*  Fix: Handle response code `308 Permanent Redirect`.
 *  Fix: Don't skip the callback if a call is canceled.
 *  Fix: Permit hostnames with underscores.
 *  Fix: Permit overriding the content-type in `OkApacheClient`.
 *  Fix: Use the socket factory for direct connections.
 *  Fix: Honor `OkUrlFactory` APIs that disable redirects.
 *  Fix: Don't crash on concurrent modification of `SPDY` SPDY settings.

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

/// tip | "豆知識"

`ORJSONResponse` のほうが高速な代替かもしれません。

///

### `RedirectResponse`

HTTPリダイレクトを返します。デフォルトでは307ステータスコード (Temporary Redirect) となります。

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

### `StreamingResponse`

非同期なジェネレータか通常のジェネレータ・イテレータを受け取り、レスポンスボディをストリームします。

```Python hl_lines="2  14"

            }
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL), this::asEditHtml);
        });
        return redirect(getClass());
    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse update(final EditForm form) {
        verifyCrudMode(form.crudMode, CrudMode.EDIT);

    //                                                                           =========

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

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

                    form.num = (Integer) resultsPerPage;
                }
            }
        }

        if (StringUtil.isBlank(form.q) && form.fields.isEmpty() && !form.hasConditionQuery()) {
            // redirect to index page
            form.q = null;
            return redirectToRoot();
        }

        try {
            buildFormParams(form);
            form.lang = searchHelper.getLanguages(request, form);

  /**
   * Regression test for an edge case where closing response body in the HTTP engine doesn't release
   * the corresponding stream allocation. This test keeps those response bodies alive and reads
   * them after the redirect has completed. This forces a connection to not be reused where it would
   * be otherwise.
   *
   *
   * This test leaks a response body by not closing it.
   *
   * https://github.com/square/okhttp/issues/2409

    <img src="https://github.com/fastapi/fastapi/workflows/Test/badge.svg?event=push&branch=master" alt="Test">
</a>
<a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/fastapi" target="_blank">
    <img src="https://coverage-badge.samuelcolvin.workers.dev/fastapi/fastapi.svg" alt="Coverage">
</a>
<a href="https://pypi.org/project/fastapi" target="_blank">

            AdminMaintenanceAction.ROLE + VIEW, //
            AdminEsreqAction.ROLE, //
            AdminEsreqAction.ROLE + VIEW,//

    })
    public HtmlResponse index() {
        return redirect(getUserBean().map(user -> {
            final Class<? extends FessAdminAction> actionClass = getAdminActionClass(user);
            if (actionClass != null) {
                return actionClass;
            }

    //                                                                           =========

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

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

    //                                                                           =========

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

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