app = FastAPI()


@app.get("/valid1", responses={"500": {"model": int}})
def valid1():
    pass


@app.get("/valid2", responses={"500": {"model": List[int]}})
def valid2():
    pass


@app.get("/valid3", responses={"500": {"model": Model}})
def valid3():
    pass


@app.get("/valid4", responses={"500": {"model": List[Model]}})
def valid4():
    pass


client = TestClient(app)

		}
		return bindDN, nil
	}

	// Since the username parses as a valid DN, check that it exists and is
	// under a configured base DN in the LDAP directory.
	validDN, isUnderBaseDN, err := l.GetValidatedUserDN(conn, username)
	if err == nil && !isUnderBaseDN {
		return "", fmt.Errorf("Unable to find user DN: %w", err)
	}
	return validDN, err
}

* Valide les **structures complexes**:
    * Utilise les modèles hiérarchique de Pydantic, le `typage` Python pour les `Lists`, `Dict`, etc.
    * Et les validateurs permettent aux schémas de données complexes d'être clairement et facilement définis, validés et documentés sous forme d'un schéma JSON.

```Python
q: Union[str, None] = Query(default=None, max_length=50)
```

Cela va valider les données, montrer une erreur claire si ces dernières ne sont pas valides, et documenter le paramètre dans le schéma `OpenAPI` de cette *path operation*.

## Rajouter plus de validation

Vous pouvez aussi rajouter un second paramètre `min_length` :

				break
			}
		}
		if !found {
			logger.Fatal(fmt.Errorf("unknown algorithm %q passed to --sftp=%s\nValid algorithms: %v", algo, arg, strings.Join(allowed, ", ")), "unable to start SFTP server")
		}
	}
	if len(filteredAlgos) == 0 {
		logger.Fatal(fmt.Errorf("no valid algorithms passed to --sftp=%s\nValid algorithms: %v", arg, strings.Join(allowed, ", ")), "unable to start SFTP server")
	}
	return filteredAlgos
}

#
0000..002C    ; disallowed_STD3_valid                  # 1.1  <control-0000>..COMMA
002D..002E    ; valid                                  # 1.1  HYPHEN-MINUS..FULL STOP
002F          ; disallowed_STD3_valid                  # 1.1  SOLIDUS
0030..0039    ; valid                                  # 1.1  DIGIT ZERO..DIGIT NINE
003A..0040    ; disallowed_STD3_valid                  # 1.1  COLON..COMMERCIAL AT

			valid: false,
		},
		{
			name:  "port name missing service",
			in:    portNameMissingSvc,
			valid: false,
		},
		{
			name:  "version label missing deployment",
			in:    versionLabelMissingDeployment,
			valid: true,
		},
		{
			name:  "valid port naming service",
			in:    validPortNamingSvc,
			valid: true,
		},
		{
			name:  "valid port naming with suffix service",

				strings.Join([]string{
					// generating a valid credential.
					generateCredentialStr(
						"access key",
						sampleTimeStr,
						"us-west-1",
						"s3",
						"aws4_request"),
					// valid SignedHeader.
					"SignedHeaders=host;x-amz-content-sha256;x-amz-date",
					// valid Signature field.
					// a valid signature is of form "Signature="
					"Signature=abcd",
				}, ","),

    @Override
    public ListenableFuture<String> apply(Integer input) throws Exception {
      switch (input) {
        case VALID_INPUT_DATA:
          outputFuture.set(RESULT_DATA);
          break;
        case SLOW_OUTPUT_VALID_INPUT_DATA:
          break; // do nothing to the result
        case SLOW_FUNC_VALID_INPUT_DATA:
          funcIsWaitingLatch.countDown();
          awaitUninterruptibly(funcCompletionLatch);
          break;

          Mapping(0x0233, 0x0233, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x0234, 0x0236, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x0237, 0x0239, TYPE_VALID, ByteString.EMPTY),
          Mapping(0x023a, 0x023a, TYPE_MAPPED, "b".encodeUtf8()),
        ),
      ),
    ).containsExactly(
      Mapping(0x0232, 0x0232, TYPE_MAPPED, "a".encodeUtf8()),
      Mapping(0x0233, 0x0239, TYPE_VALID, ByteString.EMPTY),