Using Netlify redirects as a reverse proxy

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Warning

  1. The following self-hosted proxy isn't provided by PostHog, so we can't take responsibility for it! If unsure, we recommend using our managed reverse proxy.

  2. If you are using the EU cloud then use eu instead of us in all domains (e.g. us.i.posthog.com -> eu.i.posthog.com).

  3. Avoid using generic or common path names like /analytics, /tracking, /ingest, or /posthog for your reverse proxy. They will most likely be blocked. Instead, use a non-obvious path name or something random and unique to your application that's unlikely to appear in a filter list.

Netlify supports redirects and rewrites which we can use as a reverse proxy from a custom route. In your netlify.toml file, add a redirect like this:

JavaScript
[[redirects]]
  from = "/<ph_proxy_path>/static/*"
  to = "https://us-assets.i.posthog.com/static/:splat"
  host = "us-assets.i.posthog.com"
  status = 200
  force = true


[[redirects]]
  from = "/<ph_proxy_path>/*"
  to = "https://us.i.posthog.com/:splat"
  host = "us.i.posthog.com"
  status = 200
  force = true

Note: If deploying SvelteKit on Netlify use _redirects file and place it in the project root, as redirects in netlify.toml configuration are not supported.

JavaScript
/<ph_proxy_path>/static/*  https://us-assets.i.posthog.com/static/:splat  200!
/<ph_proxy_path>/*         https://us.i.posthog.com/:splat  200!

Note: This proxy configuration works with custom domains but may not work correctly with the default .netlify.app domain. If you're experiencing issues with PostHog requests being blocked, ensure you're using a custom domain rather than the default Netlify domain.

Once done, set the /<ph_proxy_path> 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/<ph_proxy_path>',
  ui_host: '<ph_app_host>',
  defaults: '2025-05-24',
})

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

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