// 404
            throw responseManager.new404("Thumbnail for " + form.docId + " is not found.");
        }

        final File thumbnailFile = thumbnailManager.getThumbnailFile(doc);
        if (thumbnailFile == null) {
            if (fessConfig.isThumbnailEnabled()) {
                thumbnailManager.offer(doc);
            }
            // 404

package org.codelibs.fess.app.web.error;

import org.codelibs.fess.app.web.base.FessSearchAction;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.HtmlResponse;

/**
 * Action class for handling HTTP 404 Not Found error pages.
 * This action displays error pages when the requested resource
 * cannot be found on the server.
 */
public class ErrorNotfoundAction extends FessSearchAction {

    /**

public class WebApiExceptionTest extends UnitFessTestCase {

    public void test_constructor_withStatusCodeAndMessage() {
        // Test constructor with status code and message
        int statusCode = 404;
        String message = "Resource not found";

        WebApiException exception = new WebApiException(statusCode, message);

        assertEquals(statusCode, exception.getStatusCode());

The status codes in the 400 range mean that there was an error from the client.

Remember all those **"404 Not Found"** errors (and jokes)?

## Use `HTTPException` { #use-httpexception }

To return HTTP responses with errors to the client you use `HTTPException`.

### Import `HTTPException` { #import-httpexception }

**FastAPI** will take that model, generate its JSON Schema and include it in the correct place in OpenAPI.

For example, to declare another response with a status code `404` and a Pydantic model `Message`, you can write:

{* ../../docs_src/additional_responses/tutorial001.py hl[18,22] *}

/// note

Keep in mind that you have to return the `JSONResponse` directly.

///

/// info

        }

        try (final ResponseData responseData = smbClient.doGet(baseUrl + "none")) {
            assertEquals(0, responseData.getStatus());
            assertEquals(404, responseData.getHttpStatusCode());
            assertEquals(0, responseData.getContentLength());
            assertNull(responseData.getResponseBody());
            assertEquals(baseUrl + "none", responseData.getUrl());

///

## Response Status Code { #response-status-code }

You can define the (HTTP) `status_code` to be used in the response of your *path operation*.

You can pass directly the `int` code, like `404`.

But if you don't remember what each number code is for, you can use the shortcut constants in `status`:

{* ../../docs_src/path_operation_configuration/tutorial001_py310.py hl[1,15] *}

    }

    @Test
    @DisplayName("Test status getter and setter")
    void testStatusGetterSetter() {
        assertEquals(0, response.getStatus());
        response.setStatus(404);
        assertEquals(404, response.getStatus());
    }

    @Test
    @DisplayName("Test numEntries getter and setter")
    void testNumEntriesGetterSetter() {
        assertEquals(0, response.getNumEntries());

* **`400 - 499`** are for "Client error" responses. These are the second type you would probably use the most.
    * An example is `404`, for a "Not Found" response.
    * For generic errors from the client, you can just use `400`.

                .body("{\\\"info\\\":{\\\"name\":\"Lucas Albuquerque\",\"age\":\"21\",\"gender\":\"male\"}}")
                .build();
        }
        return new MockResponse.Builder()
            .code(404)
            .build();
    }
};
server.setDispatcher(dispatcher);
```

### Kotlin
```kotlin
val dispatcher = object : Dispatcher() {