in index.js,the contentDisposition is new RegExp(^Content-Disposition: *(form-data|inline|attachment)${BASIC_LATIN}*${EOL}, 'i'),
and BASIC_LATIN is '[\u0009\u0020-\u007E]';
only match english chars,but in non-english countries,it will has some other chars besides in ths range,so can you change contentDisposition to ;
^Content-Disposition: (form-data|inline|attachment).${EOL}