[PATCH] Improve application of the default ttl by response status, code

[Nils Goroll]

Ref: https://tools.ietf.org/html/rfc7231#section-6.1

Changes:

* 302 Found
* 307 Temporary Redirect

  Do not apply the default ttl, only set a ttl if Cache-Control or Expires are
present.
  Responses with these status codes are not cacheable by default

* 414 Request-URI Too Large

  Cacheable with "heuristic expiration"
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