You can add code to be run with the `request`,  before any *path operation* receives it.

And also after the `response` is generated, before returning it.

For example, you could add a custom header `X-Process-Time` containing the time in seconds that it took to process the request and generate a response:

```Python hl_lines="10  12-13"
{!../../docs_src/middleware/tutorial001.py!}
```

/// tip

    protected CrawlerContainer crawlerContainer;

    protected Transformer transformer;

    protected int[] successfulHttpCodes;

    protected int[] notModifiedHttpCodes;

    @Override
    public void process(final ResponseData responseData) {
        if (isNotModified(responseData)) {
            final UrlQueue<?> urlQueue = CrawlingParameterUtil.getUrlQueue();
            final ResultData resultData = new ResultData();

    "crossVersionTests": false
  },
  {
    "name": "process-memory-services",
    "path": "platforms/core-runtime/process-memory-services",
    "unitTests": true,
    "functionalTests": true,
    "crossVersionTests": false
  },
  {
    "name": "process-services",
    "path": "platforms/core-runtime/process-services",
    "unitTests": false,
    "functionalTests": false,

    }

    public CurlResponse execute() {
        this.threadPool = null;
        final RequestProcessor processor = new RequestProcessor(encoding, threshold);
        connect(processor, e -> {
            throw new CurlException("Failed to process a request.", e);
        });
        return processor.getResponse();
    }

    protected String encode(final String value) {
        try {

 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.crawler.processor;

import org.codelibs.fess.crawler.entity.ResponseData;

/**
 * @author shinsuke
 *
 */
public interface ResponseProcessor {

    void process(ResponseData responseData);

import org.gradle.api.services.BuildServiceParameters
import org.gradle.api.tasks.testing.TestDescriptor
import org.gradle.api.tasks.testing.TestListener
import org.gradle.api.tasks.testing.TestResult
import org.gradle.process.ExecOperations
import org.slf4j.LoggerFactory
import java.util.concurrent.ConcurrentHashMap
import javax.inject.Inject


private
val logger = LoggerFactory.getLogger("daemonTracker")

1. What version of Go are you using (`go version`)?
2. What operating system and processor architecture are you using?
3. What did you do?
4. What did you expect to see?
5. What did you see instead?

For change proposals, see [Proposing Changes To Go](https://go.dev/s/proposal-process).

## Contributing code

    myargs=("${residual_args[@]}")
    residual_args=()
    process_my_args "${myargs[@]}"
  }
}

# Actually runs the script.
run() {
  # TODO - check for sane environment

  # process the combined args, then reset "$@" to the residuals
  process_args "$@"
  detect_terminal_for_ui
  set -- "${residual_args[@]}"
  argumentCount=$#

  #check for jline terminal fixes on cygwin

					"time",
					"logging-api",
					"public-api-tests",
					"kotlin-dsl-plugins",
					"serialization",
					"toolchains-jvm-shared",
					"build-process-services",
					"docs-asciidoctor-extensions-base",
					"internal-instrumentation-processor"
				]
			},
			{
				"parallelizationMethod":{
					"name":"TestDistribution"
				},
				"subprojects":[
					"testing-jvm",
					"security",

* Processing data:
    * For example, let's say you receive a file that must go through a slow process, you can return a response of "Accepted" (HTTP 202) and process the file in the background.

## Using `BackgroundTasks`

First, import `BackgroundTasks` and define a parameter in your *path operation function* with a type declaration of `BackgroundTasks`: