assertThat(Ascii.truncate("foobar", 10, "...")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 5, "...")).isEqualTo("fo...");
    assertThat(Ascii.truncate("foobar", 6, "...")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 3, "...")).isEqualTo("...");
    assertThat(Ascii.truncate("foobar", 10, "…")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 4, "…")).isEqualTo("foo…");

    assertThat(Ascii.truncate("foobar", 10, "...")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 5, "...")).isEqualTo("fo...");
    assertThat(Ascii.truncate("foobar", 6, "...")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 3, "...")).isEqualTo("...");
    assertThat(Ascii.truncate("foobar", 10, "…")).isEqualTo("foobar");
    assertThat(Ascii.truncate("foobar", 4, "…")).isEqualTo("foo…");

client = TestClient(app)


def test_security_http_base():
    response = client.get("/users/me", headers={"Authorization": "Other foobar"})
    assert response.status_code == 200, response.text
    assert response.json() == {"scheme": "Other", "credentials": "foobar"}


def test_security_http_base_no_credentials():
    response = client.get("/users/me")
    assert response.status_code == 200, response.text

client = TestClient(app)


def test_security_http_digest():
    response = client.get("/users/me", headers={"Authorization": "Digest foobar"})
    assert response.status_code == 200, response.text
    assert response.json() == {"scheme": "Digest", "credentials": "foobar"}


def test_security_http_digest_no_credentials():
    response = client.get("/users/me")
    assert response.status_code == 200, response.text

    assertChecksum(CRC_32, "");
    assertChecksum(CRC_32, "Z");
    assertChecksum(CRC_32, "foobar");
  }

  public void testAdler32_equalsChecksumValue() throws Exception {
    assertChecksum(ADLER_32, "");
    assertChecksum(ADLER_32, "Z");
    assertChecksum(ADLER_32, "foobar");
  }

  public void testCrc32_knownValues() throws Exception {
    assertHash32(0x1C8600E3, CRC_32, "hell");

client = TestClient(app)


def test_security_http_bearer():
    response = client.get("/users/me", headers={"Authorization": "Bearer foobar"})
    assert response.status_code == 200, response.text
    assert response.json() == {"scheme": "Bearer", "credentials": "foobar"}


def test_security_http_bearer_no_credentials():
    response = client.get("/users/me")
    assert response.status_code == 200, response.text

    assertChecksum(CRC_32, "");
    assertChecksum(CRC_32, "Z");
    assertChecksum(CRC_32, "foobar");
  }

  public void testAdler32_equalsChecksumValue() throws Exception {
    assertChecksum(ADLER_32, "");
    assertChecksum(ADLER_32, "Z");
    assertChecksum(ADLER_32, "foobar");
  }

  public void testCrc32_knownValues() throws Exception {
    assertHash32(0x1C8600E3, CRC_32, "hell");

    * So, to authenticate with our API, it sends a header `Authorization` with a value of `Bearer ` plus the token.
    * If the token contains `foobar`, the content of the `Authorization` header would be: `Bearer foobar`.

## **FastAPI**'s `OAuth2PasswordBearer` { #fastapis-oauth2passwordbearer }

**FastAPI** provides several tools, at different levels of abstraction, to implement these security features.

* frontend는 API에서 더 많은 데이터를 가져와야 합니다.
    * 하지만 그 특정 endpoint에는 인증이 필요합니다.
    * 그래서 우리 API에 인증하기 위해 `Authorization` 헤더를, 값은 `Bearer `에 token을 더한 형태로 보냅니다.
    * token에 `foobar`가 들어 있다면 `Authorization` 헤더의 내용은 `Bearer foobar`가 됩니다.

## **FastAPI**의 `OAuth2PasswordBearer` { #fastapis-oauth2passwordbearer }

**FastAPI**는 이런 보안 기능을 구현하기 위해, 서로 다른 추상화 수준에서 여러 도구를 제공합니다.

 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
public class MessageDigestHashFunctionTest extends TestCase {
  private static final ImmutableSet<String> INPUTS = ImmutableSet.of("", "Z", "foobar");

  // From "How Provider Implementations Are Requested and Supplied" from