socket: 0.140
vnc: 0.123
network: 0.121
device: 0.087
other: 0.079
PID: 0.071
performance: 0.059
semantic: 0.052
debug: 0.051
permissions: 0.049
graphic: 0.049
files: 0.048
boot: 0.036
KVM: 0.034
network: 0.631
vnc: 0.121
debug: 0.062
socket: 0.050
device: 0.026
files: 0.023
other: 0.021
PID: 0.020
semantic: 0.010
performance: 0.009
graphic: 0.009
boot: 0.006
permissions: 0.006
KVM: 0.005

Chardev websocket stops listening after first connection disconnects

Using qemu option:
 -chardev socket,id=websock0,websocket,port=13042,host=127.0.0.1,server,nowait -serial chardev:websock0

To have a websocket listening chardev. After the first connection disconnects (that does a full websocket handshake), subsequent connections aren't accepted. See below for a reproducing session kindly provided by Daniel:

$ telnet localhost 13042
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: localhost:%s
Origin: http://localhost
Sec-WebSocket-Key: o9JHNiS3/0/0zYE1wa3yIw==
Sec-WebSocket-Version: 13
Sec-WebSocket-Protocol: binary

HTTP/1.1 101 Switching Protocols
Server: QEMU VNC
Date: Wed, 20 Feb 2019 16:52:04 GMT
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: b3DnPh7O8hyYE5sIjQxl/c1J+S8=
Sec-WebSocket-Protocol: binary

sfsd
�&�only binary frames may be fragmentedConnection closed by foreign host.

$ telnet localhost 13042
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.1
Upgrade: websocket
Connection: Upgrade
Host: localhost:%s
Origin: http://localhost
Sec-WebSocket-Key: o9JHNiS3/0/0zYE1wa3yIw==
Sec-WebSocket-Version: 13
Sec-WebSocket-Protocol: binary



...no response.....

Patch proposed

https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg05556.html

I can confirm that this patch fixes the issue. I can now reconnect after a client has disconnected.

https://git.qemu.org/?p=qemu.git;a=commitdiff;h=dd154c4d9f48a44ad24e1