val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    assertThat(headers.toString()).isEqualTo(
      """
      |content-length: 99
      |authorization: ██

If a client tries to send some **extra cookies**, they will receive an **error** response.

Poor cookie banners with all their effort to get your consent for the <abbr title="This is another joke. Don't pay attention to me. Have some coffee for your cookie. ☕">API to reject it</abbr>. 🍪

    val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

    val headers =
      Headers.Builder()
        .add("content-length", "99")
        .add("authorization", "peanutbutter")
        .add("proxy-authorization", "chocolate")
        .add("cookie", "drink=coffee")
        .add("set-cookie", "accessory=sugar")
        .add("user-agent", "OkHttp")
        .build()
    val request =
      Request(
        "https://square.com".toHttpUrl(),
        headers,
      )

## Sponsor the author

You can also financially support the author (me) through <a href="https://github.com/sponsors/tiangolo" class="external-link" target="_blank">GitHub sponsors</a>.

There you could buy me a coffee ☕️ to say thanks. 😄

And you can also become a Silver or Gold sponsor for FastAPI. 🏅🎉

## Sponsor the tools that power FastAPI

club

// clubmed : 2015-06-25 Club Méditerranée S.A.
clubmed

// coach : 2014-10-09 Binky Moon, LLC
coach

// codes : 2013-10-31 Binky Moon, LLC
codes

// coffee : 2013-10-17 Binky Moon, LLC
coffee

// college : 2014-01-16 XYZ.COM LLC
college

// cologne : 2014-02-05 dotKoeln GmbH
cologne

// comcast : 2015-07-23 Comcast IP Holdings I, LLC
comcast

co.place co.pn co.pw co.ro co.rs co.rw co.st co.sz co.technology co.th co.tj co.tm co.tt co.tz co.ua co.ug co.uk co.us co.uz co.ve co.vi co.za co.zm co.zw coach coal.museum coastaldefence.museum cocotte.jp codeberg.page codes codespot.com cody.museum coffee cog.mi.us col.ng coldwar.museum collection.museum college collegefan.org cologne colonialwilliamsburg.museum coloradoplateau.museum columbia.museum columbus.museum com com.ac com.af com.ag com.ai com.al com.am com.ar com.au com.aw com.az com.ba com.bb...

    <glob pattern="*.clj"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-coffeescript">
    <_comment>CoffeeScript source code</_comment>
    <glob pattern="*.coffee"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-csrc">
    <alias type="text/x-c"/>
    <_comment>C source code</_comment>
    <magic priority="30">

  public void testOffer_supportedNotPresent() {
    assertTrue("offer(notPresent) should return true", getQueue().offer(e3()));
    expectAdded(e3());
  }

  @CollectionFeature.Require({SUPPORTS_ADD, ALLOWS_NULL_VALUES})
  public void testOffer_nullSupported() {
    assertTrue("offer(null) should return true", getQueue().offer(null));
    expectAdded((E) null);
  }

    tax: Union[float, None] = None
    tags: set[str] = set()
    images: Union[list[Image], None] = None


class Offer(BaseModel):
    name: str
    description: Union[str, None] = None
    price: float
    items: list[Item]


@app.post("/offers/")
async def create_offer(offer: Offer):