gistfile1.txt

user=> (use 'ring.adapter.jetty)
2016-04-07 19:50:19.345:INFO::nREPL-worker-1: Logging initialized @65186ms
nil
user=> (require 'hello-ring.core)
nil
user=> (run-jetty handler {:port 3000})

CompilerException java.lang.RuntimeException: Unable to resolve symbol: handler in this context, compiling:(C:\Users\clush\AppData\Local\Temp\form-init1236118457988782170.clj:1:1)

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(ns hello-ring.core)

(defn handler [request]
  {:status 200
   :headers {"Content-Type" "text/html"}
   :body "Hello World"})

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filepath to the above
path/hello-ring/src/hello-ring