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When trying to open subpages of certain websites the it leads to the ERR_CONNECTION_CLOSED browser error.
The error below will be seen on the WAD debug:
fmt:idxIDX name idx=31, content-type:text/html; charset=utf-8 enc_len=18,huf=1
fmt:idxIDX name idx=34, etag:"1vcfqr2" enc_len=8,huf=1
fmt:idxIDX name idx=45, link:[E]2024-05-08 13:09:08.783724 [p:3192][s:66843225] wad_h2_parse_hdrs :770 conn=0x7f1230e790c0, hearder parsing error <<<<<<
[V]2024-05-08 13:09:08.783733 [p:3192][s:66843225] wad_h2_strm_task_end :402 h2_strm(0x7f123163dbb8) is closing
The cause of the issue is that in rare cases, the HTTP header from the server is larger than the maximum HTTP2 header value length that the WAD supports.
To workaround the issue, enforce ALPN 1.1 in the SSL/SSH inspection profile.
config firewall ssl-ssh-profile
edit <profile>
set supported-alpn http1-1
next
end
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