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The issue is actually related to server side . there is some mod security on server that is not authenticating any call to server from app .
It seems like the https in your site is stripping the authorization code(a required parameter while making call to server) which is sent in headers .
Please check this source : https://GITHUB.COM/GESELLIX/KEEPASS-NODE/ISSUES/9
and these relevant links : https://STACKOVERFLOW.COM/QUESTIONS/26549250/APACHE-STRIPS-DOWN-AUTHORIZATION-HEADER
You need to allow access for authorization to stop stripping of the authorization code from headers .
Please contact your webhost on this .They would have to disable such mod security for this .