Merge pull request #487 from yqz1016/dev

modify the notice respose for truncated
Merge pull request #489 from forumbyr/master

update init sql;
Update README.md
Update README.md
Update README.md
Update README.md
Merge pull request #491 from forumbyr/master

fix bug: shutdown server unexcepted.
add 501 response
edit comments
refactor add 501 response
Merge pull request #497 from yqz1016/dev

add 501 response
Merge pull request #25 from cnnic/dev

merge from cnnic