For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

The State Of HTTP/2 With F5 LTM

Code is community submitted, community supported, and recognized as ‘Use At Your Own Risk’. In this article, I will attempt to summarize the known challenges of an HTTP/2 full proxy setup, point ou...
Updated Nov 11, 2025
Version 2.0
application delivery
Juergen_Mang's avatar
Juergen_Mang
Icon for MVP rankMVP
Dec 09, 2025

Hi Sven,

I discovered this Bug already in the combination with the ASM::unblock in iRules.

The known issues list is terrifying long...

svs's avatar
svs
Icon for Cirrostratus rankCirrostratus
Dec 09, 2025

Ah...sorry. I've overseen this reference. But at least I found it outside of iRules. 😄

However, I hardly ever see F5 LTM setups with HTTP/2 full proxy configured.

Maybe because of the terrifying long list of known issues or bad experience 😉. I've never had good results with HTTP/2, neither measurable nor felt. Either because of buggy HTTP/2 configuration in the backend or because of the perceived lack of support on the BIG-IP or known issues...

  • Juergen_Mang's avatar
    Juergen_Mang
    Icon for MVP rankMVP
    Dec 10, 2025

    Ah...sorry. I've overseen this reference. But at least I found it outside of iRules.

    This makes it even worse.

    I hope this article will encourage F5 to prioritize addressing the issues with HTTP/2. In any case, I would prefer to see the known issues list worked through rather than new features being introduced.