// attribute to the attribute value with its case preserved.
func ParseMediaType(v string) (mediatype string, params map[string]string, err error) {
	base, _, _ := strings.Cut(v, ";")
	mediatype = strings.TrimSpace(strings.ToLower(base))

	err = checkMediaTypeDisposition(mediatype)
	if err != nil {
		return "", nil, err
	}

	params = make(map[string]string)

import okio.Buffer
import okio.IOException
import okio.Source
import okio.Timeout
import okio.buffer

internal class UnreadableResponseBody(
  private val mediaType: MediaType?,
  private val contentLength: Long,
) : ResponseBody(), Source {
  override fun contentType() = mediaType

  override fun contentLength() = contentLength

  override fun source() = buffer()

  override fun read(
    sink: Buffer,
    byteCount: Long,