```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

        assertEquals(statusCode, response.getHttpStatusCode());
    }

    @Test
    public void testEncoding() {
        CurlResponse response = new CurlResponse();
        String encoding = "UTF-8";

        response.setEncoding(encoding);

        assertEquals(encoding, response.getEncoding());
    }

    @Test
    public void testContentException() {

    call.execute().use { response ->
      val source = response.body.source()
      assertThat(response.header("h1")).isEqualTo("v1")
      assertThat(response.peekTrailers()).isNull()
      assertThat(source.readUtf8()).isEqualTo(responseBody)
      assertThat(response.peekTrailers()).isEqualTo(headersOf("t1", "v2"))
      assertThat(response.peekTrailers()).isEqualTo(headersOf("t1", "v2")) // Idempotent.

          .build(),
      )
    var response = call.execute()
    assertThat(response.code).isEqualTo(200)
    assertThat(response.body.string()).isEqualTo("abc")
    response.close()
    listener.clearAllEvents()
    call = call.clone()
    response = call.execute()
    assertThat(response.code).isEqualTo(200)
    assertThat(response.body.string()).isEqualTo("abc")
    response.close()

        }
        response =
          responseBuilder
            .request(request)
            .handshake(exchange.connection.handshake())
            .sentRequestAtMillis(sentRequestMillis)
            .receivedResponseAtMillis(System.currentTimeMillis())
            .build()
        code = response.code
      }

      exchange.responseHeadersEnd(response)

  }

  /**
   * Invoked immediately after receiving response headers.
   *
   * This method is always invoked after [responseHeadersStart].
   *
   * @param response the response received over the network. It is an error to access the body of
   *     this response.
   */
  open fun responseHeadersEnd(
    call: Call,
    response: Response,
  ) {
  }

  /**

 * to limit the retries by the class of errors and number of attempts.  To get the number of
 * attempts to the current point use this function.
 *
 * ```java
 * private int responseCount(Response response) {
 *   int result = 1;
 *   while ((response = response.priorResponse()) != null) {
 *     result++;
 *   }
 *   return result;
 * }
 * ```
 *
 * [1]: https://tools.ietf.org/html/rfc2817
 */

  }

  override fun reportedContentLength(response: Response): Long =
    when {
      !response.promisesBody() -> 0L
      response.isChunked -> -1L
      else -> response.headersContentLength()
    }

  override fun openResponseBodySource(response: Response): Source =
    when {
      !response.promisesBody() -> newFixedLengthSource(response.request.url, 0)
      response.isChunked -> newChunkedSource(response.request.url)

  }

  @Test
  fun response() {
    val response: Response = Response.Builder().build()
    val request: Request = response.request
    val protocol: Protocol = response.protocol
    val code: Int = response.code
    val successful: Boolean = response.isSuccessful
    val message: String = response.message
    val handshake: Handshake? = response.handshake

  }

  @Test @Disabled
  fun response() {
    val response: Response = Response.Builder().build()
    val request: Request = response.request()
    val protocol: Protocol = response.protocol()
    val code: Int = response.code()
    val message: String = response.message()
    val handshake: Handshake? = response.handshake()
    val headers: Headers = response.headers()
    val body: ResponseBody = response.body()