A gist to create a cloudfront proxy for PostHog

posthog-cloudfront.ts

import * as cdk from "aws-cdk-lib";
import * as cloudfront from "aws-cdk-lib/aws-cloudfront";
import * as cloudfront_origins from "aws-cdk-lib/aws-cloudfront-origins";
import { Construct } from "constructs";

// created by PostHog user CJ Enright
// shared in our community slack https://posthogusers.slack.com/archives/CTLTM70RM/p1657732914776719
// many thanks to them 🙌💖 
export class PostHogProxy extends cdk.Stack {
	constructor(scope: Construct, id: string) {
		super(scope, id);

		const posthogPolicy = new cloudfront.OriginRequestPolicy(
			this,
			"PostHogProxyOriginRequestPolicy",
			{
				queryStringBehavior: cloudfront.OriginRequestQueryStringBehavior.all(),
				cookieBehavior: cloudfront.OriginRequestCookieBehavior.all(),
				// Note you can also define which headers to pass through here (defaults
				// to none), but passing all headers will NOT work:
				// https://posthogusers.slack.com/archives/C01GLBKHKQT/p1653998887155389?thread_ts=1653991286.292179&cid=C01GLBKHKQT
			},
		);

		new cloudfront.Distribution(this, "PostHogProxyDistribution", {
			defaultBehavior: {
				origin: new cloudfront_origins.HttpOrigin("app.posthog.com"),
				originRequestPolicy: posthogPolicy,
				allowedMethods: cloudfront.AllowedMethods.ALLOW_ALL,
			},
			priceClass: cloudfront.PriceClass.PRICE_CLASS_100,
		});
	}
}