Adding CORS filter to allow Cross origin resource Sharing
Adding enhancement CORS
Move methods
Fix changelog
Merge branch 'master' into feature/CORS
Allow the user to override the request like in RateLimiter
Fix multiple headers management in Access-Control-Request-Headers
Allow the user to remove field by nulling it's value. Usefull for Access-Control-Max-Age
Remove static functions
Adding CORS documentation
Fix link
Move CORS documentation from REST to Structure
Fix unused var
concept-aliaese.md proofread.
Modyfied guide-zh-CN/concept-events.md content structure.
Guide-zh-CN/concept-behaviors.md content structure modified. works adjust. 1st proofread.
caching-overview.md proofread.
caching-data.md proofread.
Remove extra import and fix comment
Merge pull request #4311 from mickgeek/patch-2

Remove extra import and fix comment