Imaginemos que tienes tu API de **backend** en algún dominio.

Y tienes un **frontend** en otro dominio o en un path diferente del mismo dominio (o en una aplicación móvil).

Y quieres tener una forma para que el frontend se autentique con el backend, usando un **username** y **password**.

Podemos usar **OAuth2** para construir eso con **FastAPI**.

Dessa forma, a aplicação seria capaz de saber qual é sua própria URL pública, se está usando HTTPS, o domínio, etc.

Isso seria útil, por exemplo, para lidar corretamente com redirecionamentos.

/// tip | Dica

        if (form.storageAccessKey != null && StringUtil.isNotBlank(form.storageAccessKey.replace("*", " "))) {
            fessConfig.setStorageAccessKey(form.storageAccessKey);
        }
        if (form.storageSecretKey != null && StringUtil.isNotBlank(form.storageSecretKey.replace("*", " "))) {
            fessConfig.setStorageSecretKey(form.storageSecretKey);
        }

        validate(form, messages -> {}, () -> asListHtml(form.dictId));
        protwordsService.getProtwordsItem(form.dictId, form.id).ifPresent(entity -> {
            form.input = entity.getInputValue();
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudCouldNotFindCrudTable(GLOBAL, form.getDisplayId()),
                    () -> asListHtml(form.dictId));
        });

                                    </div>
                                </div>
                                <div class="form-group row">
                                    <label for="confirmPassword" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.user_confirm_password"/></label>

            });
        });
    }

    /**
     * Displays the form for editing an existing path mapping.
     *
     * @param form the edit form containing the path mapping ID and data
     * @return HTML response for the path mapping edit form
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse edit(final EditForm form) {

     * Gets a group entity from the form with attributes.
     *
     * @param form the create form
     * @return optional group entity
     */
    public static OptionalEntity<Group> getGroup(final CreateForm form) {
        return getEntity(form).map(entity -> {
            copyMapToBean(form.attributes, entity, op -> op.exclude(Constants.COMMON_CONVERSION_RULE));

                    form.name = null;
                });
                form.crudMode = CrudMode.CREATE;
            });
        });
    }

    /**
     * Displays the form for editing an existing web crawler configuration.
     *
     * @param form the edit form containing web config ID
     * @return HTML response for the web config edit form
     */
    @Execute

    /**
     * Displays the form for editing an existing related query item.
     *
     * @param form the edit form containing the ID of the item to edit
     * @return HTML response for the edit form
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse edit(final EditForm form) {
        validate(form, messages -> {}, this::asListHtml);
        final String id = form.id;

                                    <label for="urls" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.urls"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="urls"/>
                                        <la:textarea styleId="urls" property="urls" styleClass="form-control"