[BUG] cannot complete WebSocket handshake: parse_via: bad char <1> on state 100

[yujb-come]

OpenSIPS version
opensips :2.4

Describe
When our system A establishes a websocket connection with opensips,
opensips fails to verify because the received connection information carries the <Via: 1.1 default.fqdn> header,and the wss handshake fails.

Relevant System Logs
opensips error log is as follows:

==================================================
Nov 15 23:08:00 [58] ERROR:core:parse_via: bad char <1> on state 100

Nov 15 23:08:00 [58] ERROR:core:parse_via: <1.1 default.fqdn

X-Forwarded-For: 10.1.1.1

Front-end-https: on

Nov 15 23:08:00 [58] ERROR:core:parse_via: via parse failed

Nov 15 23:08:00 [58] ERROR:core:get_hdr_field: bad via

Nov 15 23:08:00 [58] INFO:core:parse_headers: bad header field

Nov 15 23:08:00 [58] ERROR:proto_wss:ws_parse_req_handshake: cannot parse headers

Host: xxxx:8443

Connection: Upgrade

Pragma: no-cache

Cache-Control: no-cache

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Upgrade: websocket

Origin: https://xxx/

Sec-WebSocket-Version: 13

Accept-Encoding: gzip, deflate, br, zstd

Accept-Language: en-GB,en;q=0.9

Cookie: _ga=GA1.1.2080369201.1731xxx33; _ga_BC6KRKZDR1=GS1.1.1731681733.1.1.173xxx83215.60.0.0

Sec-WebSocket-Key: XoHK1r7h+nfqssssvQJiAg==

Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits

Sec-WebSocket-Protocol: sip

X-Client-Ip: 10.x.xx

X-Authenticated-User: xxx

X-Authenticated-Groups: NAP_ALL_ALLOWED

Via: 1.1 default.fqdn

X-Forwarded-For: 10.x.x.x

Front-end-https: on

Nov 15 23:08:00 [58] ERROR:proto_wss:wss_read_req: cannot complete WebSocket handshake

==================================================

Expected behavior
Websocket connection can successfully establish a connection even if Via is included in the header like “Via: 1.1 default.fqdn”

Confirming the opensips source code,
it is found that even in the websocket handshake stage,
the header verification is carried out according to the rules of SIP message Via. Is this reasonable?
(trace: ws_parse_req_handshake--> parse_headers -->get_hdr_field /parse_via)

Can the handshake failure in this case be avoided?

OS/environment information

• Operating System: centos8

Additional context
Note: The message headers from system A itself does not contain the Via header, it may be that the intermediate component of the network layer carries the Via header

[ChrisZhangJin]

HI i'm also expecting this issue to be checked by the opensips team. :)