websock server - Case 5.20 : Pass - 1002 ms @ 2026-04-11T02:40:35.721Z
Case Description
Same as Case 5.19, but send all frames with SYNC = True.
Note, this does not change the octets sent in any way, only how the stream
is chopped up on the wire.
Case Expectation
Same as Case 5.19. Implementations must be agnostic to how
octet stream is chopped up on wire (must be TCP clean).
Case Outcome
Actual events match at least one expected.
Expected:
{'OK': [('pong', u'pongme 1!'), ('pong', u'pongme 2!'), ('message', u'fragment1fragment2fragment3fragment4fragment5', False)]}
Observed:
[('pong', u'pongme 1!'), ('pong', u'pongme 2!'), ('message', u'fragment1fragment2fragment3fragment4fragment5', False)]
Case Closing Behavior
The spec requires the connection to be failed cleanly here (UNCLEAN)
GET /ws HTTP/1.1 User-Agent: AutobahnTestSuite/25.10.1-0.10.9 Host: 127.0.0.1:8888 Upgrade: WebSocket Connection: Upgrade Pragma: no-cache Cache-Control: no-cache Sec-WebSocket-Key: fHLcAaYDvEWnnozRRFycrQ== Sec-WebSocket-Version: 13
HTTP/1.1 101 Switching Protocols Date: Sat, 11 Apr 2026 02:40:35 GMT Connection: Upgrade Upgrade: websocket Sec-Websocket-Accept: IIPlS/xkQ+3EjxymQpkbc0Jsodo=
| Key | Value | Description |
| isServer | False | True, iff I (the fuzzer) am a server, and the peer is a client. |
| closedByMe | True | True, iff I have initiated closing handshake (that is, did send close first). |
| failedByMe | False | True, iff I have failed the WS connection (i.e. due to protocol error). Failing can be either by initiating closing handshake or brutal drop TCP. |
| droppedByMe | False | True, iff I dropped the TCP connection. |
| wasClean | False | True, iff full WebSocket closing handshake was performed (close frame sent and received) _and_ the server dropped the TCP (which is its responsibility). |
| wasNotCleanReason | peer dropped the TCP connection without previous WebSocket closing handshake | When wasClean == False, the reason what happened. |
| wasServerConnectionDropTimeout | False | When we are a client, and we expected the server to drop the TCP, but that didn't happen in time, this gets True. |
| wasOpenHandshakeTimeout | False | When performing the opening handshake, but the peer did not finish in time, this gets True. |
| wasCloseHandshakeTimeout | False | When we initiated a closing handshake, but the peer did not respond in time, this gets True. |
| localCloseCode | 1000 | The close code I sent in close frame (if any). |
| localCloseReason | None | The close reason I sent in close frame (if any). |
| remoteCloseCode | None | The close code the peer sent me in close frame (if any). |
| remoteCloseReason | None | The close reason the peer sent me in close frame (if any). |
| Chop Size | Count | Octets |
| 11 | 1 | 11 |
| 58 | 1 | 58 |
| 166 | 1 | 166 |
| Total | 3 | 235 |
| Chop Size | Count | Octets |
| 8 | 1 | 8 |
| 15 | 7 | 105 |
| 244 | 1 | 244 |
| Total | 9 | 357 |
| Opcode | Count |
| 1 | 1 |
| 10 | 2 |
| Total | 3 |
| Opcode | Count |
| 0 | 4 |
| 1 | 1 |
| 8 | 1 |
| 9 | 2 |
| Total | 8 |
000 TX OCTETS: 474554202f777320485454502f312e310d0a557365722d4167656e743a204175746f6261686e5465737453756974652f3235
2e31302e312d302e31302e390d0a ...
001 RX OCTETS: 485454502f312e312031303120537769746368696e672050726f746f636f6c730d0a446174653a205361742c203131204170
7220323032362030323a34303a33 ...
002 TX FRAME : OPCODE=1, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=0948d4c1, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
fragment1
003 TX OCTETS: 01890948d4c16f3ab5a6642dbab538
004 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=d7c327c2, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
fragment2
005 TX FRAME : OPCODE=9, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=cf8c9742, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
pongme 1!
006 DELAY 1.000000 sec for TAG None
007 TX OCTETS: 0089d7c327c2b1b146a5baa649b6e5
008 TX OCTETS: 8989cf8c9742bfe3f925a2e9b773ee
009 RX OCTETS: 8a09706f6e676d65203121
010 RX FRAME : OPCODE=10, FIN=True, RSV=0, PAYLOAD-LEN=9, MASKED=False, MASK=None
pongme 1!
011 DELAY TIMEOUT on TAG None
012 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=471e02df, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
fragment3
013 TX OCTETS: 0089471e02df216c63b82a7b6cab74
014 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=cdf0a608, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
fragment4
015 TX FRAME : OPCODE=9, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=4d319a0d, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
pongme 2!
016 TX FRAME : OPCODE=0, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=127b80f4, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=True
fragment5
017 CLOSE CONNECTION AFTER 1.000000 sec
018 TX OCTETS: 0089cdf0a608ab82c76fa095c87cf9
019 TX OCTETS: 89894d319a0d3d5ef46a2054ba3f6c
020 TX OCTETS: 8089127b80f47409e1937f1eee8027
021 RX OCTETS: 8a09706f6e676d65203221812d667261676d656e7431667261676d656e7432667261676d656e7433667261676d656e743466
7261676d656e7435
022 RX FRAME : OPCODE=10, FIN=True, RSV=0, PAYLOAD-LEN=9, MASKED=False, MASK=None
pongme 2!
023 RX FRAME : OPCODE=1, FIN=True, RSV=0, PAYLOAD-LEN=45, MASKED=False, MASK=None
fragment1fragment2fragment3fragment4fragment5
024 TX FRAME : OPCODE=8, FIN=True, RSV=0, PAYLOAD-LEN=2, MASK=7b48685f, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x03e8
025 TX OCTETS: 88827b48685f78a0
026 TCP DROPPED BY PEER