htmx-ext-sse connect to server failed on local development.

[zw963]

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:

<div hx-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