You can define background tasks to be run *after* returning a response.

This is useful for operations that need to happen after a request, but that the client doesn't really have to be waiting for the operation to complete before receiving the response.

This includes, for example:

* Email notifications sent after performing an action:

<img src="/img/tutorial/security/image12.png">

## Verifique o usuário

Aqui está um exemplo mais completo.

Utilize uma dependência para verificar se o usuário e a senha estão corretos.

* **Daha az xəta**: İnsan (developer) tərəfindən törədilən səhvlərin təxminən 40% -ni azaldın. *
* **İntuitiv**: Əla redaktor dəstəyi. Hər yerdə <abbr title="auto-complete, autocompletion, IntelliSense olaraq da bilinir">otomatik tamamlama</abbr>. Xətaları müəyyənləşdirməyə daha az vaxt sərf edəcəksiniz.

     * <ul>
     *   <li>Changes to the POM file during the build are detected</li>
     *   <li>Cache entries don't persist beyond the current build request</li>
     *   <li>Memory is freed once the build request completes</li>
     * </ul>
     */
    static class BuildPathSource extends PathSource implements ModelSource, CacheMetadata {

        /**
         * Constructs a new ModelPathSource.
         *

        ).hostnameVerifier(RecordingHostnameVerifier())
        .build()
    server.useHttps(handshakeCertificates.sslSocketFactory())
  }

  /** A request body that slowly trickles bytes, expecting to not complete. */
  private object SlowRequestBody : RequestBody() {
    override fun contentType(): MediaType? = null

    override fun writeTo(sink: BufferedSink) {
      for (i in 0 until 50) {
        sink.writeUtf8("abc")

        }
    }

    @Nested
    @DisplayName("Integration tests")
    class IntegrationTests {

        @Test
        @DisplayName("Should handle complete read-write cycle")
        void testCompleteReadWriteCycle() throws SMBProtocolDecodingException {
            // Given
            byte[] writeBuffer = new byte[100];
            byte[] readBuffer = new byte[100];

<font color="#4E9A06">INFO</font>:     Started server process [<font color="#06989A">2265873</font>]
<font color="#4E9A06">INFO</font>:     Waiting for application startup.
<font color="#4E9A06">INFO</font>:     Application startup complete.
```

</div>

`fastapi` 命令列程式就是 **FastAPI CLI**。

FastAPI CLI 接收你的 Python 程式路徑（例如 `main.py`），並自動檢測 FastAPI 實例（通常命名為 `app`），確定正確的引入模組流程，然後運行該應用程式。

在生產環境，你應該使用 `fastapi run` 命令。 🚀

    /**
     * Initializes the query field configuration by loading field mappings from FessConfig.
     * This method is called after dependency injection is complete.
     * It sets up response fields, search fields, facet fields, sort fields, and other
     * field configurations based on the application configuration.
     */
    @PostConstruct
    public void init() {

        assertEquals(0x5678, response.getCapabilities());
        assertEquals(0x9ABC, response.getMaximalAccess());
    }

    @Test
    @DisplayName("Should verify complete protocol compliance")
    void testProtocolCompliance() throws SMBProtocolDecodingException {
        // Given - exact SMB2 TREE_CONNECT response structure

     * present help to user.
     *
     * @return the command string
     */
    @Nonnull
    String command();

    /**
     * Returns the Maven command name (ie "Maven"). This string is used in some invokers to complete error messages.
     *
     * @return the command (human) name
     */
    @Nonnull
    String commandName();

    /**
     * Returns the logger to be used during the parsing process.
     *