* See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.io.IOException
import okio.BufferedSink

open class ForwardingRequestBody(
  delegate: RequestBody?,
) : RequestBody() {
  private val delegate: RequestBody

  fun delegate(): RequestBody = delegate

  override fun contentType(): MediaType? = delegate.contentType()

  /** Returns a request that transforms `request` to be all uppercase.  */
  private fun uppercaseRequest(request: Request): Request {
    val uppercaseBody: RequestBody =
      object : ForwardingRequestBody(request.body) {
        @Throws(IOException::class)
        override fun writeTo(sink: BufferedSink) {
          delegate().writeTo(uppercaseSink(sink).buffer())
        }
      }
    return request

    )
    val sinkReference = AtomicReference<BufferedSink>()
    val response =
      getResponse(
        Request(
          url = server.url("/"),
          body =
            object : ForwardingRequestBody(transferKind.newRequestBody("def")) {
              override fun writeTo(sink: BufferedSink) {
                sinkReference.set(sink)
                super.writeTo(sink)
              }
            },