Menu after logging in

[thedyerman]

Menu is causing some type of timeout when first logging into LUCI interface.
Running commit b17ec09 but has been an issue for the last few.

Easily recreate it by logging out and back into interface (default or material theme), happens every time across multiple routers I have running (all MediaTek although I'm not sure that's relevant)

[rmilecki]

According to my bisecting & testing this issue is caused by the 5e9c23c6f40f ("client: allow keep-alive for POST requests").

I don't know much about keep-alive, it seems like some problem with uhttp's connection closing (or just letting client know about end of file?). Sometimes it hits the menu resource, another time fs.js.

[rmilecki]

Jo pointed out that above commit is quite old while LuCI was working fine few weeks ago. So there had to be some interference of at least two changes.

I keep bisecting and I noticed that uhttpd regression (described above) was exposed by my LuCI commit bc6e4df ("luci-base: use actual JSON-RPC for verifying ubus RPC URL"). It cannot be simply reverted as it will break LuCI due to the uhttpd change adding new API.

[olimpiumarius]