Reverse Proxy Servers and Vercel

We do not recommend to place a reverse proxy server in front of your Vercel project because the Vercel's firewall will be affected in the following ways:

• Loss of traffic visibility: Vercel's edge network loses full visibility into the traffic, which reduces the effectiveness of the firewall in identifying suspicious activity.
• It is more difficult to accurately identify real end-user IP addresses.
• If the proxy undergoes a malicious attack, this can be forwarded to the connected Vercel project and cause usage spikes.

However, you may still need to use a reverse proxy server. For example, your organization has legacy web applications protected by a reverse proxy and mandates that your Vercel project also uses this reverse proxy.

In such a case, you want to ensure that Vercel's platform-wide firewall does not block this proxy server due to the reasons mentioned above.

To facilitate reverse proxy setup and keep you protected at the same time, Vercel uses the concept of verified proxies. They are a list of common CDN vendors that Vercel will recognize and support by default. Verified proxies are enabled by default for the providers in the list below. However, some providers may require additional configuration on your side, in which case you should contact Vercel's support for help with the additional configuration.

If the provider of your reverse proxy server is not on the list above or if you are running your own reverse proxy server such as Nginx on a cloud provider, please contact Vercel's support.