*/
  public static final MediaType VND_REAL_AUDIO = createConstant(AUDIO_TYPE, "vnd.rn-realaudio");

  /**
   * WAVE format, as defined by <a href="https://tools.ietf.org/html/rfc2361">RFC 2361</a>.
   *
   * @since 20.0
   */
  public static final MediaType VND_WAVE_AUDIO = createConstant(AUDIO_TYPE, "vnd.wave");

  /* video types */
  public static final MediaType MP4_VIDEO = createConstant(VIDEO_TYPE, "mp4");

f10b"}.fa-mobile-alt:before{content:"\f3cd"}.fa-modx:before{content:"\f285"}.fa-monero:before{content:"\f3d0"}.fa-money-bill:before{content:"\f0d6"}.fa-money-bill-alt:before{content:"\f3d1"}.fa-money-bill-wave:before{content:"\f53a"}.fa-money-bill-wave-alt:before{content:"\f53b"}.fa-money-check:before{content:"\f53c"}.fa-money-check-alt:before{content:"\f53d"}.fa-monument:before{content:"\f5a6"}.fa-moon:before{content:"\f186"}.fa-mortar-pestle:before{content:"\f5a7"}.fa-mosque:before{content:"\f...

   */
  public static final MediaType VND_REAL_AUDIO = createConstant(AUDIO_TYPE, "vnd.rn-realaudio");

  /**
   * WAVE format, as defined by <a href="https://tools.ietf.org/html/rfc2361">RFC 2361</a>.
   *
   * @since 20.0
   */
  public static final MediaType VND_WAVE_AUDIO = createConstant(AUDIO_TYPE, "vnd.wave");

  /* video types */
  public static final MediaType MP4_VIDEO = createConstant(VIDEO_TYPE, "mp4");

f10b"}.fa-mobile-alt:before{content:"\f3cd"}.fa-modx:before{content:"\f285"}.fa-monero:before{content:"\f3d0"}.fa-money-bill:before{content:"\f0d6"}.fa-money-bill-alt:before{content:"\f3d1"}.fa-money-bill-wave:before{content:"\f53a"}.fa-money-bill-wave-alt:before{content:"\f53b"}.fa-money-check:before{content:"\f53c"}.fa-money-check-alt:before{content:"\f53d"}.fa-monument:before{content:"\f5a6"}.fa-moon:before{content:"\f186"}.fa-mortar-pestle:before{content:"\f5a7"}.fa-mosque:before{content:"\f...

.placeholder{animation:placeholder-glow 2s ease-in-out infinite}@keyframes placeholder-glow{50%{opacity:.2}}.placeholder-wave{-webkit-mask-image:linear-gradient(130deg,#000 55%,rgba(0,0,0,0.8) 75%,#000 95%);mask-image:linear-gradient(130deg,#000 55%,rgba(0,0,0,0.8) 75%,#000 95%);-webkit-mask-size:200% 100%;mask-size:200% 100%;animation:placeholder-wave 2s linear infinite}@keyframes placeholder-wave{100%{-webkit-mask-position:-200% 0%;mask-position:-200% 0%}}.clearfix::after{display:block;clear:both;content...

BN,kBACE,QAAA,EAEA,WAAA,yBAAA,yBAAA,4BAAA,2BAAA,2BCHF,WACE,QAAA,YACA,IAAA,QACA,YAAA,OACA,8BAAA,0DAAA,sBAAA,0DACA,sBAAA,OACA,4BAAA,OAAA,oBAAA,OAEA,eACE,YAAA,EACA,MAAA,IACA,OAAA,IACA,KAAA,axCIE,WAAA,IAAA,YAAA,UAIA,uCwCZJ,exCaM,WAAA,MwCDJ,mCAAA,2BACE,UAAA,qDCnBN,OACE,SAAA,SACA,MAAA,KAEA,eACE,QAAA,MACA,YAAA,uBACA,QAAA,GAGF,SACE,SAAA,SACA,IAAA,EACA,KAAA,EACA,MAAA,KACA,OAAA,KAKF,WACE,kBAAA,KADF,WACE,kBAAA,IADF,YACE,kBAAA,OADF,YACE,kBAAA,eCrBJ,WACE,SAAA,MACA,IAAA,EACA,MAAA,EACA,KAAA,EACA,QAAA,KAGF,cACE...

```JSON
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    },
    "user": {
        "username": "dave",
        "full_name": "Dave Grohl"
    }
}
```

/// note

Notice that even though the `item` was declared the same way as before, it is now expected to be inside of the body with a key `item`.

///

```console
// You could create an env var MY_NAME with
$ export MY_NAME="Wade Wilson"

// Then you could use it with other programs, like
$ echo "Hello $MY_NAME"

Hello Wade Wilson
```

</div>

////

//// tab | Windows PowerShell

<div class="termy">

```console
// Create an env var MY_NAME
$ $Env:MY_NAME = "Wade Wilson"

// Use it with other programs, like
$ echo "Hello $Env:MY_NAME"

If one of your dependencies is declared multiple times for the same *path operation*, for example, multiple dependencies have a common sub-dependency, **FastAPI** will know to call that sub-dependency only once per request.

```

## Disable Convert Underscores { #disable-convert-underscores }

The same way as with regular header parameters, when you have underscore characters in the parameter names, they are **automatically converted to hyphens**.

For example, if you have a header parameter `save_data` in the code, the expected HTTP header will be `save-data`, and it will show up like that in the docs.