* _last_ request, but it remembers the (expected) time of the _next_ request. This also enables
   * us to tell immediately (see tryAcquire(timeout)) whether a particular timeout is enough to get
   * us to the point of the next scheduling time, since we always maintain that. And what we mean by
   * "an unused RateLimiter" is also defined by that notion: when we observe that the

	expectedQuery := url.Values{}
	expectedQuery.Set("prefix", "Hello*World*")
	expectedQuery.Set("X-Amz-Algorithm", "AWS4-HMAC-SHA256")
	expectedQuery.Set("X-Amz-Credential", "USWUXHGYZQYFYFFIT3RE/20170529/us-east-1/s3/aws4_request")
	expectedQuery.Set("X-Amz-Date", "20170529T190139Z")
	expectedQuery.Set("X-Amz-Expires", "600")
	expectedQuery.Set("X-Amz-SignedHeaders", "host")

# WebSockets { #websockets }

**FastAPI**で[WebSockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API)が使用できます。

## `websockets`のインストール { #install-websockets }

[仮想環境](../virtual-environments.md)を作成し、それを有効化してから、「WebSocket」プロトコルを簡単に使えるようにするPythonライブラリの`websockets`をインストールしてください。

<div class="termy">

```console
$ pip install websockets

---> 100%
```

</div>

## WebSockets クライアント { #websockets-client }

                /* negotiation complete, remove the challenge object */
                ssn.removeAttribute("NtlmHttpChal");
            } else {
                final String auth = new String(Base64.decode(msg.substring(6)), "US-ASCII");
                int index = auth.indexOf(':');
                String user = index != -1 ? auth.substring(0, index) : auth;
                final String password = index != -1 ? auth.substring(index + 1) : "";

             * corresponds to the least significant nonzero byte in lw ^ rw, since lw and rw are
             * little-endian. Long.numberOfTrailingZeros(diff) tells us the least significant
             * nonzero bit, and zeroing out the first three bits of L.nTZ gives us the shift to get
             * that least significant nonzero byte.
             */
            int n = Long.numberOfTrailingZeros(lw ^ rw) & ~0x7;

	for line := range strings.SplitSeq(errMsg, "\n") {
		if len(line) == 0 {
			// No more text to print, just quit.
			break
		}

		// Save the attributes of the current cursor helps
		// us save the text color of the passed error message
		ansiSaveAttributes()
		// Print banner with or without the log tag
		if !tagPrinted {
			fmt.Fprint(Output, logBanner)
			tagPrinted = true
		} else {

dance?
Will you, won't you, will you, won't you, won't you join the
dance?


"You can really have no notion how delightful it will be
When they take us up and throw us, with the lobsters, out to
                                                      sea!"
But the snail replied "Too far, too far!" and gave a look
                                                       askance--

}

// Work around issue 8826, where the Sentry SDK assumes that OkHttp's internal-visibility symbols
// will be suffixed '$okhttp' in deployable artifacts. This isn't intended to be a published API,
// but it's easy enough for us to keep it working. https://github.com/square/okhttp/issues/8826
tasks.withType<KotlinCompile> {
  compilerOptions {
    freeCompilerArgs.addAll("-module-name=okhttp", "-Xexpect-actual-classes")
  }

	"github.com/cespare/xxhash/v2"
	jsoniter "github.com/json-iterator/go"
)

// XL constants.
const (
	// XL metadata file carries per object metadata.
	xlStorageFormatFileV1 = "xl.json"
)

// Valid - tells us if the format is sane by validating
// format version and erasure coding information.
func (m *xlMetaV1Object) valid() bool {
	return isXLMetaFormatValid(m.Version, m.Format) &&

**Server-Sent Events** (SSE) を使うと、クライアントへデータをストリーミングできます。

これは[JSON Lines のストリーミング](stream-json-lines.md)に似ていますが、`text/event-stream` フォーマットを使用します。これはブラウザがネイティブに [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource) でサポートしています。

/// info | 情報

FastAPI 0.135.0 で追加されました。

///

## Server-Sent Events とは { #what-are-server-sent-events }

SSE は、HTTP 経由でサーバーからクライアントへデータをストリーミングするための標準です。