jp557198 commented on pull request #7069:
URL: https://github.com/apache/trafficserver/pull/7069#issuecomment-668258578


   ATS 7.1.4
   
   As a fyi..  we ran into this problem during our edge peering lab testing. 
This was my observation:
   
   "Proxy cycle is occurring because the proxy is making a request to itself.. 
ATS code compares the server and client via string values.
   See the below traffic.out and corresponding code.
   Maybe we can try playing with the via string(proxy_request_via_string)"
   
   To 'fix' this issue, we simply set proxy_request_via_string to 0.  Once set, 
a child was able to peer to itself.
   
   Side note: Edge/Child peering is currently soaking in prod and has worked to 
significantly increase HIT rate, as well as lower storage 
requirements(content/library sharding)
   
   
   


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