---

## **Typer**, giao diện dòng lệnh của FastAPI

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
    final ProgressListener progressListener = new ProgressListener() {
      boolean firstUpdate = true;

      @Override public void update(long bytesWritten, long contentLength, boolean done) {

<img src="/img/async/concurrent-burgers/concurrent-burgers-03.png" class="illustration">

You pay. 💸

The cashier gives you the number of your turn.

<img src="/img/async/concurrent-burgers/concurrent-burgers-04.png" class="illustration">

While you are waiting, you go with your crush and pick a table, you sit and talk with your crush for a long time (as your burgers are very fancy and take some time to prepare).

        assertEquals("Status of production-cluster is changed to GREEN.", result);
    }

    // Test with exception during ping
    public void test_execute_pingException() {
        SearchEngineClient searchEngineClient = new SearchEngineClient() {
            @Override
            public PingResponse ping() {
                throw new RuntimeException("Connection failed");
            }
        };

    }

    /**
     * Test very long URL handling
     */
    public void test_veryLongUrl() {
        String sessionId = "test-session-020";
        urlFilter.init(sessionId);

        // Create a very long URL
        StringBuilder longUrl = new StringBuilder("https://example.com/");
        for (int i = 0; i < 1000; i++) {
            longUrl.append("very/long/path/segment/");
        }

    "-Dorg.gradle.java.installations.auto-download=false",
    "-Porg.gradle.java.installations.auto-download=false",
) + os.javaInstallationLocations(arch) +
    listOf(
        "-Porg.gradle.performance.branchName" to "%teamcity.build.branch%",
        "-Porg.gradle.performance.db.url" to "%performance.db.url%",
        "-Porg.gradle.performance.db.username" to "%performance.db.username%",

        private final int activeSessions;
        private final int totalChannels;
        private final long totalRequests;
        private final long totalChannelsCreated;

        public ChannelStatistics(int activeSessions, int totalChannels, long totalRequests, long totalChannelsCreated) {
            this.activeSessions = activeSessions;
            this.totalChannels = totalChannels;

Thêm nữa, điều này cũng thể hiện cam kết thực sự của họ đối với FastAPI và **cộng đồng người dùng** (bạn), vì họ không chỉ muốn cung cấp cho bạn một **dịch vụ tốt** mà còn muốn đảm bảo rằng bạn có một **framework tốt và bền vững**, đó chính là FastAPI. 🙇

Bạn có thể thử các dịch vụ của họ và làm theo hướng dẫn của họ:

In this case, you would accept any `dict` as long as it has `int` keys with `float` values:

{* ../../docs_src/body_nested_models/tutorial009_py39.py hl[7] *}

/// tip

Keep in mind that JSON only supports `str` as keys.

But Pydantic has automatic data conversion.

<img src="/img/tutorial/websockets/image01.png">

You can type messages in the input box, and send them:

<img src="/img/tutorial/websockets/image02.png">

And your **FastAPI** application with WebSockets will respond back:

<img src="/img/tutorial/websockets/image03.png">

You can send (and receive) many messages:

<img src="/img/tutorial/websockets/image04.png">