Using Vercel rewrites as a reverse proxy

Last updated: Jun 29, 2023

Vercel supports rewrites which we can use as a reverse proxy. Create a vercel.json file and add a rewrites object from the /ingest route to https://app.posthog.com or https://eu.posthog.com.

JSON

{
  "rewrites": [
    {
      "source": "/ingest/:match*",
      "destination": "https://app.posthog.com/:match*"
    }
  ]
}

Once done, set the /ingest route of your domain as the API host in your PostHog initialization like this:

JavaScript

posthog.init('<ph_project_api_key>',
  {
    api_host: 'https://www.your-domain.com/ingest',
  }
)

Once updated, deploy your changes on Vercel and check that PostHog requests are going to https://www.your-domain.com/ingest by checking the network tab on your domain.

Setup video

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