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Set up a simple reverse proxy

In this tutorial, you'll use Caddy to set up a reverse proxy to route data from Infura to your own node.

Prerequisites​

Steps​

1. Create a project directory​

Create a new directory for your project. You can do this from the command line:

mkdir reverseProxy

Change into the new directory:

cd reverseProxy

2. Install Caddy​

Install Caddy in the project directory using Homebrew:

brew install caddy

3. Create the reverse proxy​

To create the reverse proxy, create a text file named Caddyfile with the following content:

localhost

reverse_proxy https://mainnet.infura.io {
header_up Host
}

Ensure you replace <YOUR-API-KEY> with the API key for your Ethereum project.

In this example, the reverse proxy retrieves information from the Infura endpoint, and redirects it to localhost. Using header_up Host allows you to include your API key to both the Sepolia and localhost endpoints.

4. Run the reverse proxy​

In a new terminal window, from your project directory, run the reverse proxy using Caddy:

caddy run

5. Make a request​

In a new terminal window, make a curl request to localhost. The following example executes a web3_clientVersion request:

curl https://localhost/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "web3_clientVersion", "params": [], "id": 1}'

To ensure that the reverse proxy is working, execute the same request, replacing localhost with sepolia.infura.io. You should get the same result:

curl https://sepolia.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "web3_clientVersion", "params": [], "id": 1}'