}

    @Execute
    @Secured({ ROLE })
    public HtmlResponse upgradeFrom(final UpgradeForm form) {
        validate(form, messages -> {}, this::asIndexHtml);
        verifyToken(this::asIndexHtml);

        if (VERSION_13_0.equals(form.targetVersion)) {
            try {
                upgradeFrom13_0();
                upgradeFrom13_1();
                upgradeFrom13_2();

    }

    @Execute
    @Secured({ ROLE })
    public HtmlResponse crawlingConfig(final CrawlingConfigForm form) {
        validate(form, messages -> {}, () -> asHtml(path_AdminWizard_AdminWizardConfigJsp));
        verifyTokenKeep(this::asIndexHtml);
        final String name = crawlingConfigInternal(form);
        saveInfo(messages -> messages.addSuccessCreateCrawlingConfigAtWizard(GLOBAL, name));

## What is "Form Data"

The way HTML forms (`<form></form>`) sends the data to the server normally uses a "special" encoding for that data, it's different from JSON.

**FastAPI** will make sure to read that data from the right place instead of JSON.

!!! note "Technical Details"
    Data from forms is normally encoded using the "media type" `application/x-www-form-urlencoded` when it doesn't include files.

package p

import "math/big"

// From go.dev/issue/18419
func _(x *big.Float) {
	x.form /* ERROR "x.form undefined (cannot refer to unexported field form)" */ ()
}

// From go.dev/issue/31053
func _() {
	_ = big.Float{form /* ERROR "cannot refer to unexported field form in struct literal of type big.Float" */ : 0}

`Form`では`Body`（および`Query`や`Path`、`Cookie`）と同じメタデータとバリデーションを宣言することができます。

!!! info "情報"
    `Form`は`Body`を直接継承するクラスです。

!!! tip "豆知識"
    フォームのボディを宣言するには、明示的に`Form`を使用する必要があります。なぜなら、これを使わないと、パラメータはクエリパラメータやボディ（JSON）パラメータとして解釈されるからです。

## 「フォームフィールド」について

HTMLフォーム（`<form></form>`）がサーバにデータを送信する方法は、通常、そのデータに「特別な」エンコーディングを使用していますが、これはJSONとは異なります。

!!! warning "Aviso"
    Você pode declarar vários parâmetros `File` e `Form` em uma *operação de caminho*, mas não é possível declarar campos `Body` para receber como JSON, pois a requisição terá o corpo codificado usando `multipart/form-data` ao invés de `application/json`.

    Isso não é uma limitação do **FastAPI** , é parte do protocolo HTTP.

## Recapitulando

class OAuth2PasswordRequestForm:
    """
    This is a dependency class to collect the `username` and `password` as form data
    for an OAuth2 password flow.

    The OAuth2 specification dictates that for a password flow the data should be
    collected using form data (instead of JSON) and that it should have the specific
    fields `username` and `password`.

    @Execute
    public ActionResponse index(final CacheForm form) {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getCacheResponseFields(), getUserBean()).orElse(null);

	}

	z.neg = x.neg != y.neg

	if x.form == finite && y.form == finite {
		// x * y (common case)
		z.umul(x, y)
		return z
	}

	z.acc = Exact
	if x.form == zero && y.form == inf || x.form == inf && y.form == zero {
		// ±0 * ±Inf
		// ±Inf * ±0
		// value of z is undefined but make sure it's valid
		z.form = zero
		z.neg = false

    public String name;

    @Size(max = 1000)
    public String description;

    @Required
    @CustomSize(maxKey = "form.admin.max.input.size")
    public String handlerName;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String handlerParameter;

    @CustomSize(maxKey = "form.admin.max.input.size")
    public String handlerScript;

    @Required
    @ValidateTypeFailure
    public Float boost;