Spoolman Errno104

[crisp harness]

Hello, currently trying to get HA working with spoolman, but currently whenever I try to configure the integration I get Errno104 using the following host address "http://192.168.178.20:7912" any idea why? I can reach it on my browser without any issue.

Reference:
https://github.com/Donkie/Spoolman/

https://github.com/Disane87/spoolman-homeassistant

[sly ocean]

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[crisp harness]

Logs of my docker. While 192.168.178.84 is my HA OS and 202 is my Browser.

[crisp harness]

.