Github user shinya1020 commented on the issue:
https://github.com/apache/trafficserver/pull/1067
In our production, some servers return multiple Cache-Control headers.
For example, if the following configurations are applied to apache httpd
```
Header always set Cache-Control "public"
ExpiresActive On
ExpiresDefault "access plus 1 days"
```
then the server returns the following headers.
```
Cache-Control: public
Cache-Control: max-age=86400
Expires: Tue, 04 Oct 2016 12:25:44 GMT
```
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