Se houver alguma tarefa em segundo plano (documentada posteriormente), ela será executada *depois* de todo o middleware.

///

## Criar um middleware

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.

   * context class loader will find resources from the class path. In environments where different
   * threads can have different class loaders, for example app servers, the context class loader
   * will typically have been set to an appropriate loader for the current thread.
   *
   * <p>In the unusual case where the context class loader is null, the class loader that loaded

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.service;

import static org.codelibs.core.stream.StreamUtil.split;
import static org.codelibs.core.stream.StreamUtil.stream;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

```Python
results = await some_library()
```

O zaman *path operasyon fonksiyonunu* `async def` ile tanımlayın örneğin:

```Python hl_lines="2"
@app.get('/')
async def read_results():
    results = await some_library()
    return results
```

/// note | Not

Sadece `async def` ile tanımlanan fonksiyonlar içinde `await` kullanabilirsiniz.

///

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.pager;

import java.io.Serializable;
import java.util.List;

import org.codelibs.fess.util.ComponentUtil;

/**
 * Pager for managing synonym pagination.

    @Resource
    private FesenClient fesenClient;

    private OpenSearchRunner runner;

    @Override
    protected String prepareConfigFile() {
        return "app.xml";
    }

    @Override
    protected boolean isUseOneTimeContainer() {
        return true;
    }

    @Override
    public void setUp() throws Exception {
        // create runner instance

			filePattern="${log.file.basedir}/${domain.name}${backup.date.suffix}-%i.log.gz">
			<PatternLayout><Pattern>${log.pattern}</Pattern></PatternLayout><!-- <EcsLayout serviceName="fess" eventDataset="app" /> -->
			<Policies>
				<TimeBasedTriggeringPolicy />
				<SizeBasedTriggeringPolicy size="100 MB" />
			</Policies>
			<DefaultRolloverStrategy fileIndex="max" min="1"

Якщо були заплановані фонові задачі (background tasks - розглянуто далі), вони виконаються *після* всіх middleware.

///

## Створення middleware

Щоб створити middleware, Ви використовуєте декоратор `@app.middleware("http")` на функції.

Функція middleware отримує:

* `Запит`.
* Функцію `call_next`, яка приймає `запит` як параметр.
    * Ця функція передає `запит` відповідній *операції шляху*.

import org.codelibs.core.io.FileUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.service.CrawlingInfoService;
import org.codelibs.fess.app.service.PathMappingService;
import org.codelibs.fess.helper.CrawlingInfoHelper;
import org.codelibs.fess.helper.DataIndexHelper;
import org.codelibs.fess.helper.DuplicateHostHelper;

import org.apache.logging.log4j.Logger;
import org.apache.pdfbox.util.DateConverter;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.web.base.FessAdminAction;
import org.codelibs.fess.app.web.base.login.FessLoginAssist;
import org.codelibs.fess.entity.FacetQueryView;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.util.ComponentUtil;