### EventListener

Subclass [EventListener](https://square.github.io/okhttp/3.x/okhttp/okhttp3/EventListener.html) and override methods for the events you are interested in. In a successful HTTP call with no redirects or retries the sequence of events is described by this flow.

![Events Diagram](../assets/images/******@****.***)

    assertContent("c", getResponse(newRequest("/a")))
    val challengeResponse = authenticator.responses[0]
    assertThat(challengeResponse.request.url.toUrl().path).isEqualTo("/b")
    val redirectedBy = challengeResponse.priorResponse
    assertThat(redirectedBy!!.request.url.toUrl().path).isEqualTo("/a")
  }

  @Test
  fun attemptAuthorization20Times() {
    for (i in 0..19) {
      server.enqueue(

            throwValidationError(messages -> messages.addErrorsFileIsNotSupported(GLOBAL, fileName), this::asListHtml);
        }
        saveInfo(messages -> messages.addSuccessBulkProcessStarted(GLOBAL));
        return redirect(getClass()); // no-op
    }

    protected void asyncImport(final String fileName, final File tempFile) {
        final int fileType;
        if (fileName.startsWith("system") && fileName.endsWith(".properties")) {

/// tip | "Tipp"

Möglicherweise ist `ORJSONResponse` eine schnellere Alternative.

///

### `RedirectResponse`

Gibt eine HTTP-Weiterleitung (HTTP-Redirect) zurück. Verwendet standardmäßig den Statuscode 307 – Temporäre Weiterleitung (Temporary Redirect).

Sie können eine `RedirectResponse` direkt zurückgeben:

```Python hl_lines="2  9"
{!../../docs_src/custom_response/tutorial006.py!}
```

---

		log.Printf("%s %s", r.Method, r.RequestURI)
		if r.RequestURI != "/" {
			http.NotFound(w, r)
			return
		}
		if clientSec != "" {
			http.Redirect(w, r, config.AuthCodeURL(state), http.StatusFound)
		} else {
			http.Redirect(w, r, implicitFlowURL(config, state), http.StatusFound)
		}
	})

	http.HandleFunc("/oauth2/callback", func(w http.ResponseWriter, r *http.Request) {

import static org.junit.Assert.assertTrue;

import com.google.common.testing.EqualsTester;
import java.util.Set;
import org.junit.After;
import org.junit.Test;

/**
 * Abstract base class for testing undirected {@link Graph} implementations defined in this package.
 */
public abstract class AbstractStandardUndirectedGraphTest extends AbstractGraphTest {

  @After
  public void validateUndirectedEdges() {

            "Test",
            "Redirect from /a to /b",
          ),
        body = "/a has moved!",
      ),
    )
    server.enqueue(
      MockResponse(body = "this is the redirect target"),
    )

    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()
    assertThat(response.body.string()).isEqualTo("this is the redirect target")

{!../../docs_src/custom_response/tutorial001.py!}
```

/// tip

It's possible that `ORJSONResponse` might be a faster alternative.

///

### `RedirectResponse`

Returns an HTTP redirect. Uses a 307 status code (Temporary Redirect) by default.

You can return a `RedirectResponse` directly:

```Python hl_lines="2  9"
{!../../docs_src/custom_response/tutorial006.py!}
```

---

Swagger UI will handle it behind the scenes for you, but it needs this "redirect" helper.

///

### Create a *path operation* to test it

Now, to be able to test that everything works, create a *path operation*:

{* ../../docs_src/custom_docs_ui/tutorial001.py hl[36:38] *}

    //                                                                           =========

    protected HtmlResponse asDictIndexHtml() {
        return redirect(AdminDictAction.class);
    }

    private HtmlResponse asListHtml(final String dictId) {
        return asHtml(path_AdminDictStopwords_AdminDictStopwordsJsp).renderWith(data -> {