Specter does not work with SSL certificate

I have Specter on a remote computer connected to a Bitcoind on a server via a regular http connection. It all works fine, but I would like to create an https connection. And it just doesn't seem to work.

Specifically, I am attempting to connect Specter with Bitcoind's JSON-RPC API via an NGINX reverse proxy server. The SSL certificate for NGINX was created with 4096 RSA keys, and it seems to work fine for other applications. If I attempt to connect to the reverse proxy with Firefox, for instance, I get the message "JSONRPC server handles only POST requests" indicating that Firefox is making a connection to Bitcoind via NGINX.

According to the log, the problem is that Specter cannot verify the certificate: ("(Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1125)'))"

How can I instruct Specter to trust the certificate? (I assumed it would have been just handled by the operating system certificate manager to which I have incorporated the certificate as a trusted root authority.)

Start by reproducing the HTTPS connection from Specter to the Bitcoind JSON-RPC API through the NGINX reverse proxy, then trace where certificate verification is configured. Check how the operating system trust store and any application-specific certificate settings are used. Done means Specter can connect through the proxy without the certificate verification error.

Written by the indexing model from the issue text.