Revert "Bug fix"

This reverts commit b1785fd0073758468bd76d298c49a4d4574ef144.
Revert "Revert "Bug fix""

This reverts commit 84d11b8508cc830f0d29e6154f6512099b7f92f0.
Revert "Revert "Revert "Bug fix"""

This reverts commit 7ff6ff1163a40a3713ddc9940819c622d901da7d.
Change koa-body-parser module to koa-bodyparser