server.enqueue(MockResponse.Builder().body("hello world").build())
    val url = server.url("/").toUrl()
    val connection = url.openConnection() as HttpURLConnection
    connection.setRequestProperty("Accept-Language", "en-US")
    val reader = BufferedReader(InputStreamReader(connection.inputStream, UTF_8))
    assertThat(connection.responseCode).isEqualTo(HttpURLConnection.HTTP_OK)
    assertThat(reader.readLine()).isEqualTo("hello world")

# WebSockets { #websockets }

You can use <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API" class="external-link" target="_blank">WebSockets</a> with **FastAPI**.

## Install `websockets` { #install-websockets }

Make sure you create a [virtual environment](../virtual-environments.md){.internal-link target=_blank}, activate it, and install `websockets` (a Python library that makes it easy to use the "WebSocket" protocol):

<div class="termy">

    }
  }

  private static boolean equal(@Nullable Object a, @Nullable Object b) {
    return a == b || (a != null && a.equals(b));
  }

  // This one-liner saves us from some ugly casts
  protected Entry<K, V> entry(K key, V value) {
    return mapEntry(key, value);
  }

  @Override
  protected void expectContents(Collection<Entry<K, V>> expected) {

Щоб дізнатися більше про ці типи кодування та формові поля, ознайомтеся з <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST" class="external-link" target="_blank"><abbr title="Mozilla Developer Network">документацією MDN</abbr> щодо <code>POST</code></a>.

///

/// warning | Увага

 * <ul>
 *   <li>endpoint - The URL of the S3-compatible server</li>
 *   <li>accessKey - The access key for authentication</li>
 *   <li>secretKey - The secret key for authentication</li>
 *   <li>region - The AWS region (default: us-east-1)</li>
 *   <li>connectTimeout - Connection timeout in milliseconds (default: 10000)</li>
 *   <li>readTimeout - Read timeout in milliseconds (default: 10000)</li>
 * </ul>
 *

Upgrading to OkHttp 4
=====================

OkHttp 4.x upgrades our implementation language from Java to Kotlin and keeps everything else the
same. We’ve chosen Kotlin because it gives us powerful new capabilities while integrating closely
with Java.

We spent a lot of time and energy on retaining strict compatibility with OkHttp 3.x. We’re even
keeping the package name the same: `okhttp3`!

There are three kinds of compatibility we’re tracking:

	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")

    checkNotNull(executor, "Executor was null.");

    // Lock while we check state. We must maintain the lock while adding the new pair so that
    // another thread can't run the list out from under us. We only add to the list if we have not
    // yet started execution.
    synchronized (this) {
      if (!executed) {
        runnables = new RunnableExecutorPair(runnable, executor, runnables);
        return;
      }

To improve this, we’re working on automation tools 🤖 to manage translations more efficiently. Once ready, documentation will be machine-translated and still reviewed by at least two native speakers ✅ before publishing. This will allow us to keep translations up-to-date while reducing the review burden on maintainers.

What’s changing now:

* 🚫 We’re no longer accepting new community-submitted translation PRs.

// The logic to sort by last octet is implemented to
// prefer CIDRs with higher octets, this in-turn skips the
// localhost/loopback address to be not preferred as the
// first ip on the list. Subsequently this list helps us print
// a user friendly message with appropriate values.
func sortIPs(ipList []string) []string {
	if len(ipList) == 1 {
		return ipList
	}

	var ipV4s []net.IP
	var nonIPs []string