* body.
 *
 * ### The response body can be consumed only once.
 *
 * This class may be used to stream very large responses. For example, it is possible to use this
 * class to read a response that is larger than the entire memory allocated to the current process.
 * It can even stream a response larger than the total storage on the current device, which is a
 * common requirement for video streaming applications.
 *

  require(millis <= Integer.MAX_VALUE) { "$name too large" }
  require(millis != 0L || duration <= 0L) { "$name too small" }
  return millis.toInt()
}

internal fun checkDuration(
  name: String,
  duration: Duration,
): Int {
  check(!duration.isNegative()) { "$name < 0" }
  val millis = duration.inWholeMilliseconds
  require(millis <= Integer.MAX_VALUE) { "$name too large" }

* What test cases should it have? What could go wrong?
* How will it roughly be implemented? We'll happily provide code pointers to save you time.

We may ask you to answer these questions directly in the GitHub issue or (for large changes) in a shared Google Doc.

* It uses a "spooled" file:
    * A file stored in memory up to a maximum size limit, and after passing this limit it will be stored in disk.
* This means that it will work well for large files like images, videos, large binaries, etc. without consuming all the memory.
* You can get metadata from the uploaded file.

          sink.writeUtf8("def")
        } catch (e: InterruptedException) {
          throw InterruptedIOException()
        }
      }
    }
  }

  companion object {
    /** A large response body. Smaller bodies might successfully read after the socket is closed!  */
    private val BIG_ENOUGH_BODY = repeat('a', 64 * 1024)
  }

      .isEqualTo(bytes)
    assertThat(CertificateAdapters.extension.fromDer(bytes))
      .isEqualTo(extension)
  }

  /** Tags larger than 30 are a special case. */
  @Test fun `large tag`() {
    val bytes = "df83fb6800".decodeHex()

    val adapter = Adapters.NULL.withTag(tagClass = DerHeader.TAG_CLASS_PRIVATE, tag = 65_000L)
    assertThat(adapter.toDer(null)).isEqualTo(bytes)

    bytesIn.writeShort(0xff00) // == Indexed - Add idx = 127
    assertFailsWith<IOException> {
      hpackReader!!.readHeaders()
    }.also { expected ->
      assertThat(expected.message).isEqualTo("Header index too large 127")
    }
  }

  // Example taken from twitter/hpack DecoderTest.testInsidiousIndex
  @Test
  fun readIndexedHeaderFieldInsidiousIndex() {
    bytesIn.writeByte(0xff) // == Indexed - Add ==

    this.cancelMode = mode.first
    this.connectionType = mode.second

    if (connectionType == H2) {
      platform.assumeHttp2Support()
    }

    // Sockets on some platforms can have large buffers that mean writes do not block when
    // required. These socket factories explicitly set the buffer sizes on sockets created.
    server = MockWebServer()
    server.serverSocketFactory =

        } else {
          val dynamicTableIndex = dynamicTableIndex(index - STATIC_HEADER_TABLE.size)
          if (dynamicTableIndex < 0 || dynamicTableIndex >= dynamicTable.size) {
            throw IOException("Header index too large ${index + 1}")
          }
          headerList += dynamicTable[dynamicTableIndex]!!
        }
      }

      // referencedHeaders is relative to nextHeaderIndex + 1.

  return try {
    toLong()
  } catch (_: NumberFormatException) {
    defaultValue
  }
}

/**
 * Returns this as a non-negative integer, or 0 if it is negative, or [Int.MAX_VALUE] if it is too
 * large, or [defaultValue] if it cannot be parsed.
 */
internal fun String?.toNonNegativeInt(defaultValue: Int): Int {
  try {
    val value = this?.toLong() ?: return defaultValue
    return when {