when turn off config.proxy.hostdb, ts just reponse a 502 page.
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Key: TS-952
URL: https://issues.apache.org/jira/browse/TS-952
Project: Traffic Server
Issue Type: Bug
Components: DNS, HTTP
Affects Versions: 3.1.0
Environment: all.
Reporter: weijin
If turn config.proxy.hostdb off, ts does not do the dns query but just return a
502 page.
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