[rutmang]

Hello All,
I have performed an upgrade to 3.1.1 on an existing Ubuntu 16.04 server running calibre-server. Things look ok, and the reader works when I hit it locally by the IP address and the port.

But when I try to use it from Apache presenting it externally, the reader function throws an error:

Uncaught InvalidStateError: Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'blob').
Error at calibre:4819:32
Traceback (most recent call last):
    at XMLHttpRequest.ρσ_anonfunc (https://xxxxx.net/calibre:4894:21)
    at complete_callback (https://xxxxx.net/calibre:4863:21)
    at set_error (https://xxxxx.net/calibre:4819:32)
Error: Failed to read the 'responseText' property from 'XMLHttpRequest': The value is only accessible if the object's 'responseType' is '' or 'text' (was 'blob').

My calibre.service script:

[Unit]
Description=Calibre Service
After=network.target

[Service]
Type=forking
PIDFILE=/tmp/calibre-server.pid
ExecStart=/opt/calibre/calibre-server /media/usb1/media/calibrelibrary \
        --daemonize \
        --log=/var/log/calibre-server \
        --max-opds-items=30 \
        --max-opds-ungrouped-items=100 \
        --port=8088 \
        --pidfile=/tmp/calibre-server.pid \
        --url-prefix=/calibre
        --auth-mode=basic

[Install]
WantedBy=multi-user.target

The log is only showing:

calibre server listening on 0.0.0.0:8088
OPDS feeds advertised via BonJour at: 192.168.10.68 port: 8088

Externally, I can browse and download books from the webpage or through OPDS. When I try the Read button, it attempts the download sequence and then pops the error above.

I can only guess something with the new reader function doesn't like how I've had Apache set up for normal operation in the past. Any ideas would be helpful! Thank you!