Version 7

version switch done & rewrite fix & 404 add
Revert "Version 7"

This reverts commit 7ca07bff1c647d969fdb759c5e5a7ab148482cf8.
Revert "Revert "Version 7""

This reverts commit 32c9ef6870325023aef357884f73c7391ec5f9d7.
Version 8

Add convention file which is used for 404 error