mine does support SSE (https://github.com/mickael-kerjean/filestash) but it fails before getting there, with the log looking like this:
2025/09/11 01:16:13 HTTP 200 GET 0.1ms /.well-known/oauth-authorization-server
2025/09/11 01:16:13 HTTP 200 GET 2.5ms /
2025/09/11 01:16:14 HTTP 404 GET 0.2ms /favicon.svg
2025/09/11 01:16:14 HTTP 404 GET 0.2ms /favicon.png
2025/09/11 01:16:14 HTTP 200 GET 0.2ms /favicon.ico
2025/09/11 01:16:14 HTTP 200 GET 0.1ms /.well-known/oauth-authorization-server
2025/09/11 01:16:15 HTTP 201 POST 0.3ms /mcp/register
2025/09/11 01:16:27 HTTP 200 GET 1.4ms /
with the frontend showing: "Error creating connector" and the network call showing:
{ "detail": "1 validation error for RegisterOAuthClientResponse\n Input should be a valid dictionary or instance of RegisterOAuthClientResponse [type=model_type, input_value='{\"client_id\":\"ChatGPT.Dd...client_secret_basic\"}\\n', input_type=str]\n For further information visit https://errors.pydantic.dev/2.11/v/model_type" }