## 覆寫預設例外處理器 { #override-the-default-exception-handlers }

**FastAPI** 內建了一些預設例外處理器。

這些處理器負責在你 `raise` 一個 `HTTPException` 或請求帶有無效資料時，回傳預設的 JSON 回應。

你可以用自己的處理器來覆寫它們。

### 覆寫請求驗證例外 { #override-request-validation-exceptions }

當請求包含無效資料時，**FastAPI** 會在內部 raise 一個 `RequestValidationError`。

它同時也包含了對應的預設例外處理器。

要覆寫它，匯入 `RequestValidationError`，並用 `@app.exception_handler(RequestValidationError)` 來裝飾你的例外處理器。

See [the dependency injection reference](references/dependencies.md) for detailed patterns including `yield` with `scope`, and class dependencies.

Use dependencies when the logic can't be declared in Pydantic validation, depends on external resources, needs cleanup (with `yield`), or is shared across endpoints.

Apply shared dependencies at the router level via `dependencies=[Depends(...)]`.

## Async vs Sync *path operations*

        try {
            resp = send(req, RequestParam.NO_RETRY);
        } catch (final SMBSignatureValidationException e) {
            throw new SMBProtocolDowngradeException("Signature error during negotiate validation", e);
        } catch (final SmbException e) {
            if (log.isDebugEnabled()) {
                log.debug(String.format("VALIDATE_NEGOTIATE_INFO response code 0x%x", e.getNtStatus()));
            }

import jcifs.ResourceNameFilter;
import jcifs.SmbConstants;
import jcifs.SmbResource;
import jcifs.SmbResourceLocator;

/**
 * Unit tests for NetServerEnumIterator.
 * Tests focus on constructor validation and basic iterator contract.
 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
class NetServerEnumIteratorTest {

    @Mock
    private SmbResourceLocator locator;

* `le`: `l`ess than or `e`qual

/// info

`Query`, `Path`, and other classes you will see later are subclasses of a common `Param` class.

All of them share the same parameters for additional validation and metadata you have seen.

///

/// note | Technical Details

When you import `Query`, `Path` and others from `fastapi`, they are actually functions.

	}

	if policies[0] != "consoleAdmin" {
		t.Fatalf("expected 'consoleAdmin', %s", policies[0])
	}
}

// TestSkipContentSha256Cksum - Test validate the logic which decides whether
// to skip checksum validation based on the request header.
func TestSkipContentSha256Cksum(t *testing.T) {
	testCases := []struct {
		inputHeaderKey   string
		inputHeaderValue string

		inputQueryKey   string
		inputQueryValue string

Використання `str | None` дозволить вашому редактору коду надавати кращу підтримку та виявляти помилки.

///

## Додаткова валідація { #additional-validation }

Ми хочемо, щоб навіть якщо `q` є необов’язковим, коли його передають, його довжина не перевищувала 50 символів.

### Імпорт `Query` та `Annotated` { #import-query-and-annotated }

Щоб це зробити, спочатку імпортуємо:

        }
    }

    @Test
    public void test_throwAndCatchWithCause() {
        // Test throwing and catching exception with cause
        String expectedMessage = "Theme validation failed";
        Exception expectedCause = new IllegalStateException("Invalid state");

        try {
            throw new ThemeException(expectedMessage, expectedCause);
        } catch (ThemeException e) {

        }
    }

    /**
     * Invalidate read cache for a file path
     *
     * @param path file path
     */
    private void invalidateReadCache(String path) {
        log.debug("Invalidating read cache for path: {}", path);

        WeakReference<SmbFile> ref = fileCache.get(path);
        if (ref != null) {
            SmbFile file = ref.get();
            if (file != null) {
                try {

* Editor-Unterstützung (Codevervollständigung, usw.), selbst für verschachtelte Modelle
* Datenkonvertierung
* Datenvalidierung
* Automatische Dokumentation

## Spezielle Typen und Validierungen { #special-types-and-validation }

Abgesehen von normalen einfachen Typen wie `str`, `int`, `float`, usw. können Sie komplexere einfache Typen verwenden, die von `str` erben.