OkHttp includes a library for testing HTTP, HTTPS, and HTTP/2 clients.

The latest release is available on [Maven Central](https://search.maven.org/artifact/com.squareup.okhttp3/mockwebserver/5.3.0/jar).

```kotlin
testImplementation("com.squareup.okhttp3:mockwebserver3:5.3.0")
```

MockWebServer is used for firstly for internal testing, and for basic testing of apps using OkHttp client.

///

Avec cela, vous pouvez connecter le WebSocket puis envoyer et recevoir des messages :

<img src="/img/tutorial/websockets/image05.png">

## Gérer les déconnexions et plusieurs clients { #handling-disconnections-and-multiple-clients }

Lorsqu'une connexion WebSocket est fermée, l'instruction `await websocket.receive_text()` lèvera une exception `WebSocketDisconnect`, que vous pouvez ensuite intercepter et gérer comme dans cet exemple.

    /**
     * Negotiate password hashes with MSIE clients using NTLM SSP
     * @param req The servlet request
     * @param resp The servlet response
     * @param skipAuthentication If true the negotiation is only done if it is
     * initiated by the client (MSIE post requests after successful NTLM SSP
     * authentication). If false and the user has not been authenticated yet
     * the client will be forced to send an authentication (server sends

 * called certificate authorities (CAs).
 *
 * Browsers and other HTTP clients need a set of trusted root certificates to authenticate their
 * peers. Sets of root certificates are managed by either the HTTP client (like Firefox), or the
 * host platform (like Android). In July 2018 Android had 134 trusted root certificates for its HTTP
 * clients to trust.
 *

//    //  org.bouncycastle.tls.TlsFatalAlertReceived: handshake_failure(40)
//    platform.assumeNotBouncyCastle()

    val client = makeClient()
    makeRequest(client)

    // As of OkHttp 5 we now apply the ordering from the OkHttpClient, which defaults to MODERN_TLS
    // Clients might need a changed order, but can at least define a preferred order to override that default.
    val socketOrderedByDefaults =

## Do not Separate Schemas { #do-not-separate-schemas }

Now, there are some cases where you might want to have the **same schema for input and output**.

	// If a mux id is specified that mux is pinged.
	// Clients send ping requests.
	OpPing

	// OpPong is a OpPing response returned by the server.
	OpPong

	// OpConnectMux will connect a new mux with optional payload.
	OpConnectMux

	// OpMuxConnectError is an  error while connecting a mux.
	OpMuxConnectError

	// OpDisconnectClientMux instructs a client to disconnect a mux
	OpDisconnectClientMux

     * @return the number of documents processed
     */
    public static long scroll(final String index, final Function<SearchHit, Boolean> callback) {
        final SearchEngineClient client = ComponentUtil.getSearchEngineClient();
        return client.<SearchHit> scrollSearch(index, searchRequestBuilder -> true, (searchResponse, hit) -> hit,
                hit -> callback.apply(hit));
    }

    /**

Nous créons maintenant un modèle `HeroCreate`, c'est celui qui **validera** les données provenant des clients.

Il a les mêmes champs que `HeroBase`, et il a aussi `secret_name`.

Maintenant, lorsque les clients **créent un nouveau héros**, ils enverront `secret_name`, il sera stocké dans la base, mais ces noms secrets ne seront pas renvoyés dans l'API aux clients.

/// tip | Astuce

  fun okHttpClient() {
    val client = OkHttpClient()
    val dispatcher: Dispatcher = client.dispatcher()
    val proxy: Proxy? = client.proxy()
    val protocols: List<Protocol> = client.protocols()
    val connectionSpecs: List<ConnectionSpec> = client.connectionSpecs()
    val interceptors: List<Interceptor> = client.interceptors()
    val networkInterceptors: List<Interceptor> = client.networkInterceptors()