v3.8.0

293a39f fix compile error for 32bit os
d53a954 check the arguments like printf
e7f5ca1 fix bug: format number abnormal on some platform
b0bed67 Add some api
db85c13 Use SO_REUSEPORT
55a9b04 fix bug: response large(> 4294967295) file fail
0755e54 file: support range requests
805b158 Improve the file response performance
01bfeb6 OOP: Only expose APIs
2fd658c configure the docroot and index page globally.
1e20eca Fix bug: handle fail when multi requests sent at a time