assertThat(expected.message)
        .isEqualTo("Client-sent frames must be masked.")
    }
  }

  @Test fun serverSentFramesMustNotBeMasked() {
    data.write("8180".decodeHex())
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->
      assertThat(expected.message)
        .isEqualTo("Server-sent frames must not be masked.")
    }
  }

	// lastStopStack is the stack trace at the point of the last
	// call to the stop method. This tends to be a more reliable way
	// of picking up stack traces, since the parser doesn't provide
	// a stack for every state transition event.
	lastStopStack trace.Stack

	// activeRanges is the set of all active ranges on the goroutine.
	activeRanges map[string]activeRange

// pprofMaxStack is the extent of the deduplication we're willing to do.
//
// Because slices aren't comparable and we want to leverage maps for deduplication,
// we have to choose a fixed constant upper bound on the amount of frames we want
// to support. In practice this is fine because there's a maximum depth to these
// stacks anyway.
const pprofMaxStack = 128

// stackMap is a map of trace.Stack to some value V.
type stackMap struct {

    frame.writeByte(FLAG_NONE)
    frame.writeInt(expectedStreamId and 0x7fffffff)
    frame.write(headerBlock, Http2.INITIAL_MAX_FRAME_SIZE.toLong())

    // Write the continuation frame, specifying no more frames are expected.
    writeMedium(frame, headerBlock.size.toInt())
    frame.writeByte(Http2.TYPE_CONTINUATION)
    frame.writeByte(FLAG_END_HEADERS)
    frame.writeInt(expectedStreamId and 0x7fffffff)

 *  Fix: MockWebServer explicitly closes sockets. (On some Android releases,
    closing the input stream and output stream of a socket is not sufficient.
 *  Fix: Buffer outgoing HTTP/2 frames to limit how many outgoing frames are
    created.
 *  Fix: Avoid crashing when cache writing fails due to a full disk.
 *  Fix: Improve caching of private responses.
 *  Fix: Update cache-by-default response codes.

        formatter.format(testDescriptor, [exception]) == """\
    java.lang.Exception: ouch

        Caused by:
        java.lang.RuntimeException: oops
"""
    }

    def "optionally shows stack traces"() {
        testLogging.getShowStackTraces() >> true
        testLogging.getStackTraceFilters() >> EnumSet.noneOf(TestStackTraceFilter)
        def exception = new Exception("ouch")

	//
	// These throws do not include runtime frames, system goroutines, or
	// frame metadata.
	throwTypeUser

	// throwTypeRuntime is a throw due to a problem with Go itself.
	//
	// These throws include as much information as possible to aid in
	// debugging the runtime, including runtime frames, system goroutines,
	// and frame metadata.
	throwTypeRuntime
)

			return false
		}
	}
	return true
}

var frames = []string{
	"../testdata/video-001.gif",
	"../testdata/video-005.gray.gif",
}

func testEncodeAll(t *testing.T, go1Dot5Fields bool, useGlobalColorModel bool) {
	const width, height = 150, 103

	g0 := &GIF{
		Image:     make([]*image.Paletted, len(frames)),
		Delay:     make([]int, len(frames)),
		LoopCount: 5,
	}
	for i, f := range frames {

</p>
<p>
  Above the event trace for the first logical processor are
  traces for various runtime-internal events.

  The "GC" bar shows when the garbage collector is running, and in which stage.
  Garbage collection may temporarily affect all the logical processors
  and the other metrics.

  The "Network", "Timers", and "Syscalls" traces indicate events in
  the runtime that cause goroutines to wake up.
</p>
<p>

			delete(seenEdge, k)
		}
		var parent *Node
		// A residual edge goes over one or more nodes that were not kept.
		residual := false

		// Group the sample frames, based on a global map.
		// Count only the last two frames as a call edge. Frames higher up
		// the stack are unlikely to be repeated calls (e.g. runtime.main
		// calling main.main). So adding weights to call edges higher up