private val parameterNamesAndValues: Array<String>,
) {
  /**
   * Returns the charset of this media type, or [defaultValue] if either this media type doesn't
   * specify a charset, or if its charset is unsupported by the current runtime.
   */
  @JvmOverloads
  fun charset(defaultValue: Charset? = null): Charset? {
    val charset = parameter("charset") ?: return defaultValue

   * @param url the URL to read from
   * @param charset the charset used to decode the input stream; see {@link StandardCharsets} for
   *     helpful predefined constants
   * @return a string containing all the characters from the URL
   * @throws IOException if an I/O error occurs.
   */
  public static String toString(URL url, Charset charset) throws IOException {
    return asCharSource(url, charset).read();
  }

  /**

   */
  class AsCharSource extends CharSource {

    final Charset charset;

    AsCharSource(Charset charset) {
      this.charset = checkNotNull(charset);
    }

    @Override
    public ByteSource asByteSource(Charset charset) {
      if (charset.equals(this.charset)) {
        return ByteSource.this;
      }

    }
  }

  /**
   * A char sink that encodes written characters with a charset and writes resulting bytes to this
   * byte sink.
   */
  private final class AsCharSink extends CharSink {

    private final Charset charset;

    private AsCharSink(Charset charset) {
      this.charset = checkNotNull(charset);
    }

    @Override
    public Writer openStream() throws IOException {

    }
  }

  /**
   * A char sink that encodes written characters with a charset and writes resulting bytes to this
   * byte sink.
   */
  private final class AsCharSink extends CharSink {

    private final Charset charset;

    private AsCharSink(Charset charset) {
      this.charset = checkNotNull(charset);
    }

    @Override
    public Writer openStream() throws IOException {

        Ordering<Integer> ord,
        Charset charset,
        TimeUnit unit,
        Class<?> cls,
        Joiner joiner,
        Pattern pattern,
        UnsignedInteger ui,
        UnsignedLong ul,
        StringBuilder sb,
        Predicate<?> pred,
        Function<?, ?> func,
        Object obj) {
      delegate.foo(
          s, r, n, it, b, eq, e, in, c, ord, charset, unit, cls, joiner, pattern, ui, ul, sb, pred,

    assertThat(request.method).isEqualTo("POST")
    assertThat(request.url.toString()).isEqualTo("http://example.com/")
    assertThat(body!!.contentType().toString()).isEqualTo(
      "application/x-www-form-urlencoded; charset=utf-8",
    )
    assertThat(bodyAsString(body)).isEqualTo("foo")
  }

  @Test
  fun dataPut() {
    val request = fromArgs("-d", "foo", "-X", "PUT", "http://example.com").createRequest()

            plusIsSpace = false,
            charset = charset,
          )
        values +=
          value.canonicalizeWithCharset(
            encodeSet = FORM_ENCODE_SET,
            // Plus is encoded as `%2B`, space is encoded as plus.
            plusIsSpace = false,
            charset = charset,
          )
      }

      fun addEncoded(
        name: String,

            - chunk_size
            - charset
            - status_code
            - media_type
            - body
            - background
            - raw_headers
            - render
            - init_headers
            - headers
            - set_cookie
            - delete_cookie

::: fastapi.responses.HTMLResponse
    options:
        members:
            - charset
            - status_code

    val body = text.toResponseBody("text/plain; charset=unknown".toMediaType())
    assertThat(body.string()).isEqualTo(text)
  }

  companion object {
    @JvmOverloads
    fun body(
      hex: String,
      charset: String? = null,
    ): ResponseBody {
      val mediaType = if (charset == null) null else "any/thing; charset=$charset".toMediaType()
      return hex.decodeHex().toResponseBody(mediaType)