Using the hosted proxy
Hyra offers a free, fully hosted version of the proxy. This means you don't need to do anything special to get it to work.
The hosted version also benefits from a 'rotating IP address' style system, as we have many public addresses attached to our proxy servers and these are rotated on each request to avoid cross-contamination of clients ratelimits.
The hosted proxy is accessible at hooks.hyra.io.
To use the proxy, you simply change discord.com (or ptb.discord.com/canary.discord.com) to hooks.hyra.io in your Discord Webhook URL. This will automatically forward your request to the hosted proxy.
A further example
Was: https://discord.com/api/webhooks/1030302001/AisDPpdoAPpaPA
Now: https://hooks.hyra.io/api/webhooks/1030302001/AisDPpdoAPpaPA