this.settings = Settings()
    }

    internal constructor(mockResponse: MockResponse) {
      this.inTunnel = mockResponse.inTunnel
      this.informationalResponses = mockResponse.informationalResponses.toMutableList()
      this.status = mockResponse.status
      this.headers = mockResponse.headers.newBuilder()
      this.trailers = mockResponse.trailers.newBuilder()
      this.bodyVar = mockResponse.body

  return headers["Content-Length"]?.toLongOrDefault(-1L) ?: -1L
}

/** Returns an immutable copy of this. */
internal fun <T> List<T>.toImmutableList(): List<T> {
  return Collections.unmodifiableList(toMutableList())
}

/** Returns an immutable list containing [elements]. */
@SafeVarargs
internal fun <T> immutableListOf(vararg elements: T): List<T> {
  return Collections.unmodifiableList(listOf(*elements.clone()))
}