* may access this source.
   */
  var upstream: Source?,
  /** The number of bytes consumed from [upstream]. Guarded by this. */
  var upstreamPos: Long,
  /** User-supplied additional data persisted with the source data. */
  private val metadata: ByteString,
  /** The maximum size of [buffer]. */
  val bufferMaxSize: Long,
) {

    /**
     * The media-type multipart/form-data follows the rules of all multipart MIME data streams as
     * outlined in RFC 2046. In forms, there are a series of fields to be supplied by the user who
     * fills out the form. Each field has a name. Within a given form, the names are unique.
     */
    @JvmField
    val FORM = "multipart/form-data".toMediaType()

If the response issues an authorization challenge, OkHttp will ask the [`Authenticator`](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-authenticator/) (if one is configured) to satisfy the challenge. If the authenticator supplies a credential, the request is retried with that credential included.

## Retrying Requests

  private val maskCursor: Buffer.UnsafeCursor? = if (isClient) Buffer.UnsafeCursor() else null

  /** Send a ping with the supplied [payload]. */
  @Throws(IOException::class)
  fun writePing(payload: ByteString) {
    writeControlFrame(OPCODE_CONTROL_PING, payload)
  }

  /** Send a pong with the supplied [payload]. */
  @Throws(IOException::class)
  fun writePong(payload: ByteString) {

suita.osaka.jp sukagawa.fukushima.jp sukumo.kochi.jp sula.no suldal.no suli.hu sumida.tokyo.jp sumita.iwate.jp sumoto.hyogo.jp sumoto.kumamoto.jp sumy.ua sunagawa.hokkaido.jp sund.no sunndal.no sunnyday.jp supabase.co supabase.in supabase.net supersale.jp supplies supply support surf surgeonshall.museum surgery surnadal.no surrey.museum susaki.kochi.jp susono.shizuoka.jp suwa.nagano.jp suwalki.pl suzaka.nagano.jp suzu.ishikawa.jp suzuka.mie.jp suzuki sv sv.it svalbard.no sveio.no svelvik.no svizzera.museum...

studio

// study : 2014-12-11 Registry Services, LLC
study

// style : 2014-12-04 Binky Moon, LLC
style

// sucks : 2014-12-22 Vox Populi Registry Ltd.
sucks

// supplies : 2013-12-19 Binky Moon, LLC
supplies

// supply : 2013-12-19 Binky Moon, LLC
supply

// support : 2013-10-24 Binky Moon, LLC
support

// surf : 2014-01-09 Registry Services, LLC
surf

     */
    fun Response.varyHeaders(): Headers {
      // Use the request headers sent over the network, since that's what the response varies on.
      // Otherwise OkHttp-supplied headers like "Accept-Encoding: gzip" may be lost.
      val requestHeaders = networkResponse!!.request.headers
      val responseHeaders = headers
      return varyHeaders(requestHeaders, responseHeaders)
    }