} else {
      null
    }
  }

  fun validateCloseCode(code: Int) {
    val message = closeCodeExceptionMessage(code)
    require(message == null) { message!! }
  }

  fun acceptHeader(key: String): String {
    return (key + ACCEPT_MAGIC).encodeUtf8().sha1().base64()
  }

import okhttp3.TestUtil.repeat
import okhttp3.WebSocket
import okhttp3.WebSocketListener
import okhttp3.internal.UnreadableResponseBody
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.ws.WebSocketProtocol.acceptHeader
import okhttp3.testing.Flaky
import okhttp3.testing.PlatformRule
import okio.Buffer
import okio.ByteString
import okio.ByteString.Companion.decodeHex
import okio.ByteString.Companion.encodeUtf8

    response: MockResponse,
  ) {
    val key = request.headers["Sec-WebSocket-Key"]
    val webSocketResponse =
      response.newBuilder()
        .setHeader("Sec-WebSocket-Accept", WebSocketProtocol.acceptHeader(key!!))
        .build()
    writeHttpResponse(socket, sink, webSocketResponse)

    // Adapt the request and response into our Request and Response domain model.