Nginx 502 Bad Gateway and SSL_ERROR_RX_RECORD_TOO_LONG errors in Plesk

I have problem with my Node.js app on hosting in Plesk.

After I run app I got error "TypeError: NetworkError when attempting to fetch resource." when fetch data to https://example.com:3000/abc.

So I opened link https://example.com:3000 in browser, nothing happend. Port 3000 was found to be down. So we started port 3000 and added him to firewall.

I opened link https://example.com:3000 in browser again and got:

"Secure connection error - An error occurred while connecting to example.com:3000. A record exceeding the maximum allowed length was received during SSL communication. - Error code: SSL_ERROR_RX_RECORD_TOO_LONG"

With http link worked.

So I disabled proxy mode in Plesk and if I used this code:

location ~ / {proxy_set_header Host $host;proxy_set_header X-Real-IP $remote_addr;proxy_pass https://example.com:3000;}

I got "Server Error - 502 Bad Gateway" error from browser for link https://example.com:3000.

And Nginx gave me this error in logs:

2825143#0: *11563 SSL_do_handshake() failed (SSL: error:0A00010B:SSL routines::wrong version number) while SSL handshaking to upstream

And if I used this code:

location / {proxy_set_header X-Forwarded-For $remote_addr;proxy_set_header Host $http_host;proxy_pass http://127.0.0.1:3000;}

Link with http worked, but link https://example.com:3000/ got me error: "SSL_ERROR_RX_RECORD_TOO_LONG"

Any ideas?

Thank you.