The term "headless" means that "I have access to NIFI server through REST API only!" Anyways, I used below curl to get root level process group: curl --location 'https://localhost:8443/nifi-api/process-groups/root' \ --header 'Authorization: Bearer eyJraWQiOiI1NGU4ZWRkNi00ZTY1LTQ3MmUtYTI5Ni1mNmI3MDJjZDYzNWEiLCJhbGciOiJQUzUxMiJ9.eyJzdWIiOiJkZWVwYWtkb2 I am closing this thread ... View more

Thanks @MattWho for the quick response. The short version of "why does it doesn't work" means is that nifi keeps working, recognizes the addition of the NARs but no "1.24" versions of components are available in the Processor selection window. I promptly tried the "M1" download workaround and found this as soon as I wget'ed the NAR: text version of the above:   INFO Found ./extensions/nifi-standard-shared-nar-2.0.0-M1.nar in auto-load directory INFO Starting load process for 1 NARs... INFO Creating class loaders for 1 NARs... WARN Unable to resolve required dependency 'nifi-standard-services-api-nar'. Skipping NAR '/usr/local/lib/nifi-2.0.0-M2/./work/nar/extensions/nifi-standard-shared-nar-2.0.0-M1.nar-unpacked' INFO Successfully created class loaders for 0 NARs, 1 were skipped INFO Finished NAR loading process!   so, since it asks for nifi-standard-shared, I'll download it also and: text version:   INFO Found ./extensions/nifi-standard-services-api-nar-2.0.0-M1.nar in auto-load directory INFO Starting load process for 1 NARs... INFO Including 1 previously skipped bundle(s) INFO Creating class loaders for 2 NARs... WARN While loading 'org.apache.nifi:nifi-standard-services-api-nar:2.0.0-M1' unable to locate exact NAR dependency 'org.apache.nifi:nifi-jetty-bundle:2.0.0-M1'. Only found one possible match 'org.apache.nifi:nifi-jetty-bundle:2.0.0-M2'. Continuing... INFO Loaded NAR file: /usr/local/lib/nifi-2.0.0-M2/./work/nar/extensions/nifi-standard-services-api-nar-2.0.0-M1.nar-unpacked as class loader org.apache.nifi.nar.NarClassLoader[./work/nar/extensions/nifi-standard-services-api-nar-2.0.0-M1.nar-unpacked] INFO Loaded NAR file: /usr/local/lib/nifi-2.0.0-M2/./work/nar/extensions/nifi-standard-shared-nar-2.0.0-M1.nar-unpacked as class loader org.apache.nifi.nar.NarClassLoader[./work/nar/extensions/nifi-standard-shared-nar-2.0.0-M1.nar-unpacked] INFO Successfully created class loaders for 2 NARs, 0 were skipped     EDIT: I also downloaded the jetty package, but: INFO Starting load process for 1 NARs... ERROR Found a Jetty NAR, will not auto-load /usr/local/lib/nifi-2.0.0-M2/./extensions/nifi-jetty-bundle-2.0.0-M1.nar INFO No NARs were unpacked, nothing to do   so, it looks like it's acknowledging the NARs I provide, but after reloading the interface: You've been very helpful (and quick) providing the causes and several workarounds (I'll go the "build your URL on the fly" way), so thank you a lot and my double "accept as solution" click 🙂 ... View more