* See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

import okhttp3.internal.http2.flowcontrol.WindowCounter

interface FlowControlListener {
  /**
   * Notification that the receiving stream flow control window has changed.
   * [WindowCounter] generally carries the client view of total and acked bytes.
   */

OkHttpDebugLogging.enableTaskRunner()
```

### Activating on Android

```
$ adb shell setprop log.tag.okhttp.Http2 DEBUG
$ adb shell setprop log.tag.okhttp.TaskRunner DEBUG
$ adb logcat '*:E' 'okhttp.Http2:D' 'okhttp.TaskRunner:D'
```

### HTTP/2 Frame Logging

This logs inbound (`<<`) and outbound (`>>`) frames for HTTP/2 connections.

```
[2020-01-01 00:00:00] >> CONNECTION 505249202a20485454502f322e300d0a0d0a534d0d0a0d0a

    serverTruncatesRequestButTrailersCanStillBeRead(http2 = false)
  }

  @Test
  fun serverTruncatesRequestButTrailersCanStillBeReadHttp2() {
    enableProtocol(Protocol.HTTP_2)
    serverTruncatesRequestButTrailersCanStillBeRead(http2 = true)
  }

  private fun serverTruncatesRequestButTrailersCanStillBeRead(http2: Boolean) {
    val mockResponse =
      MockResponse
        .Builder()

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

/** http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-7 */
enum class ErrorCode constructor(
  val httpCode: Int,
) {
  /** Not an error!  */
  NO_ERROR(0),

  PROTOCOL_ERROR(1),

  INTERNAL_ERROR(2),

  FLOW_CONTROL_ERROR(3),

import assertk.assertions.isEqualTo
import assertk.assertions.isNotNull
import assertk.assertions.isNull
import assertk.assertions.matches
import java.net.http.HttpClient
import java.net.http.HttpClient.Redirect.NORMAL
import java.net.http.HttpRequest
import java.net.http.HttpResponse.BodyHandlers
import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.junit5.StartStop

          if (Thread.currentThread() != currentThread) {
            return
          }

          // https://timothybasanov.com/2016/05/26/java-pre-master-secret.html
          // https://security.stackexchange.com/questions/35639/decrypting-tls-in-wireshark-when-using-dhe-rsa-ciphersuites
          // https://stackoverflow.com/questions/36240279/how-do-i-extract-the-pre-master-secret-using-an-openssl-based-client

      headersOf(
        ":status",
        "200 OK",
        ":version",
        "HTTP/1.1",
        "connection",
        "close",
      )
    val request = Request.Builder().url("http://square.com/").build()
    val response = readHttp2HeadersList(headerBlock, Protocol.HTTP_2).request(request).build()
    val headers = response.headers
    assertThat(headers.size).isEqualTo(1)
    assertThat(headers.name(0)).isEqualTo(":version")

import okhttp3.internal.buildConnectionPool
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.concurrent.withLock
import okhttp3.internal.connection.RealConnectionPool
import okhttp3.internal.http2.Http2
import okhttp3.internal.taskRunnerInternal
import okhttp3.testing.Flaky
import okhttp3.testing.PlatformRule.Companion.LOOM_PROPERTY
import okhttp3.testing.PlatformRule.Companion.getPlatformSystemProperty

import okhttp3.Protocol
import okhttp3.Request
import okhttp3.TlsVersion
import okhttp3.brotli.Brotli
import okhttp3.dnsoverhttps.DnsOverHttps
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.http2.Http2
import okhttp3.internal.platform.Android10Platform
import okhttp3.internal.platform.AndroidPlatform
import okhttp3.internal.platform.Platform
import okhttp3.internal.platform.PlatformRegistry

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.http2

import java.io.IOException

/** Thrown when an HTTP/2 stream is canceled without damage to the socket that carries it. */
class StreamResetException(
  @JvmField val errorCode: ErrorCode,