Hi all,

I’m trying to replicate functionality from a previous load balancer in HAProxy, 
and the final sticking point seems to be the unique ID header.  I found the 
unique-id-header and unique-id-format commands, which are great, but what I 
want to do is only add a unique-id-header if there is not already one present.  
If there is one present, I do not want to add another one (which is what seems 
to be happening by default).

I’ve tried adding a conditional:

  acl unique_id_missing hdr_cnt(X-Unique-ID) eq 0
  unique-id-format %{+X}o\ %ci-%cp-%rt-%pid-%Ts%fp
  unique-id-header X-Unique-ID if unique_id_missing

But that does not seem to be working.  Should it?  If not, is there another way 
to go about this?

Thanks!
Scott

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