Apache Traffic Server - Slow Request

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We recently began noticing issues with our ATS when we added a new url to web application.  I've searched everywhere for information on how to understand the ATS diags.log but I haven't found anything that will help me decode these errors.  Nothing on the Apache site was too clear.  Has anyone experienced issues with Slow Requests from ATS.  Also

[Aug 13 21:05:56.242] Server {0x2b41ad211700} ERROR: [1746026] Slow Request: client_ip: 127.0.0.1:51987 url: api.mapbox.com:443/ status: 200 unique id:  bytes: 24092 fd: 0 client state: 0 server state: 0 ua_begin: 0.000 ua_read_header_done: 0.000 cache_open_read_begin: -1.000 cache_open_read_end: -1.000 dns_lookup_begin: 0.000 dns_lookup_end: 0.000 server_connect: 0.000 server_first_read: -1.000 server_read_header_done: -1.000 server_close: -1.000 ua_close: 30.859 sm_finish: 30.859
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Top Expert 2015
Commented:
Just increase backend timeout and look in backend logs why request took 30s until ATS aborted it.
btw Apache and Nginx both agree on 5min backend timeout in their defaults.
Top Expert 2015

Commented:
Thats the way it works

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