HttpClient.newHttpClient()
            .send(HttpRequest.newBuilder()
            .version(HttpClient.Version.HTTP_2)
            .uri(URI.create("http://localhost:8070"))
            .GET()
            .build(), HttpResponse.BodyHandlers.ofString());


         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 47 45 54 20 2f 20 48 54 54 50 2f 31 2e 31 0d 0a |GET / HTTP/1.1..|
|00000010| 43 6f 6e 6e 65 63 74 69 6f 6e 3a 20 55 70 67 72 |Connection: Upgr|
|00000020| 61 64 65 2c 20 48 54 54 50 32 2d 53 65 74 74 69 |ade, HTTP2-Setti|
|00000030| 6e 67 73 0d 0a 43 6f 6e 74 65 6e 74 2d 4c 65 6e |ngs..Content-Len|
|00000040| 67 74 68 3a 20 30 0d 0a 48 6f 73 74 3a 20 6c 6f |gth: 0..Host: lo|
|00000050| 63 61 6c 68 6f 73 74 3a 38 30 37 30 0d 0a 48 54 |calhost:8070..HT|
|00000060| 54 50 32 2d 53 65 74 74 69 6e 67 73 3a 20 41 41 |TP2-Settings: AA|
|00000070| 45 41 41 45 41 41 41 41 49 41 41 41 41 42 41 41 |EAAEAAAAIAAAABAA|
|00000080| 4d 41 41 41 42 6b 41 41 51 42 41 41 41 41 41 41 |MAAABkAAQBAAAAAA|
|00000090| 55 41 41 45 41 41 0d 0a 55 70 67 72 61 64 65 3a |UAAEAA..Upgrade:|
|000000a0| 20 68 32 63 0d 0a 55 73 65 72 2d 41 67 65 6e 74 | h2c..User-Agent|
|000000b0| 3a 20 4a 61 76 61 2d 68 74 74 70 2d 63 6c 69 65 |: Java-http-clie|
|000000c0| 6e 74 2f 31 37 2e 30 2e 31 0d 0a 0d 0a          |nt/17.0.1....   |
+--------+-------------------------------------------------+----------------+




curl --http2-prior-knowledge localhost:8070

         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 50 52 49 20 2a 20 48 54 54 50 2f 32 2e 30 0d 0a |PRI * HTTP/2.0..|
|00000010| 0d 0a 53 4d 0d 0a 0d 0a 00 00 12 04 00 00 00 00 |..SM............|
|00000020| 00 00 03 00 00 00 64 00 04 40 00 00 00 00 02 00 |......d..@......|
|00000030| 00 00 00 00 00 04 08 00 00 00 00 00 3f ff 00 01 |............?...|
|00000040| 00 00 1e 01 05 00 00 00 01 82 84 86 41 8a a0 e4 |............A...|
|00000050| 1d 13 9d 09 b8 f0 1d 07 7a 88 25 b6 50 c3 ab b6 |........z.%.P...|
|00000060| f2 e0 53 03 2a 2f 2a                            |..S.*/*         |
+--------+-------------------------------------------------+----------------+