# 4.0.1

- merge pr #1177 #1196 #1205 #1224 #1225 #1227 #1256 #1263 #1291
- fix #1257

update doc

1. fix #877 'dio.interceptors.errorLock.lock()'

2. fix #851
3. fix #641

add test cases

Merge pull request #639 from Endebert/patch-1

fix(transformer): reduce memory consumption

Merge pull request #596 from HackrHIVE/patch-1

minor change in example (FormData)

revert #562, and fixed #566

merge #557 #531

Merge remote-tracking branch 'origin/master'

update doc