HTTP headers are central to how the web works. They are used for passing additional information between the client and server, such as which security permissions to apply and information about the client, allowing the correct content to be served.
Today we are announcing the immediate availability of the second action within Transform Rules, “HTTP Request Header Modification”, available for all Cloudflare plans. This new functionality provides Cloudflare administrators with the ability to easily set or remove HTTP request headers as traffic flows through Cloudflare. This allows customers to enrich requests with information such as the Cloudflare Bot Management ‘Bot Score’ prior to being sent to their servers. Previously, HTTP request header modification was done using a Cloudflare Worker. Today we’re introducing an easier way to do this without writing a single line of code.
Generally, you don't need to know what those numbers and words mean. You just know they are important in getting your suitcase from the boarding desk, to the correct airplane, and back to the correct luggage carousel at your destination.