websock server - Case 5.19 : Pass - 1002 ms @ 2026-04-11T02:41:00.346Z
Case Description
A fragmented text message is sent in multiple frames. After
sending the first 2 frames of the text message, a Ping is sent. Then we wait 1s,
then we send 2 more text fragments, another Ping and then the final text fragment.
Everything is legal.
Case Expectation
The peer immediately answers the first Ping before
it has received the last text message fragment. The peer pong's back the Ping's
payload exactly, and echo's the payload of the fragmented message back to us.
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: ktYkCLocWF5D98gbD+o6wA== Sec-WebSocket-Version: 13
HTTP/1.1 101 Switching Protocols Date: Sat, 11 Apr 2026 02:41:00 GMT Connection: Upgrade Upgrade: websocket Sec-Websocket-Accept: 6nQjA/vS3dyJreJyrFSIWoHsO4I=
| 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
7220323032362030323a34313a30 ...
002 TX FRAME : OPCODE=1, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=2fdb84cf, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
fragment1
003 TX OCTETS: 01892fdb84cf49a9e5a842beeabb1e
004 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=0594c843, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
fragment2
005 TX OCTETS: 00890594c84363e6a92468f1a63737
006 TX FRAME : OPCODE=9, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=a72111d3, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
pongme 1!
007 TX OCTETS: 8989a72111d3d74e7fb4ca4431e286
008 DELAY 1.000000 sec for TAG None
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=bdd81d84, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
fragment3
013 TX OCTETS: 0089bdd81d84dbaa7ce3d0bd73f08e
014 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=9, MASK=0af5f901, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
fragment4
015 TX OCTETS: 00890af5f9016c879866679097753e
016 TX FRAME : OPCODE=9, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=6e86e584, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
pongme 2!
017 TX OCTETS: 89896e86e5841ee98be303e3c5b64f
018 TX FRAME : OPCODE=0, FIN=True, RSV=0, PAYLOAD-LEN=9, MASK=0799abc5, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
fragment5
019 TX OCTETS: 80890799abc561ebcaa26afcc5b132
020 CLOSE CONNECTION AFTER 1.000000 sec
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=731a6edd, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x03e8
025 TX OCTETS: 8882731a6edd70f2
026 TCP DROPPED BY PEER