---

We just scratched the surface, but you already get the idea of how it all works.

Try changing the line with:

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...from:

```Python
        ... "item_name": item.name ...
```

...to:

```Python
        ... "item_price": item.price ...
```

    * 檢查是否有必填屬性 `name`，且為 `str`。
    * 檢查是否有必填屬性 `price`，且為 `float`。
    * 檢查是否有可選屬性 `is_offer`，若存在則應為 `bool`。
    * 以上也適用於深度巢狀的 JSON 物件。
* 自動在 JSON 與 Python 之間轉換。
* 以 OpenAPI 記錄所有內容，可用於：
    * 互動式文件系統。
    * 為多種語言自動產生用戶端程式碼的系統。
* 直接提供兩種互動式文件網頁介面。

---

我們只觸及了表面，但你已經了解它的運作方式了。

試著把這一行：

```Python
    return {"item_name": item.name, "item_id": item_id}
```

…從：

     * Gets the request timeout in milliseconds.
     *
     * @return the timeout in milliseconds
     */
    protected abstract int getTimeout();

    /**
     * Gets the model name.
     *
     * @return the model name
     */
    protected abstract String getModel();

    /**
     * Gets the availability check interval in seconds.
     *
     * @return the interval in seconds
     */

            int read;
            while ((read = input.read(buf)) >= 0) {
                out.write(buf, 0, read);
            }
            return out.toString(StandardCharsets.UTF_8.name());
        }
    }

    assertThat(cache.hitCount()).isEqualTo(0)
  }

  private fun corruptMetadata(corruptor: (String) -> String) {
    val metadataFile =
      fileSystem.allPaths.find {
        it.name.endsWith(".0")
      }

    if (metadataFile != null) {
      val contents =
        fileSystem.read(metadataFile) {
          readUtf8()
        }

      fileSystem.write(metadataFile) {

     *
     * @return the isEndOfSearch
     */
    public final boolean isEndOfSearch() {
        return this.isEndOfSearch;
    }

    /**
     * Gets the last file name in the response.
     *
     * @return the lastName
     */
    public final String getLastName() {
        return this.lastName;
    }

    /**
     * Gets the resume key for continuing the search.
     *

/// note

If you already know what HTTP status codes are, skip to the next section.

///

In HTTP, you send a numeric status code of 3 digits as part of the response.

These status codes have a name associated to recognize them, but the important part is the number.

In short:

* `100 - 199` are for "Information". You rarely use them directly.  Responses with these status codes cannot have a body.

 *
 */
public class UserAgentHelper {

    /**
     * Default constructor for UserAgentHelper.
     */
    public UserAgentHelper() {
        // Default constructor
    }

    /** The HTTP header name for User-Agent */
    protected static final String USER_AGENT = "user-agent";

    /** The request attribute key for storing cached user agent type */
    protected static final String USER_AGENT_TYPE = "ViewHelper.UserAgent";

    private static final String LIST_ENDPOINT_SUFFIX = "settings";
    private static final String ITEM_ENDPOINT_SUFFIX = "setting";

    private static final String KEY_PROPERTY = "name";

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override

    adapter.configureTlsExtensions(sslSocket, null, listOf(HTTP_2, HTTP_1_1))
    // not connected
    assertNull(adapter.getSelectedProtocol(sslSocket))
  }

  companion object {
    @JvmStatic
    @Parameters(name = "{0}")
    fun data(): Collection<SocketAdapter> =
      listOfNotNull(
        DeferredSocketAdapter(ConscryptSocketAdapter.factory),
        DeferredSocketAdapter(AndroidSocketAdapter.factory("org.conscrypt")),