Not able to load the widget html with MCP server in python, checked with MCP inspector

[Sateesh-karagana]

I have aMCP server running in python
The server is running fine and i could test it with MCP inspector as suggested in the below doc

• https://developers.openai.com/apps-sdk/quickstart
• https://developers.openai.com/apps-sdk/build/mcp-server#structure-the-data-your-tool-returns

able to run the python server
I could see the resources and tools in the MCP inspector locally with the below
npx @modelcontextprotocol/inspector
I couldn't load the widget
Not sure if i am doing something wrong or something is missing, Could someone please help me out here to fix the issue.
I have aMCP server running in python
The server is running fine and i could test it with MCP inspector as suggested in the below doc

https://developers.openai.com/apps-sdk/quickstart
https://developers.openai.com/apps-sdk/build/mcp-server#structure-the-data-your-tool-returns
able to run the python server
I could see the resources and tools in the MCP inspector locally with the below
npx @modelcontextprotocol/inspector
I couldn't load the widget
Not sure if i am doing something wrong or something is missing, Could someone please help me out here to fix the issue.

---

The repo link is here and the steps to produce what i am trying to do
https://github.com/ecociel/mcp-app-python

Need to have these installation version

• Python 3.13.2
• fastmcp 2.13.1
• mcp 1.21.2

Run the server, it show something like below screenshot

• python server.py

Run the MCP inspector in another terminal

• npx @modelcontextprotocol/inspector

Go to the MCP inspector opened in the browser and click on tools, you can see something like below screenshot

• click on tools
• click on get_info tool below
• In the topic (right side), enter some string(oranges)
• click on Run Tool

it show you "Success" and the structured content but the widget (html i have provided in the repo) is not getting loaded.

When i try to load the widget like below, getting 404 Not found
curl "http://localhost:8000/mcp/resource/ui%3A//widget/info-widget.html"

[katia-openai]

Hi @Sateesh-karagana, are you testing this in Google Chrome with a local endpoint?
If so, please make sure you follow the instructions in the README to disable the local-network-access flag and let us know if you're still having issues.