corrected body content length calculation which is now aware of utf8 characters
corrected body content length calculation which is now aware of utf8 characters

this might still be wrong when using a different charset than utf8 or plain characters

zer0infinity/CuteTestForCoastTest,zer0infinity/CuteTestForCoastTest,zer0infinity/CuteTestForCoastTest,zer0infinity/CuteTestForCoastTest,zer0infinity/CuteTestForCoastTest