Added "400/Bad Request" unit test.
Added "400/Bad Request" unit test.

cauchycui/webdis,nicolasff/webdis,boothj5/webdis,boothj5/webdis,mrkeng/webdis,cauchycui/webdis,boothj5/webdis,mrkeng/webdis,nicolasff/webdis,nicolasff/webdis,nicolasff/webdis,mrkeng/webdis,mrkeng/webdis,cauchycui/webdis,nicolasff/webdis,cauchycui/webdis,boothj5/webdis