BaseEncoding ignoreCase = base16().ignoreCase();
    assertThat(ignoreCase).isNotSameInstanceAs(base16());
    assertThat(ignoreCase).isSameInstanceAs(base16().ignoreCase());
    testEncodingWithCasing(ignoreCase, "foobar", "666F6F626172");
    testDecodes(ignoreCase, "666F6F626172", "foobar");
    testDecodes(ignoreCase, "666f6f626172", "foobar");
    testDecodes(ignoreCase, "666F6f626172", "foobar");
  }

    BaseEncoding ignoreCase = base16().ignoreCase();
    assertThat(ignoreCase).isNotSameInstanceAs(base16());
    assertThat(ignoreCase).isSameInstanceAs(base16().ignoreCase());
    testEncodingWithCasing(ignoreCase, "foobar", "666F6F626172");
    testDecodes(ignoreCase, "666F6F626172", "foobar");
    testDecodes(ignoreCase, "666f6f626172", "foobar");
    testDecodes(ignoreCase, "666F6f626172", "foobar");
  }

    private fun bodyHasUnknownEncoding(headers: Headers): Boolean {
      val contentEncoding = headers["Content-Encoding"] ?: return false
      return !contentEncoding.equals("identity", ignoreCase = true) &&
        !contentEncoding.equals("gzip", ignoreCase = true)
    }

    private fun bodyIsStreaming(response: Response): Boolean {
      val contentType = response.body.contentType()

    // Silently replace web socket URLs with HTTP URLs.
    private fun canonicalUrl(url: String) =
      when {
        url.startsWith("ws:", ignoreCase = true) -> "http:${url.substring(3)}"
        url.startsWith("wss:", ignoreCase = true) -> "https:${url.substring(4)}"
        else -> url
      }

    /**
     * Sets the URL target of this request.
     *

     */
    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)
        }