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...Like the standard http.ServeMux, mux.Router matches incoming requests against a list of registered routes and calls a handler for the route that matches the URL or other conditions. The main features are that it implements the http.Handler interface so it is compatible with the standard http.ServeMux, requests can be matched based on URL host, path, path prefix, schemes, header and query values, HTTP methods or using custom matchers, URL hosts, paths and query values can have variables with an optional regular expression. Also, registered URLs can be built, or "reversed", which helps maintaining references to resources, Routes can be used as subrouters: nested routes are only tested if the parent route matches. ...

Testing distributed systems under hard failures like network partitions and instance termination is critical, but it's also important we test them under less catastrophic conditions because this is what they most often experience. Comcast is a tool designed to simulate common network problems like latency, bandwidth restrictions, and dropped/reordered/corrupted packets. It works by wrapping up some system tools in a portable(ish) way. On BSD-derived systems such as OSX, we use tools like...