Updating Cache-Control header of a previously stored response when its value differs from a 304 response
Updating Date header of a previously stored response when its value differs from a 304 response
Updating Expires header of a previously stored response when its value differs from a 304 response
Small refactor in middleware specs
Updating Vary header of a previously stored response when its value differs from a 304 response
Refactored headers update routine during response validation
Refactored the middleware specs that check for headers update
Revert "Refactored the middleware specs that check for headers update"

This reverts commit 25258e5530a4a8dc3d4ca6460750a033d4b20d84.
Fixed middleware spec that checks if the 'Cache-Control' header is updated on response validation
Merge pull request #12 from erichmachado/master

Update HTTP headers of cached response on conditional GET