Following is the error message come from Firefox (please check the screenshot)

Following is the response header (please check screenshot)

Following is the response content: (please check screenshot)

Following is the htmx tag:

<divhx-ext="sse"sse-connect="/me"sse-swap="message">    Contents of this box will be updated in real time    with every SSE message received from the chatroom.</div>

Any idea?

Thanks