opt raise
        dep -->> handler: Raise HTTPException
        handler -->> client: HTTP error response
        dep -->> dep: Raise other exception
    end
    dep ->> operation: Run dependency, e.g. DB session
    opt raise
        operation -->> dep: Raise HTTPException
        dep -->> handler: Auto forward exception
        handler -->> client: HTTP error response

        }
    }

    // Simple collaborator to demonstrate interaction verification with Mockito
    interface Handler {
        void handle(int code, String message);
    }

    @Mock
    Handler handler;

    @Test
    @DisplayName("Interaction: handler called with each code/message pair")
    void interaction_with_mock_handler_is_as_expected() {

participant client as Client
participant handler as Exception handler
participant dep as Dep with yield
participant operation as Path Operation
participant tasks as Background tasks

    Note over client,operation: Can raise exceptions, including HTTPException
    client ->> dep: Start request
    Note over dep: Run code up to yield
    opt raise Exception
        dep -->> handler: Raise Exception

			t.Fatalf("Test %d: Failed to create HTTP request for GetBucketPolicyHandler: <ERROR> %v", i+1, err)
		}
		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic of the handler.
		// Call the ServeHTTP to execute the handler, GetBucketPolicyHandler handles the request.
		apiRouter.ServeHTTP(recV4, reqV4)
		// Assert the response code with the expected status.
		if recV4.Code != testCase.expectedRespStatus {

In this case, the `startup` event handler function will initialize the items "database" (just a `dict`) with some values.

You can add more than one event handler function.

And your application won't start receiving requests until all the `startup` event handlers have completed.

### `shutdown` event { #shutdown-event }

    static void setupURLHandler() {
        // Register the SMB URL handler to avoid MalformedURLException
        String pkgs = System.getProperty("java.protocol.handler.pkgs");
        if (pkgs == null) {
            System.setProperty("java.protocol.handler.pkgs", "jcifs");
        } else if (!pkgs.contains("jcifs")) {
            System.setProperty("java.protocol.handler.pkgs", pkgs + "|jcifs");
        }
    }

    @BeforeEach

pkg log/slog, func NewMultiHandler(...Handler) *MultiHandler #65954
pkg log/slog, method (*MultiHandler) Enabled(context.Context, Level) bool #65954
pkg log/slog, method (*MultiHandler) Handle(context.Context, Record) error #65954
pkg log/slog, method (*MultiHandler) WithAttrs([]Attr) Handler #65954
pkg log/slog, method (*MultiHandler) WithGroup(string) Handler #65954

    CIFSContext mockCtx;

    @Mock
    Configuration mockCfg;

    // Provides a fresh handler instance for tests
    private Handler newHandler() {
        return new Handler();
    }

    // Provides a handler wired with a mocked CIFSContext
    private Handler newHandlerWith(CIFSContext ctx) {
        return new Handler(ctx);
    }

    @Test
    @DisplayName("getDefaultPort returns SMB default port")

     * @param handler the handler to process resources (must not be {@literal null})
     */
    public static void forEach(final File rootDir, final ResourceHandler handler) {
        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**

///

## Override the default exception handlers { #override-the-default-exception-handlers }

**FastAPI** has some default exception handlers.

These handlers are in charge of returning the default JSON responses when you `raise` an `HTTPException` and when the request has invalid data.

You can override these exception handlers with your own.