// Add server metrics router
	registerMetricsRouter(router)

	// Add STS router always.
	registerSTSRouter(router)

	// Add KMS router
	registerKMSRouter(router)

	// Add API router
	registerAPIRouter(router)

	router.Use(globalMiddlewares...)

	return router, nil

- `version`: API のバージョン。例: `2.5.0`。
- `openapi_version`: 使用する OpenAPI 仕様のバージョン。デフォルトは最新の `3.1.0`。
- `summary`: API の短い概要。
- `description`: API の説明。Markdown を含めることができ、ドキュメントに表示されます。
- `routes`: ルートのリスト。登録済みの各 path operation です。`app.routes` から取得されます。

/// info | 情報

パラメータ `summary` は OpenAPI 3.1.0 以降で利用可能で、FastAPI 0.99.0 以降が対応しています。

///

## デフォルトの上書き { #overriding-the-defaults }

and other connections will be blocked while the large payload is being sent.

## Handlers & Routes

Handlers have a predefined Handler ID.
In addition, there can be several *static* subroutes used to differentiate between different handlers of the same ID.
A subroute on a client must match a subroute on the server. So routes cannot be used for dynamic routing, unlike HTTP.

`callback=` に渡すのはルーター本体（`invoices_callback_router`）ではなく、属性 `.routes`（`invoices_callback_router.routes`）である点に注意してください。

///

### ドキュメントを確認 { #check-the-docs }

アプリを起動して [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs) にアクセスします。

あなたの *path operation* に「Callbacks」セクションが含まれ、*外部 API* がどうあるべきかが表示されているのが確認できます:

    server.enqueue(MockResponse.Builder().onRequestStart(CloseSocket()).build())

    client =
      client
        .newBuilder()
        .dns(DoubleInetAddressDns()) // Two routes so we get two failures.
        .build()

    val request = Request(server.url("/"))
    assertFailsWith<IOException> {
      client.newCall(request).execute()
    }.also { expected ->

    automatically retry on an unshared connection.
 *  Fix: Don't crash if a TLS tunnel's response body is truncated.
 *  Fix: Don't track unusable routes beyond their usefulness. We had a bug where we could track
    certain bad routes indefinitely; now we only track the ones that could be necessary.
 *  Fix: Defer proxy selection until a proxy is required. This saves calls to `ProxySelector` on

        // Create a new list to avoid modifying the original roles list
        final List<String> rolesWithDefault = new ArrayList<>(roles.size() + 1);
        rolesWithDefault.addAll(roles);
        if (!rolesWithDefault.contains(SuggestConstants.DEFAULT_ROLE)) {
            rolesWithDefault.add(SuggestConstants.DEFAULT_ROLE);
        }
        filterList.add(buildFilterQuery(FieldNames.ROLES, rolesWithDefault));

        if (!fields.isEmpty()) {

 *  Fix: Gracefully shut down the HTTP/2 connection before it exhausts the
    namespace of stream IDs (~536 million streams).
 *  Fix: Never pass a null `Route` to `Authenticator`. There was a bug where
    routes were omitted for eagerly-closed connections.

## Version 3.9.1

_2017-11-18_

 *  New: Recover gracefully when Android's DNS crashes with an unexpected
    `NullPointerException`.

        if responses is None:
            responses = {}
        for route in router.routes:
            if isinstance(route, APIRoute):
                combined_responses = {**responses, **route.responses}
                use_response_class = get_value_or_default(
                    route.response_class,
                    router.default_response_class,
                    default_response_class,

    // we should try the next route (if there is one).
    if (e is InterruptedIOException) {
      return e is SocketTimeoutException && !requestSendStarted
    }

    // Look for known client-side or negotiation errors that are unlikely to be fixed by trying
    // again with a different route.
    if (e is SSLHandshakeException) {