# and the test will fail.
        expected_headers = {
            'x-request-id': '34eeb41d-d267-9e49-8b84-dde403fc5b72',
            'x-b3-traceid': '80f198ee56343ba864fe8b2a57d3eff7',
            'x-b3-spanid': 'e457b5a2e4d86bd1',
            'x-b3-sampled': '1',
            'sw8': '40c7fdf104e3de67'
        }
        m.get("http://reviews:9080/reviews/%d" % product_id, text='{}',

 * prefix. Entries are sorted by their complete code points.
 *
 * The 4 bytes are named b0, b1, b2 and b3. We also define these supplemental values:
 *
 *  * **b2a**: b2 + 0x80
 *  * **b3a**: b3 + 0x80
 *  * **b2b3**: (b2 << 7) + b3
 *
 * b0
 * --
 *
 * The inclusive start of the range. We get the first 14 bits of this code point from the section

	b2 := namedComponent{b.Field("l2"), "b2"}
	b3 := namedComponent{b.Field("l3"), "b3"}
	b4 := namedComponent{b.Field("l4"), "b4"}

	// r0 = a0×b0 + 19×(a1×b4 + a2×b3 + a3×b2 + a4×b1)
	r0 := uint128{"r0", GP64(), GP64()}
	mul64(r0, 1, a0, b0)
	addMul64(r0, 19, a1, b4)
	addMul64(r0, 19, a2, b3)
	addMul64(r0, 19, a3, b2)
	addMul64(r0, 19, a4, b1)

	// r1 = a0×b1 + a1×b0 + 19×(a2×b4 + a3×b3 + a4×b2)

00000210  4f 03 d1 2d 90 8e 3f 4b  19 32 2a d6 ba b3 9f b2  |O..-..?K.2*.....|
00000220  ce 77 47 35 0c 5e e5 ea  64 bb 52 79 01 84 4b ee  |.wG5.^..d.Ry..K.|
00000230  b6 4f 0a bc 2f aa af f9  c4 d7 1b 8e c7 58 f1 dc  |.O../........X..|
00000240  84 57 f4 9c 3f 40 e5 27  49 9c 4c a9 98 1b 9a b3  |.W..?@.'I.L.....|
00000250  95 83 7e 32 b7 d8 25 85  4d bf fd 14 88 c0 f7 1c  |..~2..%.M.......|

      # Stackdriver Istio configurations.
      'grpc-trace-bin',

      # b3 trace headers. Compatible with Zipkin, OpenCensusAgent, and
      # Stackdriver Istio configurations.
      'x-b3-traceid',
      'x-b3-spanid',
      'x-b3-parentspanid',
      'x-b3-sampled',
      'x-b3-flags',

      # SkyWalking trace headers.
      'sw8',

000000a0  bb 17 03 03 00 42 02 e5  db dc 80 e1 c2 6f 31 1c  |.....B.......o1.|
000000b0  33 7b 76 8f 51 9c f8 a8  b0 1b 1a 8a 46 00 c7 ff  |3{v.Q.......F...|
000000c0  ff 4c c9 d8 28 14 32 74  ee 59 b3 15 4b 45 90 b6  |.L..(.2t.Y..KE..|
000000d0  da 56 b3 ef d4 6f 8a eb  96 b9 94 ab b9 9e b1 2e  |.V...o..........|
000000e0  fe 29 f2 0d 0d 93 66 1a  17 03 03 02 6d 84 4e 43  |.)....f.....m.NC|

00000340  dd 05 06 2c c4 57 dd fc  22 3a 2e 80 f9 84 6a ee  |...,.W..":....j.|
00000350  f2 a1 21 d1 0f db 17 50  a1 35 94 b3 0a b7 62 ca  |..!....P.5....b.|
00000360  2c b3 0b 68 0c 58 d7 24  83 82 d8 34 64 3f a4 61  |,..h.X.$...4d?.a|
00000370  0e b1 ca 93 67 b3 51 11  dc 49 f2 df 26 89 8b ea  |....g.Q..I..&...|
00000380  22 09 1a be 62 27 61 c8  93 4b dd 95 31 6a ba e2  |"...b'a..K..1j..|

00000150  cd 28 05 1c ea 28 8d 63  a3 41 e2 3a 24 27 f4 43  |.(...(.c.A.:$'.C|
00000160  97 c8 89 09 ed 8b 96 74  b3 dc 98 f4 0c c2 6f 25  |.......t......o%|
00000170  fc 30 8a f8 25 49 e1 91  fb c6 39 23 ca d5 16 08  |.0..%I....9#....|
00000180  5f bf 10 88 71 a4 c5 ac  e7 ad 9e 5a 4d e8 d3 1f  |_...q......ZM...|
00000190  f0 5d 83 9d c9 e2 b3 f8  e4 a3 a5 57 5d ca 30 74  |.].........W].0t|

00000340  fb 93 1f a6 7a 86 3c 5e  88 e5 75 d4 a1 73 4a b3  |....z.<^..u..sJ.|
00000350  0b 99 f1 a6 98 5f 6d 0f  00 0e 4f fa a3 5e 7d f0  |....._m...O..^}.|
00000360  41 dd dd 5c 71 3b 10 f9  75 07 d5 6c f2 83 83 5c  |A..\q;..u..l...\|
00000370  60 32 d9 d2 b3 13 1b 6c  84 2b 02 58 da b6 18 4e  |`2.....l.+.X...N|
00000380  ea 7d b3 46 2b a9 ec e7  65 3a 8e 2f 77 48 92 72  |.}.F+...e:./wH.r|

00000330  1a 69 33 a6 ad c6 1f ab  08 12 31 b4 c7 41 ac c5  |.i3.......1..A..|
00000340  b3 e5 4b 84 56 d9 0c 53  58 4c 8f 40 3a 34 66 d0  |..K.V..SXL.@:4f.|
00000350  c7 8f 9b b3 26 25 1f 68  fc 97 ba a7 de ac cf c5  |....&%.h........|
00000360  8b b3 26 99 68 6e ca e9  65 47 07 bd 38 15 f3 0c  |..&.hn..eG..8...|
00000370  d0 14 8e 6d 89 a2 ad cd  ad ef 00 54 07 5a 4b ef  |...m.......T.ZK.|