Loader: HTTP[s] endpoint concurrency limit load tester

To build:

make build

To run sample tests:

make run

To clean up:

make clean

The http endpoint has to be set as an environment variable named HTTP_ADDR.

The command line flags:

-rate: Integer value for the request rate (i.e. concurrent requests). 
    #Example: ./loader -rate=120

-duration: The duration of the load test: Ns, Nm, Nh (N is the rate, s-m-h are time units for second, minute, and hour).
    #Example: ./loader -rate=120 -duration=10m

-logfile: The log file name for a simple logging (currently logs time stamp and status code as that's what suffices for me!).
    #Example: ./loader -rate=120 -duration=10m -logfile=Rate120Duration10Minute.log