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**.

                                   WARNING!!
     ** THIS FILE MAY CONTAIN SENSITIVE INFORMATION ABOUT YOUR ENVIRONMENT ** 
     ** PLEASE INSPECT CONTENTS BEFORE SHARING IT ON ANY PUBLIC FORUM **
*********************************************************************************
mc: Health data saved to dc-11-health_20200321053323.json.gz
```

The gzipped output contains debugging information for your system

Mas `OAuth2PasswordRequestForm` é apenas uma dependência de classe que você mesmo poderia ter escrito ou poderia ter declarado os parâmetros do `Form` (formulário) diretamente.

Mas como é um caso de uso comum, ele é fornecido diretamente pelo **FastAPI**, apenas para facilitar.

///

### Use os dados do formulário { #use-the-form-data }

/// tip | Dica

        validate(form, messages -> {}, () -> asListHtml(form.dictId));
        kuromojiService.getKuromojiItem(form.dictId, form.id).ifPresent(entity -> {
            copyBeanToBean(entity, form, op -> {});
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudCouldNotFindCrudTable(GLOBAL, form.getDisplayId()),
                    () -> asListHtml(form.dictId));
        });

        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);
        }

     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse edit(final EditForm form) {
        validate(form, messages -> {}, () -> asListHtml(form.dictId));
        synonymService.getSynonymItem(form.dictId, form.id).ifPresent(entity -> {
            form.inputs = entity.getInputsValue();
            form.outputs = entity.getOutputsValue();
        }).orElse(() -> {

        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>

            searchPaging(data, form);
        });
    }

    /**
     * Searches label types based on the form criteria.
     *
     * @param form the search form
     * @return HTML response for the search results
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse search(final SearchForm form) {

     * Show the edit page.
     * @param form The edit form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse edit(final EditForm form) {
        validate(form, messages -> {}, this::asListHtml);
        final String id = form.id;
        accessTokenService.getAccessToken(id).ifPresent(entity -> {
            copyBeanToBean(entity, form,