Between an HTTP request and response lies a realm of decision and transformation under your command with `HttpInterceptors`. Add authentication headers, filter content, retry failed requests, react to errors, log traffic, control busy indicators, and just make stuff up. Interceptors are easy to write and test. They’re a good reason to polish your RxJS skills. After 20 minutes with me you’ll be in the room where it happens, just like Alexander Hamilton and Thomas Jefferson.