Hi @StephanH ,
Thanks for the response! In the short term, I’ve found that both dCache and EOS will support embedding the macaroon in the URL, so the urgency is somewhat reduced. However it would still be very useful to have a header-setting functionality for HTTP access since we might need to interact with other stores with similar behavior. For sure curl supports setting arbitrary headers so some interface to this capability in the curl backend would be extremely useful.
Best,
Peter