因此，我们下一步要做的就是添加代码，为从 API 接收回调的*外部 API*存档。

这部分文档在 `/docs` 下的 Swagger API 文档中显示，并且会告诉外部开发者如何构建*外部 API*。

本例没有实现回调本身（只是一行代码），只有文档部分。

/// tip | 提示

实际的回调只是 HTTP 请求。

实现回调时，要使用 <a href="https://www.encode.io/httpx/" class="external-link" target="_blank">HTTPX</a> 或 <a href="https://requests.readthedocs.io/" class="external-link" target="_blank">Requests</a>。

///

## 编写回调文档代码

应用不执行这部分代码，只是用它来*记录 外部 API* 。

	// always emitted. The legacy MS-DOS date field is encoded according to the
	// location of the Modified time.
	Modified time.Time

	// ModifiedTime is an MS-DOS-encoded time.
	//
	// Deprecated: Use Modified instead.
	ModifiedTime uint16

	// ModifiedDate is an MS-DOS-encoded date.
	//
	// Deprecated: Use Modified instead.
	ModifiedDate uint16

Rara vez necesitarás regresar a la documentación.

Aquí está cómo tu editor podría ayudarte:

* en <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a>:

![soporte del editor](https://fastapi.tiangolo.com/img/vscode-completion.png)

* en <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

				writeErrorResponse(ctx, w, errorCodes.ToAPIErr(apiErrCode), r.URL)
				return
			}
			apiErr := errorCodes.ToAPIErr(apiErrCode)
			deleteResults[index].errInfo = DeleteError{
				Code:      apiErr.Code,
				Message:   apiErr.Description,
				Key:       object.ObjectName,
				VersionID: object.VersionID,
			}
			continue
		}
		if object.VersionID != "" && object.VersionID != nullVersionID {

        final File targetDir = new File(userDir, "target");
        return new File(targetDir, "logs").getAbsolutePath();
    }

    /**
     * Encodes a URL path for filtering.
     *
     * @param path The path to encode.
     * @return The encoded path.
     */
    public String encodeUrlFilter(final String path) {
        if (filterPathEncoding == null || path == null) {
            return path;
        }

            final PermissionHelper permissionHelper = ComponentUtil.getPermissionHelper();
            entity.setPermissions(split(form.permissions, "\n").get(
                    stream -> stream.map(permissionHelper::encode).filter(StringUtil::isNotBlank).distinct().toArray(n -> new String[n])));
            return entity;
        });
    }

    /**
     * Registers label type data for rendering in the view.
     *

            return ni != null && ni.supportsMulticast();
        } catch (Exception e) {
            return false;
        }
    }
    
    public byte[] encode() {
        // Encode for FSCTL_QUERY_NETWORK_INTERFACE_INFO response
        byte[] buffer = new byte[152];  // Fixed size structure
        
        // InterfaceIndex (4 bytes)
        writeInt4(buffer, 0, interfaceIndex);

        pairs.add(new AvTimestamp(System.currentTimeMillis()));
        pairs.add(new AvFlags(0));
        pairs.add(new AvSingleHost(new byte[48])); // Dummy single host data

        type2.setTargetInformation(AvPairs.encode(pairs));

        return type2;
    }

    /**
     * Helper method to create a mock context with specific LanMan compatibility level
     */

Você raramente precisará voltar à documentação.

Aqui está como o editor poderá te ajudar:

* no <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a>:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* no <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

		})
	}

	buf := bytebufferpool.Get()
	defer bytebufferpool.Put(buf)

	enc := jsoniter.ConfigCompatibleWithStandardLibrary.NewEncoder(buf)
	for i := range items {
		if err = enc.Encode(items[i]); err != nil {
			t.Fatal(err)
		}
	}

	if _, err := store.PutMultiple(items); err != nil {
		t.Fatalf("failed to put multiple; %v", err)
	}

	keys := store.List()
	if len(keys) != 1 {