If a user attempts to download a video file or a large image through your proxy, Vercel will return a 502 Bad Gateway or FUNCTION_PAYLOAD_TOO_LARGE error.
Vercel functions have hard limits:
The library exposes an Express‑compatible API . You mount it on a route prefix (e.g., /proxy/ ), and then any URL appended to that prefix will be fetched, rewritten (to fix relative links, cookies, etc.), and streamed back to the client. All data is processed and relayed on the fly without unnecessary buffering, making it one of the faster web proxies available. node unblocker vercel
Create a new directory on your local machine and initialize a Node.js project.
Ensure node-unblocker is a dependency:
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Configure custom cache headers for static assets (images, CSS, JS) so Vercel's Edge Network can serve repeated requests directly without triggering a serverless function invocation. If a user attempts to download a video
file in the root directory to understand how to route traffic and build the application. vercel.json "index.js" "@vercel/node" "index.js" Use code with caution. Copied to clipboard 4. Deployment Steps You can deploy your project using the Vercel CLI or by connecting a GitHub repository Via Vercel CLI Install the CLI: npm install -g vercel vercel login and follow the prompts. in your project folder to deploy a preview, or vercel --prod for production. Via GitHub (Recommended) Push your code to a new repository. Go to your Vercel Dashboard "Add New Project" Import your repository and click 5. Testing the Proxy
: If you need WebSockets or a long-running process, consider platforms like Railway or Render , which support traditional "always-on" Node.js servers better than Vercel. All data is processed and relayed on the
git clone https://github.com/nfriedly/node-unblocker.git cd node-unblocker
: Incoming and outgoing request bodies are limited to 4.5 MB on the free tier. This makes the proxy unsuitable for large file uploads or heavy media streaming.
