private val headersReader = HeadersReader(socket.source)

  private val Response.isChunked: Boolean
    get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)

  private val Request.isChunked: Boolean
    get() = "chunked".equals(header("Transfer-Encoding"), ignoreCase = true)

  /**
   * Trailers received when the response body became exhausted.
   *

        }

        var reuseSocket = true
        val requestWantsSocket = "Upgrade".equals(request.headers["Connection"], ignoreCase = true)
        val requestWantsWebSocket =
          requestWantsSocket &&
            "websocket".equals(request.headers["Upgrade"], ignoreCase = true)
        val responseWantsSocket = response.socketHandler != null
        val responseWantsWebSocket = response.webSocketListener != null

    val responseBuilder =
      networkResponse
        .newBuilder()
        .request(networkRequest)

    if (transparentGzip &&
      "gzip".equals(networkResponse.header("Content-Encoding"), ignoreCase = true) &&
      networkResponse.promisesBody()
    ) {
      val responseBody = networkResponse.body
      if (responseBody != null) {
        val gzipSource = GzipSource(responseBody.source())

   * such a parameter.
   */
  fun parameter(name: String): String? {
    for (i in parameterNamesAndValues.indices step 2) {
      if (parameterNamesAndValues[i].equals(name, ignoreCase = true)) {
        return parameterNamesAndValues[i + 1]
      }
    }
    return null
  }

  @JvmName("-deprecated_type")
  @Deprecated(
    message = "moved to val",

          val domainName = fromSource.readUtf8(domainNameLength.toLong())
          // Resolve HOSTNAME_THAT_ONLY_THE_PROXY_KNOWS to localhost.
          when {
            domainName.equals(HOSTNAME_THAT_ONLY_THE_PROXY_KNOWS, ignoreCase = true) -> {
              InetAddress.getByName("localhost")
            }
            else -> InetAddress.getByName(domainName)
          }
        }

    if (!"Upgrade".equals(headerConnection, ignoreCase = true)) {
      throw ProtocolException(
        "Expected 'Connection' header value 'Upgrade' but was '$headerConnection'",
      )
    }

    val headerUpgrade = response.header("Upgrade")
    if (!"websocket".equals(headerUpgrade, ignoreCase = true)) {
      throw ProtocolException(

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

          if ("close".equals(response.header("Connection"), ignoreCase = true)) {
            return nextRequest
          }
        }

        else -> throw IOException("Unexpected response code for CONNECT: ${response.code}")
      }
    }
  }

  /**

   */
  private fun decodeLabel(
    string: String,
    pos: Int,
    limit: Int,
    result: Buffer,
  ): Boolean {
    if (!string.regionMatches(pos, PREFIX_STRING, 0, 4, ignoreCase = true)) {
      result.writeUtf8(string, pos, limit)
      return true
    }

    var pos = pos + 4 // 'xn--'.size.

     */
    private fun Headers.varyFields(): Set<String> {
      var result: MutableSet<String>? = null
      for (i in 0 until size) {
        if (!"Vary".equals(name(i), ignoreCase = true)) {
          continue
        }

        val value = value(i)
        if (result == null) {
          result = TreeSet(String.CASE_INSENSITIVE_ORDER)
        }

      .assertCode(200)
      .assertBody("success!")

    assertThat(proxySelector.failures)
      .all {
        hasSize(1)
        index(0).matches(".* Connect timed out".toRegex(RegexOption.IGNORE_CASE))
      }
  }

  /** https://github.com/square/okhttp/issues/4875  */
  @Test
  fun interceptorRecoversWhenRoutesExhausted() {