websock secure server - Case 6.2.3 : Pass - 3 ms @ 2026-03-07T18:27:41.183Z
Case Description
Send a valid UTF-8 text message in fragments of 1 octet, resulting in frames ending on positions which are not code point ends.
MESSAGE:
Hello-µ@ßöäüàá-UTF-8!!
48656c6c6f2dc2b540c39fc3b6c3a4c3bcc3a0c3a12d5554462d382121
Case Expectation
The message is echo'ed back to us.
Case Outcome
Actual events match at least one expected.
Expected:
{'OK': [('message', u'Hello-\xb5@\xdf\xf6\xe4\xfc\xe0\xe1-UTF-8!!', False)]}
Observed:
[('message', u'Hello-\xb5@\xdf\xf6\xe4\xfc\xe0\xe1-UTF-8!!', False)]
Case Closing Behavior
The spec requires the connection to be failed cleanly here (UNCLEAN)
GET /wss HTTP/1.1 User-Agent: AutobahnTestSuite/25.10.1-0.10.9 Host: 127.0.0.1:8889 Upgrade: WebSocket Connection: Upgrade Pragma: no-cache Cache-Control: no-cache Sec-WebSocket-Key: 4p7mxPgMEsqpsa2WfJ3RIA== Sec-WebSocket-Version: 13
HTTP/1.1 101 Switching Protocols Date: Sat, 07 Mar 2026 18:27:41 GMT Connection: Upgrade Upgrade: websocket Sec-Websocket-Accept: uXxfZz053EIJBEp/L8baEczh3rI=
| 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 |
| 31 | 1 | 31 |
| 166 | 1 | 166 |
| Total | 2 | 197 |
| Chop Size | Count | Octets |
| 6 | 1 | 6 |
| 7 | 29 | 203 |
| 8 | 1 | 8 |
| 245 | 1 | 245 |
| Total | 32 | 462 |
| Opcode | Count |
| 1 | 1 |
| Total | 1 |
| Opcode | Count |
| 0 | 29 |
| 1 | 1 |
| 8 | 1 |
| Total | 31 |
000 TX OCTETS: 474554202f77737320485454502f312e310d0a557365722d4167656e743a204175746f6261686e5465737453756974652f32
352e31302e312d302e31302e390d ...
001 RX OCTETS: 485454502f312e312031303120537769746368696e672050726f746f636f6c730d0a446174653a205361742c203037204d61
7220323032362031383a32373a34 ...
002 TX FRAME : OPCODE=1, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=4e9fc6b3, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
H
003 TX OCTETS: 01814e9fc6b306
004 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=980ed8b8, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
e
005 TX OCTETS: 0081980ed8b8fd
006 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=472d4b6e, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
l
007 TX OCTETS: 0081472d4b6e2b
008 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=4d7db6b6, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
l
009 TX OCTETS: 00814d7db6b621
010 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=68b39b5e, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
o
011 TX OCTETS: 008168b39b5e07
012 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=a71a14dd, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
-
013 TX OCTETS: 0081a71a14dd8a
014 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=94811ab9, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc2
015 TX OCTETS: 008194811ab956
016 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=e521b011, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xb5
017 TX OCTETS: 0081e521b01150
018 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=5814a9b9, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
@
019 TX OCTETS: 00815814a9b918
020 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=86773366, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
021 TX OCTETS: 00818677336645
022 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=50daaf6e, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x9f
023 TX OCTETS: 008150daaf6ecf
024 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=d0fc7ecf, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
025 TX OCTETS: 0081d0fc7ecf13
026 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=90e1c9da, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xb6
027 TX OCTETS: 008190e1c9da26
028 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=e1729465, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
029 TX OCTETS: 0081e172946522
030 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=240c6d31, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xa4
031 TX OCTETS: 0081240c6d3180
032 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=bec420ee, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
033 TX OCTETS: 0081bec420ee7d
034 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=c407be86, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xbc
035 TX OCTETS: 0081c407be8678
036 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=58600491, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
037 TX OCTETS: 0081586004919b
038 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=ad63b760, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xa0
039 TX OCTETS: 0081ad63b7600d
040 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=85185dfd, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xc3
041 TX OCTETS: 008185185dfd46
042 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=749183bd, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0xa1
043 TX OCTETS: 0081749183bdd5
044 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=68efc407, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
-
045 TX OCTETS: 008168efc40745
046 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=04b2cf77, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
U
047 TX OCTETS: 008104b2cf7751
048 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=bbdf1ec7, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
T
049 TX OCTETS: 0081bbdf1ec7ef
050 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=90412f72, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
F
051 TX OCTETS: 008190412f72d6
052 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=990c97a3, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
-
053 TX OCTETS: 0081990c97a3b4
054 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=265c3220, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
8
055 TX OCTETS: 0081265c32201e
056 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=a46b3e81, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
!
057 TX OCTETS: 0081a46b3e8185
058 TX FRAME : OPCODE=0, FIN=False, RSV=0, PAYLOAD-LEN=1, MASK=0876ec55, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
!
059 TX OCTETS: 00810876ec5529
060 TX FRAME : OPCODE=0, FIN=True, RSV=0, PAYLOAD-LEN=0, MASK=0a6b9029, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
061 TX OCTETS: 80800a6b9029
062 CLOSE CONNECTION AFTER 1.000000 sec
063 RX OCTETS: 811d48656c6c6f2dc2b540c39fc3b6c3a4c3bcc3a0c3a12d5554462d382121
064 RX FRAME : OPCODE=1, FIN=True, RSV=0, PAYLOAD-LEN=29, MASKED=False, MASK=None
Hello-µ@ßöäüàá-UTF-8!!
065 TX FRAME : OPCODE=8, FIN=True, RSV=0, PAYLOAD-LEN=2, MASK=2a9f5053, PAYLOAD-REPEAT-LEN=None, CHOPSIZE=None, SYNC=False
0x03e8
066 TX OCTETS: 88822a9f50532977
067 TCP DROPPED BY PEER