如果有任何后台任务（会在[后台任务](background-tasks.md)一节中介绍，你稍后会看到），它们会在所有中间件之后运行。

///

## 创建中间件 { #create-a-middleware }

要创建中间件，你可以在函数的顶部使用装饰器 `@app.middleware("http")`。

中间件函数会接收：

* `request`。
* 一个函数 `call_next`，它会把 `request` 作为参数接收。
    * 这个函数会把 `request` 传递给相应的*路径操作*。
    * 然后它返回由相应*路径操作*生成的 `response`。
* 在返回之前，你可以进一步修改 `response`。

{* ../../docs_src/middleware/tutorial001_py310.py hl[8:9,11,14] *}

/// tip

     * block is automatically generated from the ntstatus package.
     */

    /** The operation completed successfully */
    int NT_STATUS_SUCCESS = 0x00000000;
    /** The request is pending */
    int NT_STATUS_PENDING = 0x00000103;
    /** A notify change request is being completed and information is being returned */
    int NT_STATUS_NOTIFY_ENUM_DIR = 0x0000010C;
    /** The data was too large to fit into the specified buffer */

  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_notPresent() {
    assertNull("remove(notPresent) should return null", getMap().remove(k3()));
    expectUnchanged();
  }

  @MapFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_KEYS})
  @CollectionSize.Require(absent = ZERO)
  public void testRemove_nullPresent() {
    initMapWithNullKey();

    int initialSize = getMap().size();
    assertEquals(

        RequestWithFileId request = new Smb2CloseRequest(mockConfig, emptyFileId);

        // All sizes should be accepted without exception
        assertDoesNotThrow(() -> request.setFileId(shortFileId), "Should handle 8-byte file ID");
        assertDoesNotThrow(() -> request.setFileId(standardFileId), "Should handle 16-byte file ID");
        assertDoesNotThrow(() -> request.setFileId(longFileId), "Should handle 32-byte file ID");

import org.codelibs.fess.app.web.api.admin.BaseSearchBody;

/**
 * Search request body for request header administration API.
 */
public class SearchBody extends BaseSearchBody {

    /**
     * Default constructor.
     */
    public SearchBody() {
        super();
    }

    /** Request header configuration ID */
    public String id;

         * direct dependencies from the request will be merged with the direct dependencies from the root dependency's
         * artifact descriptor, giving higher priority to the dependencies from the request.
         *
         * @param dependencies the direct dependencies, may be {@code null}
         * @return this request for chaining, never {@code null}
         */

		t.Helper()
		if err != nil {
			t.Fatal(err)
		}
	}
	wrapServer := func(handler http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			t.Logf("Got a %s request for: %v", r.Method, r.URL)
			handler.ServeHTTP(w, r)
		})
	}
	connReady := make(chan struct{})
	// We fake a local and remote server.
	localHost := hosts[0]
	remoteHost := hosts[1]

        // search

    }

    /**
     * Get the permissions.
     * @param request The request.
     * @return The permissions.
     */
    public OptionalEntity<Set<String>> getPermissions(final HttpServletRequest request) {
        final String token = ComponentUtil.getAccessTokenHelper().getAccessTokenFromRequest(request);
        if (StringUtil.isNotBlank(token)) {
            return accessTokenBhv.selectEntity(cb -> {

Para criar um middleware, use o decorador `@app.middleware("http")` logo acima de uma função.

A função middleware recebe:

* A `request`.
* Uma função `call_next` que receberá o `request` como um parâmetro.
    * Esta função passará a `request` para a *operação de rota* correspondente.
    * Então ela retorna a `response` gerada pela *operação de rota* correspondente.

        "c6",
      ),
    )
  }

  @Test
  fun getHasCorrectResponse() {
    val request = Request(server.url("/abc"))

    val response = testBasicCachingRules(request)

    assertThat(response.request.url).isEqualTo(request.url)
    assertThat(response.cacheResponse!!.request.url).isEqualTo(request.url)
  }

  @Test
  fun postWithOverrideResponse() {