installing backstop

Hi
I've attempted to install backstop into an Ubuntu 15 vm where I have Graphite also installed. I followed the steps with the following settings:

$ cd /tmp/
git clone https://github.com/obfuscurity/backstop.git
$ cd backstop
$ bundle install
$ export CARBON_URLS= "carbon://localhost:2003"
$ export PREFIXES= test,system_io_by_size,system_totals
$ foreman start

All works as expected so far. How ever when I try to formulate a rest post command the example provided indicates backstop is listening on port 443, but I find no process that is running on this port. I found the process kicked off after foreman start is listening on port 5000 but rest commands to this port return this:

command I run from within my vm:
graphite@jeffs-ubuntu:~/backstop$ curl --data '{"metric" :"test" , "value" : "100", "measure_time" : "2016-07-01"}' http://localhost:5000/publish/note

error returned:

RuntimeError: missing PREFIXES
/home/graphite/backstop/lib/backstop/config.rb:4:in env!' /home/graphite/backstop/lib/backstop/config.rb:10:inprefixes'
/home/graphite/backstop/lib/backstop/web.rb:97:in block in <class:Application>' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1611:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1611:in block in compile!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:in[]'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:in block (3 levels) in route!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:994:inroute_eval'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/sinatra.rb:139:in route_eval_with_newrelic' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:975:inblock (2 levels) in route!'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1015:in block in process_route' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1013:incatch'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1013:in process_route' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/sinatra.rb:119:inprocess_route_with_newrelic'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:973:in block in route!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:972:ineach'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:972:in route!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1085:inblock in dispatch!'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in block in invoke' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:incatch'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in invoke' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1082:indispatch!'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/sinatra.rb:164:in dispatch_and_notice_errors_with_newrelic' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/sinatra.rb:150:inblock in dispatch_with_newrelic'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/controller_instrumentation.rb:363:in perform_action_with_newrelic_trace' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/sinatra.rb:147:indispatch_with_newrelic'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:907:in block in call!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:inblock in invoke'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:in catch' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1067:ininvoke'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:907:in call!' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:895:incall'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/rack/agent_hooks.rb:30:in traced_call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/rack/browser_monitoring.rb:32:in traced_call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/xss_header.rb:18:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/path_traversal.rb:16:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/json_csrf.rb:18:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/base.rb:49:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-protection-1.5.3/lib/rack/protection/frame_options.rb:31:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/logger.rb:15:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:212:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/head.rb:13:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/show_exceptions.rb:25:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:182:in call' /var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:2013:in call' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1487:inblock in call'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1787:in synchronize' /var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1487:incall'
/var/lib/gems/2.1.0/gems/newrelic_rpm-3.16.0.318/lib/new_relic/agent/instrumentation/middleware_tracing.rb:96:in call' /var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/tempfile_reaper.rb:15:incall'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/lint.rb:49:in _call' /var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/lint.rb:37:incall'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/showexceptions.rb:24:in call' /var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/commonlogger.rb:33:incall'
/var/lib/gems/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:219:in call' /var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/chunked.rb:54:incall'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/content_length.rb:15:in call' /var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/connection.rb:86:inblock in pre_process'
/var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/connection.rb:84:in catch' /var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/connection.rb:84:inpre_process'
/var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/connection.rb:53:in process' /var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/connection.rb:39:inreceive_data'
/var/lib/gems/2.1.0/gems/eventmachine-1.2.0.1/lib/eventmachine.rb:194:in run_machine' /var/lib/gems/2.1.0/gems/eventmachine-1.2.0.1/lib/eventmachine.rb:194:inrun'
/var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/backends/base.rb:73:in start' /var/lib/gems/2.1.0/gems/thin-1.7.0/lib/thin/server.rb:162:instart'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/handler/thin.rb:19:in run' /var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/server.rb:286:instart'
/var/lib/gems/2.1.0/gems/rack-1.6.4/lib/rack/server.rb:147:in start' /var/lib/gems/2.1.0/gems/rack-1.6.4/bin/rackup:4:in<top (required)>'
/usr/local/bin/rackup:23:in load' /usr/local/bin/rackup:23:in

ENV:
graphite@jeffs-ubuntu:~/backstop$ echo $PREFIXES
test,system_io_by_size,system_totals

help a noob out?

Thanks in advance.

The report names lib/backstop/config.rb and lib/backstop/web.rb and reproduces the failure through foreman and curl on port 5000. Start by checking which environment foreman passes to the web process and compare it with the shell's PREFIXES value. Done means the documented REST request works with the stated setup, or the configuration limitation is documented.