change check logic in /auth and /file/upload/:id and remove download button
backend: add some try and catch mechnism and log error when they happen,frontend: remove download button and change some message content
add logg in/n  /auth
change logrouting way and get ajax
test another routing way and get ajax
add some log
try objectId.createFromHexString
set acceptedFiles to application/pdf in uploadFile.js and try to add unique index in collectionName.files in server.js
test add unique index and try to set the index
test refinemenement
test refinement
fix api error
fix cb error
put fileId into registerData collection and use tokenId query fileId in that collection
change createIndex to ensureIndex
fix some bugs in /file/upload