config) {
	if len(cfg.Standard.String()) == 0 && len(cfg.RRS.String()) == 0 {
		// Do not enable storage-class if no settings found.
		return
	}
	s[config.StorageClassSubSys][config.Default] = config.KVS{
		config.KV{
			Key:   ClassStandard,
			Value: cfg.Standard.String(),
		},
		config.KV{
			Key:   ClassRRS,
			Value: cfg.RRS.String(),
		},
	}

For example, to install Uvicorn:

<div class="termy">

```console
$ pip install "uvicorn[standard]"

---> 100%
```

</div>

A similar process would apply to any other ASGI server program.

/// tip

By adding the `standard`, Uvicorn will install and use some recommended extra dependencies.

/// note | "Technische Details"

ASGI ist ein neuer „Standard“, welcher von Mitgliedern des Django-Kernteams entwickelt wird. Es handelt sich immer noch nicht um einen „Python-Standard“ (ein PEP), obwohl sie gerade dabei sind, das zu tun.

* `bytes`:
    * Standard-Python-`bytes`.
    * In Requests und Responses werden sie als `str` behandelt.
    * Das generierte Schema wird anzeigen, dass es sich um einen `str` mit `binary` „Format“ handelt.
* `Decimal`:
    * Standard-Python-`Decimal`.
    * In Requests und Responses wird es wie ein `float` behandelt.