mitchell852 commented on pull request #5142:
URL: https://github.com/apache/trafficcontrol/pull/5142#issuecomment-708514641


   > Should we not always send `Last-Modified`? What's the reason not to?
   > The LM is used to request an `IMS`. If it's not sent initially, users will 
have to either have custom logic to use the Date the first time (which is less 
accurate), or make a fake IMS with 1900-01-01 or something.
   
   i think the idea was that if you set use_ims=true in cdn.conf, you'd get the 
last-modified header with all GET requests and if you set use_ims=false, you 
were not planning on using the last-modified header so just leave it out. 


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