override fun toString(): String = "${name.utf8()}: ${value.utf8()}"

  companion object {
    // Special header names defined in HTTP/2 spec.
    @JvmField val PSEUDO_PREFIX: ByteString = ":".encodeUtf8()

    const val RESPONSE_STATUS_UTF8 = ":status"
    const val TARGET_METHOD_UTF8 = ":method"
    const val TARGET_PATH_UTF8 = ":path"
    const val TARGET_SCHEME_UTF8 = ":scheme"

    } catch (e: ConnectException) {
      throw ConnectException("Failed to connect to ${route.socketAddress}").apply {
        initCause(e)
      }
    }

    // The following try/catch block is a pseudo hacky way to get around a crash on Android 7.0
    // More details:
    // https://github.com/square/okhttp/issues/3245
    // https://android-review.googlesource.com/#/c/271775/
    try {

              writeByteString(value)
              insertIntoDynamicTable(header)
            }
            name.startsWith(Header.PSEUDO_PREFIX) && TARGET_AUTHORITY != name -> {
              // Follow Chromes lead - only include the :authority pseudo header, but exclude all other
              // pseudo headers. Literal Header Field without Indexing - Indexed Name.
              writeInt(headerNameIndex, PREFIX_4_BITS, 0)