websock server - Case 6.3.2 : Pass - 1 ms @ 2026-04-11T02:41:02.370Z
Case Description
Send invalid UTF-8 text message in fragments of 1 octet, resulting in frames ending on positions which are not code point ends.
MESSAGE:
cebae1bdb9cf83cebcceb5eda080656469746564
Case Expectation
The connection is failed immediately, since the payload is not valid UTF-8.
Case Outcome
Actual events match at least one expected.
Expected:
{'OK': []}
Observed:
[]
Case Closing Behavior
Connection was properly closed (OK)
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: lRFSq7AmdoIBPKtrL2ScsQ== Sec-WebSocket-Version: 13
HTTP/1.1 101 Switching Protocols Date: Sat, 11 Apr 2026 02:41:02 GMT Connection: Upgrade Upgrade: websocket Sec-Websocket-Accept: h4DFWkrr9cpPhffN5FDpB5B/FWo=
| Key | Value | Description |
| isServer | False | True, iff I (the fuzzer) am a server, and the peer is a client. |
| closedByMe | False | 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 | None | 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 |
| 166 | 1 | 166 |
| Total | 1 | 166 |
| Chop Size | Count | Octets |
| 6 | 1 | 6 |
| 7 | 20 | 140 |
| 244 | 1 | 244 |
| Total | 22 | 390 |
| Opcode | Count |
| Total | 0 |
| Opcode | Count |
| 0 | 20 |
| 1 | 1 |
| Total | 21 |
000 TX OCTETS: 474554202f777320485454502f312e310d0a557365722d4167656e743a204175746f6261686e5465737453756974652f3235
2e31302e312d302e31302e390d0a ...
001 RX OCTETS: 485454502f312e312031303120537769746368696e672050726f746f636f6c730d0a446174653a205361742c203131204170
7220323032362030323a34313a30 ...
002 TX FRAME : OPCODE=1, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=bb90b880, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xce
003 TX OCTETS: 0181bb90b88075
004 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=be2ac96c, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xba
005 TX OCTETS: 0081be2ac96c04
006 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=fb77e6fe, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xe1
007 TX OCTETS: 0081fb77e6fe1a
008 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=1f65d92b, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xbd
009 TX OCTETS: 00811f65d92ba2
010 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=3d2d2e70, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xb9
011 TX OCTETS: 00813d2d2e7084
012 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=ad6dfe1d, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xcf
013 TX OCTETS: 0081ad6dfe1d62
014 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=5b6f3a31, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x83
015 TX OCTETS: 00815b6f3a31d8
016 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=ee1a5bf9, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xce
017 TX OCTETS: 0081ee1a5bf920
018 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=23c79d54, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xbc
019 TX OCTETS: 008123c79d549f
020 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=bf760d79, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xce
021 TX OCTETS: 0081bf760d7971
022 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=4f5d836b, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xb5
023 TX OCTETS: 00814f5d836bfa
024 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=17a14bdf, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xed
025 TX OCTETS: 008117a14bdffa
026 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=e24f35df, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xa0
027 TX OCTETS: 0081e24f35df42
028 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=2d95841e, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x80
029 TX OCTETS: 00812d95841ead
030 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=5bcf3019, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
e
031 TX OCTETS: 00815bcf30193e
032 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=d60776d5, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
d
033 TX OCTETS: 0081d60776d5b2
034 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=f817458b, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
i
035 TX OCTETS: 0081f817458b91
036 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=ae055c0d, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
t
037 TX OCTETS: 0081ae055c0dda
038 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=fb1e9d18, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
e
039 TX OCTETS: 0081fb1e9d189e
040 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=0572df1c, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
d
041 TX OCTETS: 00810572df1c61
042 TX FRAME : OPCODE=0, FIN=True, RSV=0, PAYLOAD-LEN=0, MASK=b4ef6c60, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
043 TX OCTETS: 8080b4ef6c60
044 FAIL CONNECTION AFTER 1.000000 sec
045 TCP DROPPED BY PEER