Enabling SSR in mount_gradio_app leads to "[SSL] record layer failure (_ssl.c:1000)"

[ErnstDinkelmann]

Describe the bug

When using mount_gradio_app(... , ssr_mode=True), the logs show "[SSL] record layer failure (_ssl.c:1000)" every so often as users interact with the UI. It does not seem to have any influence on the user experience at all though.
When ssr_mode=False, the log does not show that message.

Have you searched existing issues? 🔎

• I have searched and found no existing issues

Reproduction

import gradio as gr
from fastapi import FastAPI
import uvicorn

def buildit():
    with gr.Blocks() as gr_block:
            gr.Markdown(value="TEST")
    return gr_block

if __name__ == '__main__':
    app = FastAPI()

    gr_block = buildit()
    app = gr.mount_gradio_app(
        app, 
        blocks=gr_block, 
        path="/login-app",
        ssr_mode=True,
    )

    uvicorn.run(
        app, 
        port=8080, 
    )

Screenshot

No response

Logs

This is a systemd process and the logs below are from journalctl. I'm willing to retrieve other logs if needed.

Oct 02 09:48:31 ip-[redacted] systemd[1]: Started app_kb_ui.service - app_kb_ui webserver.
Oct 02 09:48:34 ip-[redacted] start-app_kb_ui.sh[1504866]: INFO:     Started server process [1504866]
Oct 02 09:48:34 ip-[redacted] start-app_kb_ui.sh[1504866]: INFO:     Waiting for application startup.
Oct 02 09:48:34 ip-[redacted] start-app_kb_ui.sh[1504866]: INFO:     Application startup complete.
Oct 02 09:48:34 ip-[redacted] start-app_kb_ui.sh[1504866]: INFO:     Uvicorn running on http://127.0.0.1:8080 (Press CTRL+C to quit)
Oct 02 09:48:36 ip-[redacted] start-app_kb_ui.sh[1504866]: new /login-app
Oct 02 09:48:36 ip-[redacted] start-app_kb_ui.sh[1504866]: [SSL] record layer failure (_ssl.c:1000)
Oct 02 09:48:36 ip-[redacted] start-app_kb_ui.sh[1504866]: INFO:     [ip dedacted]:0 - "GET /login-app/ HTTP/1.1" 200 OK

System Info

Gradio Environment Information:
------------------------------
Operating System: Linux
gradio version: 5.47.2
gradio_client version: 1.13.3

------------------------------------------------
gradio dependencies in your environment:

aiofiles: 23.2.1
anyio: 4.7.0
audioop-lts is not installed.
brotli: 1.1.0
fastapi: 0.115.6
ffmpy: 0.4.0
gradio-client: 1.13.3
groovy: 0.1.2
httpx: 0.28.1
huggingface-hub: 0.35.3
jinja2: 3.1.4
markupsafe: 2.1.5
numpy: 2.2.0
orjson: 3.10.12
packaging: 24.2
pandas: 2.2.3
pillow: 11.0.0
pydantic: 2.10.3
pydub: 0.25.1
python-multipart: 0.0.19
pyyaml: 6.0.2
ruff: 0.13.2
safehttpx: 0.1.6
semantic-version: 2.10.0
starlette: 0.41.3
tomlkit: 0.13.2
typer: 0.15.1
typing-extensions: 4.12.2
uvicorn: 0.32.1
mcp is not installed.
pydantic: 2.10.3
authlib: 1.3.0
itsdangerous: 2.2.0


gradio_client dependencies in your environment:

fsspec: 2024.10.0
httpx: 0.28.1
huggingface-hub: 0.35.3
packaging: 24.2
typing-extensions: 4.12.2
websockets: 14.1

Severity

I can work around it