My Vercel proxy don't work anymore : Error 403 - Host not permitted - Help

Hello,

Since yesterday, my production application no longer works.

I use Vercel's serverless functions as a proxy for my front-end requests to the TMDB API. This function adds the Bearer token to http headers so that users don't see my API token.

// Vercel serverless function to proxy TMDB API requests

import { createProxyMiddleware } from 'http-proxy-middleware';
import type { Request, Response } from 'express';

const apiProxy = createProxyMiddleware({
  target: process.env['TMDB_API_URL'],
  changeOrigin: true,
  pathRewrite: {
    '^/api': '',
  },
  onProxyReq: proxyReq => {
    proxyReq.setHeader(
      'Authorization',
      `Bearer ${process.env['TMDB_API_TOKEN']}`
    );
  },
});

export default async function (req: Request<any>, res: Response<any>) {
  return apiProxy(req, res, () => ({}));
}

Until yesterday, everything had been running smoothly for over 8 months.

Error logs returned by the proxy function :

[Proxy Response] {
  statusCode: 403,
  path: '/configuration',
  headers: {
    'content-type': 'text/plain',
    'transfer-encoding': 'chunked',
    connection: 'close',
    date: 'Wed, 20 Nov 2024 08:34:23 GMT',
    server: 'openresty',
    'content-encoding': 'gzip',
    vary: 'Accept-Encoding,accept-encoding, Origin',
    'x-cache': 'Error from cloudfront',
    via: '1.1 b09c8a20b29053a362f3c1085a0f8990.cloudfront.net (CloudFront)',
    'x-amz-cf-pop': 'MRS52-P5',
    'alt-svc': 'h3=":443"; ma=86400',
    'x-amz-cf-id': 'wuVqwl7l58qHOjPJgJOfAgVIy7IMNAVgCnvhFOui9-kgrlbTQO3L9Q=='
  }
}

There is a possibility that my Vercel host has been blocked ?

When i try to use TMDB API with postman or with an other proxy there is no problem.

Thanks for helping.