HTTP 501 when using web reverse-proxy (Cloudflare Argo Tunnel) to start VM - but stopping VM works?

I believe Cloudflare tunnel simply does this for performance reasons, and assumes the HTTP daemon can handle it.

Not sure the priority - but will the Proxmox HTTP daemon ever handle chunked transfer encoding in the future?
 
Hi I am a little late but I found a solution for my (similar) problem:

I enabled "Disable Chunked Encoding" under Cloudflare Zero Trust > Access > Tunnels > (my tunnel) > Public hostnames > (hostname for pve) > Additional Application Settings > HTTP Settings > Disable Chunked Encoding
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I hope this helps someone!
 

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