server.enqueue(
      MockResponse
        .Builder()
        .code(HttpURLConnection.HTTP_MOVED_TEMP)
        .setHeader("Location", "/b")
        .headersDelay(100, TimeUnit.MILLISECONDS)
        .build(),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .code(HttpURLConnection.HTTP_MOVED_TEMP)
        .setHeader("Location", "/c")

package okhttp3

import java.io.Closeable
import java.io.IOException
import java.net.HttpURLConnection.HTTP_MOVED_PERM
import java.net.HttpURLConnection.HTTP_MOVED_TEMP
import java.net.HttpURLConnection.HTTP_MULT_CHOICE
import java.net.HttpURLConnection.HTTP_PROXY_AUTH
import java.net.HttpURLConnection.HTTP_SEE_OTHER
import java.net.HttpURLConnection.HTTP_UNAUTHORIZED
import okhttp3.ResponseBody.Companion.asResponseBody

package okhttp3.internal.cache

import java.net.HttpURLConnection.HTTP_BAD_METHOD
import java.net.HttpURLConnection.HTTP_GONE
import java.net.HttpURLConnection.HTTP_MOVED_PERM
import java.net.HttpURLConnection.HTTP_MOVED_TEMP
import java.net.HttpURLConnection.HTTP_MULT_CHOICE
import java.net.HttpURLConnection.HTTP_NOT_AUTHORITATIVE
import java.net.HttpURLConnection.HTTP_NOT_FOUND
import java.net.HttpURLConnection.HTTP_NOT_IMPLEMENTED

    val url = server.url("/").toUrl()
    val connection = url.openConnection() as HttpURLConnection
    assertThat(connection.getResponseCode()).isEqualTo(HttpURLConnection.HTTP_OK)
    val refusedConnection = url.openConnection() as HttpURLConnection
    assertFailsWith<ConnectException> {
      refusedConnection.getResponseCode()
    }.also { expected ->

    /**
     * Opens a connection to the specified URL.
     *
     * @param u the URL
     * @return the HttpURLConnection
     * @throws IOException if an I/O exception occurs
     */
    protected HttpURLConnection open(final URL u) throws IOException {
        final HttpURLConnection connection = (HttpURLConnection) (proxy != null ? u.openConnection(proxy) : u.openConnection());

        .shutdownServer(true)
        .build(),
    )
    val url = server.url("/").toUrl()
    val connection = url.openConnection() as HttpURLConnection
    assertThat(connection.responseCode).isEqualTo(HttpURLConnection.HTTP_OK)
    val refusedConnection = url.openConnection() as HttpURLConnection
    assertFailsWith<ConnectException> {
      refusedConnection.responseCode
    }.also { expected ->

          .readResponseHeaders(false)!!
          .request(nextRequest)
          .build()
      tunnelCodec.skipConnectBody(response)

      when (response.code) {
        HttpURLConnection.HTTP_OK -> return null

        HttpURLConnection.HTTP_PROXY_AUTH -> {
          nextRequest = route.address.proxyAuthenticator.authenticate(route, response)
            ?: throw IOException("Failed to authenticate with proxy")

import java.io.InterruptedIOException
import java.net.HttpURLConnection.HTTP_CLIENT_TIMEOUT
import java.net.HttpURLConnection.HTTP_MOVED_PERM
import java.net.HttpURLConnection.HTTP_MOVED_TEMP
import java.net.HttpURLConnection.HTTP_MULT_CHOICE
import java.net.HttpURLConnection.HTTP_PROXY_AUTH
import java.net.HttpURLConnection.HTTP_SEE_OTHER
import java.net.HttpURLConnection.HTTP_UNAUTHORIZED
import java.net.HttpURLConnection.HTTP_UNAVAILABLE

 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package okhttp3.internal.cache

import java.io.IOException
import java.net.HttpURLConnection.HTTP_GATEWAY_TIMEOUT
import java.net.HttpURLConnection.HTTP_NOT_MODIFIED
import java.util.concurrent.TimeUnit.MILLISECONDS
import okhttp3.Cache
import okhttp3.EventListener
import okhttp3.Headers
import okhttp3.Interceptor

    add the `okhttp-urlconnection` module to your project and use the
    `OkUrlFactory` to create new instances of `HttpURLConnection`:

    ```java
    // OkHttp 1.x:
    HttpURLConnection connection = client.open(url);

    // OkHttp 2.x:
    HttpURLConnection connection = new OkUrlFactory(client).open(url);
    ```

 *  **Custom caches are no longer supported.** In OkHttp 1.x it was possible to