import org.codelibs.fess.crawler.helper.ContentLengthHelper;
import org.codelibs.fess.crawler.helper.EncodingHelper;
import org.codelibs.fess.crawler.helper.MemoryDataHelper;
import org.codelibs.fess.crawler.helper.RobotsTxtHelper;
import org.codelibs.fess.crawler.helper.SitemapsHelper;
import org.codelibs.fess.crawler.helper.UrlConvertHelper;
import org.codelibs.fess.crawler.helper.impl.LogHelperImpl;

    )
    assert response.headers["access-control-allow-headers"] == "X-Example"

    # Test standard response
    headers = {"Origin": "https://localhost.tiangolo.com"}
    response = client.get("/", headers=headers)
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Hello World"}
    assert (
        response.headers["access-control-allow-origin"]

  @Test fun basicChallenge() {
    val headers =
      Headers
        .Builder()
        .add("WWW-Authenticate: Basic realm=\"protected area\"")
        .build()
    assertThat(headers.parseChallenges("WWW-Authenticate"))
      .isEqualTo(listOf(Challenge("Basic", mapOf("realm" to "protected area"))))
  }

  @Test fun basicChallengeWithCharset() {
    val headers =
      Headers
        .Builder()

  integrity sha512-z3nFzdcp1mb8nEOFFk8DrYLpHvhKC3grJD2ardfKOzmbmJvEf/tPIqCY+sNcwZIY8ZD7IkB2l7/pqhUhqm7hLA==

"@webassemblyjs/helper-numbers@1.11.6":
  version "1.11.6"
  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-numbers/-/helper-numbers-1.11.6.tgz#cbce5e7e0c1bd32cf4905ae444ef64cea919f1b5"

    assertThat(connect.headers["Private"]).isNull()
    assertThat(connect.headers["User-Agent"]).isEqualTo(USER_AGENT)
    assertThat(connect.headers["Proxy-Connection"]).isEqualTo("Keep-Alive")
    assertThat(connect.headers["Host"]).isEqualTo("android.com:443")
    val get = server.takeRequest()
    assertThat(get.headers["Private"]).isEqualTo("Secret")
    assertThat(get.headers["User-Agent"]).isEqualTo("App 1.0")

    val expected = Date(0L)
    val headers =
      Headers
        .Builder()
        .add("testDate", expected)
        .build()
    assertThat(headers["testDate"]).isEqualTo("Thu, 01 Jan 1970 00:00:00 GMT")
    assertThat(headers.getDate("testDate")).isEqualTo(Date(0L))
  }

  @Test fun addInstant() {
    val expected = Instant.ofEpochMilli(0L)
    val headers =
      Headers
        .Builder()

        }.toString()
    }

    private fun logHeader(
      headers: Headers,
      i: Int,
    ) {
      val value = if (headers.name(i) in headersToRedact) "██" else headers.value(i)
      logger.log(headers.name(i) + ": " + value)
    }

    private fun bodyHasUnknownEncoding(headers: Headers): Boolean {
      val contentEncoding = headers["Content-Encoding"] ?: return false

  private static final AtomicHelper ATOMIC_HELPER;

  private static final LazyLogger log = new LazyLogger(AggregateFutureState.class);

  static {
    AtomicHelper helper;
    Throwable thrownReflectionFailure = null;
    try {
      helper = new SafeAtomicHelper();
    } catch (Throwable reflectionFailure) { // sneaky checked exception
      // Some Android 5.0.x Samsung devices have bugs in JDK reflection APIs that cause

    val headers = headersOf("User-Agent", "RequestTest")
    val request =
      Request(
        url = url,
        headers = headers,
      )
    assertThat(request.url).isEqualTo(url)
    assertThat(request.headers).isEqualTo(headers)
    assertThat(request.method).isEqualTo("GET")
    assertThat(request.body).isNull()
    assertThat(request.tags).isEqualTo(EmptyTags)
  }

  @Test

**FastAPI** will **extract** the data for **each field** from the **headers** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can see the required headers in the docs UI at `/docs`:

<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

## Forbid Extra Headers { #forbid-extra-headers }