Cloudflare Workers

The Confidence Cloudflare resolver enables feature flag evaluation at the edge using Cloudflare Workers. Built on the Confidence Resolver WebAssembly module, it evaluates flags as close to your users as possible. You can then use the Confidence SDKs to resolve from the Cloudflare resolver, either via service binding or regular calls from clients.

Features

Edge evaluation: Flag rules evaluate at Cloudflare’s edge locations worldwide
Ultra-low latency: Evaluation happens close to users, minimizing latency
WebAssembly powered: Rust-based resolver compiled to WASM for performance
Background sync: Flag rules sync with Confidence in the background

Deployment

The Cloudflare resolver is deployed using a Docker-based deployer that handles building and publishing the Worker to your Cloudflare account.

Prerequisites

Docker installed
Cloudflare API token with Workers permissions
Confidence client secret

Build the deployer

From the root of the confidence-resolver repository:

docker build --target confidence-cloudflare-resolver.deployer -t confidence-cloudflare-deployer .

Deploy to Cloudflare

Run the deployer with your credentials:

docker run -it \
    -e CLOUDFLARE_API_TOKEN='your-cloudflare-api-token' \
    -e CONFIDENCE_CLIENT_SECRET='your-confidence-client-secret' \
    confidence-cloudflare-deployer

The deployer automatically detects:

Cloudflare account ID from your API token
Resolver state from Confidence CDN
Existing deployment to avoid unnecessary re-deploys

Optional configuration

Variable	Description
`CLOUDFLARE_ACCOUNT_ID`	Required only if API token has access to multiple accounts
`CONFIDENCE_RESOLVER_STATE_URL`	Custom resolver state URL (overrides CDN)
`CONFIDENCE_RESOLVER_ALLOWED_ORIGIN`	Configure allowed origins for CORS
`FORCE_DEPLOY`	Force re-deploy regardless of state changes
`NO_DEPLOY`	Build only, skip deployment

Limitations

Sticky assignments: Not currently supported with the Cloudflare resolver. Flags with sticky assignment rules will return “flag not found”.

Resources

GitHub repository

Source code and deployment instructions