[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Cannot access an API hosted on Vercel from a HuggingFace Space 36 views · 0 likes · 1 post Philippe Bernard (@phbernard) · 2025-11-16 Hey :waving_hand: I have created a simple gradio app: https://huggingface.co/spaces/MCP-1st-Birthday/RealFaviconGenerator-MCP-Server This app is supposed to connect to RealFaviconGenerator API (hosted on Vercel) to analyze a favicon. When I start this app locally with `uv run app.py`, I can issue an analysis from the “Favicon analysis” tab. However, in the app running on HuggingFace (see link above), it doesn’t work. Instead, I get a timeout. I created two '“debug tools”, Ping website and Check domain, to investigate. Here are my findings: * On my machine, everything works: I can access RealFaviconGenerator API, access any website such as Amazon’s and resolve any domain such as Google’s. * On HuggingFace, everything works but HTTP access to RealFaviconGenerator: whenever I try to use RealFaviconGenerator API or access a page of RealFaviconGenerator, I get a timeout. The rest works: [realfavicongenerator.net](http://realfavicongenerator.net/) can be resolved as a domain, and I can access the homepages of Amazon, etc. At this point, I know the issue is when HuggingFace *and* Vercel are involved. I’m able to reproduce the issue with another website hosted on Vercel, which reinforce this hypothesis. The issue might be due to the WAF of Vercel. What I tried: * Add a rule to Vercel WAF to prevent check on routes starting with /api/v2/ * Disable WAF entirely To no avail: I still get the same timeouts. I wanted to whitelist IPs from HuggingFace, but I couldn’t find them. Although I’m confident the issue is due to the HF-Vercel interaction, I don’t know what’s wrong and I couldn’t find anything relevant online. Any though? PS: I posted the same issue on HF forum at https://discuss.huggingface.co/t/cannot-reach-an-api-hosted-on-vercel-from-a-huggingface-space/170520