```java
OkHttpClient client = new OkHttpClient();

String run(String url) throws IOException {
  Request request = new Request.Builder()
      .url(url)
      .build();

  try (Response response = client.newCall(request).execute()) {
    return response.body().string();
  }
}
```


Post to a Server
----------------

This program posts data to a service. [Full source][post_example].

```java

    /**
     * Constructs a new BatchRequestException with the specified message and results.
     *
     * @param <REQ> The type of the request
     * @param <REP> The type of the response
     * @param message The error message describing the batch operation failure
     * @param allResults List of results from all attempted requests in the batch
     */

import org.dbflute.optional.OptionalEntity;
import org.dbflute.optional.OptionalThing;
import org.lastaflute.web.Execute;
import org.lastaflute.web.login.exception.LoginFailureException;
import org.lastaflute.web.response.HtmlResponse;
import org.lastaflute.web.validation.VaErrorHook;

import jakarta.annotation.Resource;
import jakarta.servlet.http.HttpSession;

/**
 * The login action.
 */

            checkPutMethod(requestBody, getItemEndpointSuffix()).then().body("response.status", equalTo(0));
            refresh();
        }

        checkUpdate();
    }

    @Override
    protected List<Map<String, Object>> getItemList(final Map<String, Object> body) {
        final String response = checkMethodBase(body).get(getApiPath() + "/" + getListEndpointSuffix()).asString();

      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {}

        override fun onResponse(
          call: Call,
          response: Response,
        ) {
          response.close()
        }
      }
    repeat(10_000) {
      okhttp.newCall(Request.Builder().url(server.url("/")).build()).enqueue(callback)
    }
    okhttp.dispatcher.executorService.shutdown()

        .header("Host", "cloudflare-dns.com")
        .build()
    client.newCall(request).execute().use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(response.protocol).isEqualTo(Protocol.HTTP_2)

      assertThat(response.body.string()).contains("h=cloudflare-dns.com")
    }
  }

  @Test
  fun getWithDns() {
    client =
      client

Logging Interceptor
===================

An [OkHttp interceptor][interceptors] which logs HTTP request and response data.

```java
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(Level.BASIC);
OkHttpClient client = new OkHttpClient.Builder()
  .addInterceptor(logging)
  .build();
```

You can change the log level at any time by calling `setLevel()`.

    val call = client.newCall(networkRequest)

    call.execute().use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(response.cacheResponse).isNull()
    }

    val cachedCall = client.newCall(request)

    cachedCall.execute().use { response ->
      assertThat(response.code).isEqualTo(200)
      assertThat(response.cacheResponse).isNotNull()
    }
  }

  @Test

        c = TestClient(app, root_path=prefix)
        c.get("/openapi.json")

    # A clean request should not have any of them
    clean_client = TestClient(app)
    response = clean_client.get("/openapi.json")
    data = response.json()
    servers = [s.get("url") for s in data.get("servers", [])]
    for prefix in ["/path-a", "/path-b", "/path-c"]:
        assert prefix not in servers, (

        try (CurlResponse response = ComponentUtil.getCurlHelper() //
                .put("/" + getIndexName() + "/_doc/" + instanceId + "?refresh=true") //
                .body(body)
                .execute()) {
            if (response.getHttpStatusCode() != 200 && response.getHttpStatusCode() != 201) {
                logger.warn("Failed to send heartbeat: status={}", response.getHttpStatusCode());
            }