CirrusHello Dan.
Everything depends on the specific details of your implementation, but reading your description I'm sure you can do it mostly using only iRules.
HSSR Documentation
https://clouddocs.f5.com/api/irules/HTTP-Super-SIDEBAND-Requestor-Client-Handles-Redirects-Cookies-Chunked-Transfer-APM-Access-etc.html
A practical example of using it:
https://clouddocs.f5.com/api/irules/Query-LDAP-From-An-iRule-And-Or-Use-APM-With-Non-HTTP-Services.html
Base on the info above, you can check something in your incoming request and use HSSR to send the initial info to another VS.
KR,
Dario.
CirrusThanks Dario - We need to make some fairly complex calls including generating a signed JWT token before initiating the sideband connection, that JWT is then used to request an access token from API 1 - we then need to use that token to make a second sideband call to API 2 and use it to validate some of the header info from the initial HTTP request, hence me looking at using iLX! 😀 - I'm much more familiar with regular iRules so if the same could be achieved that way I'd be happier!
If anyone can shed any light on the iLX > Virtual server sideband methods I'd be appreciative.
Fallback position is to offload this work to a web service on an application server but that will add another tier of infrastructure to the process, so I'd like to try and explore the options of doing this on-box if we can.
Thanks,
Dan
Then I recommend you to use iRulesLX better.
Here you have a good example.
https://devcentral.f5.com/s/articles/irules-lx-sideband-connection-1162
Also, some doc of how to start with iRulesLX
https://devcentral.f5.com/s/articles/getting-started-with-irules-lx-introduction-conceptual-overview-20409
https://devcentral.f5.com/s/articles/introducing-irules-lx-19888
KR,
Dario.
EmployeeRegarding iRules LX sideband connection implementation, see also iRules LX Sideband Connection - Handling timeouts: It discusses techniques to avoid unpleasant ILX::call timeouts.
