```

#### Wie relative Importe funktionieren

/// tip | "Tipp"

Wenn Sie genau wissen, wie Importe funktionieren, fahren Sie mit dem nächsten Abschnitt unten fort.

///

Ein einzelner Punkt `.`, wie in:

```Python
from .dependencies import get_token_header
```

würde bedeuten:

你可以在 **FastAPI** 应用中使用 `CORSMiddleware` 来配置它。

* 导入 `CORSMiddleware`。
* 创建一个允许的源列表（由字符串组成）。
* 将其作为「中间件」添加到你的 **FastAPI** 应用中。

你也可以指定后端是否允许：

* 凭证（授权 headers，Cookies 等）。
* 特定的 HTTP 方法（`POST`，`PUT`）或者使用通配符 `"*"` 允许所有方法。
* 特定的 HTTP headers 或者使用通配符 `"*"` 允许所有 headers。

```Python hl_lines="2  6-11  13-19"
{!../../docs_src/cors/tutorial001.py!}
```

                line = br.readLine();
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }

        if (!errorsForFile.isEmpty()) {
            errors.put(sourceFile, errorsForFile);
        }
    }

    private void gatherMarkdownLinksInLine(File sourceFile, String line, int lineNumber, List<Error> errorsForFile) {

                            builder.setScript(script);
                            final Map<String, Object> upsertMap = new HashMap<>();
                            upsertMap.put(fessConfig.getIndexFieldFavoriteCount(), 1);
                            builder.setUpsert(upsertMap);
                            builder.setRefreshPolicy(Constants.TRUE);
                        });

        allowedPriorLocks.put(acquiredLock, new ExampleStackTrace(acquiredLock, this));
      } else {
        // Unsafe acquisition order detected. Create and cache a
        // PotentialDeadlockException.
        PotentialDeadlockException exception =
            new PotentialDeadlockException(acquiredLock, this, path);
        disallowedPriorLocks.put(acquiredLock, exception);

  protected void setUp() throws Exception {
    map = new MutableTypeToInstanceMap<>();
  }

  public void testPutThrows() {
    assertThrows(
        UnsupportedOperationException.class,
        () -> map.put(TypeToken.of(Integer.class), Integer.valueOf(5)));
  }

  public void testPutAllThrows() {
    assertThrows(
        UnsupportedOperationException.class,

import org.opensearch.action.admin.indices.mapping.get.GetFieldMappingsResponse.FieldMappingMetadata;
import org.opensearch.action.admin.indices.mapping.get.GetMappingsResponse;
import org.opensearch.action.admin.indices.mapping.put.PutMappingRequestBuilder;
import org.opensearch.action.index.IndexRequest;
import org.opensearch.action.support.master.AcknowledgedResponse;
import org.opensearch.client.Client;
import org.opensearch.client.IndicesAdminClient;

                        @SuppressWarnings("unchecked")
                        final EnumMap<Type, Dictionary> dictionaryMap = (EnumMap<Type, Dictionary>) dictionaryMapField.get(tokenizer);
                        dictionaryMap.put(Type.USER, userDictionary);
                    } catch (final Exception e) {
                        throw new IllegalStateException("Failed to update the tokenizer.", e);
                    }
                }

            this.referent = 1;
        }

        if ( ( e = this.referents.get(obj) ) == null ) {
            e = new Entry(this.referent++, obj);
            this.referents.put(obj, e);
        }

        return e.referent;
    }


    public void enc_ndr_referent ( Object obj, int type ) {
        if ( obj == null ) {
            enc_ndr_long(0);
            return;

* Adicione-a como um "middleware" à sua aplicação **FastAPI**.

Você também pode especificar se o seu backend permite:

* Credenciais (Cabeçalhos de autorização, Cookies, etc).
* Métodos HTTP específicos (`POST`, `PUT`) ou todos eles com o curinga `"*"`.
* Cabeçalhos HTTP específicos ou todos eles com o curinga `"*"`.

```Python hl_lines="2  6-11  13-19"
{!../../docs_src/cors/tutorial001.py!}
```