Remove faraday depedency

so that the fetcher may be used as a script without bundling things

Gemfile

@@ -2,6 +2,5 @@ source 'https://rubygems.org'
 
 ruby '2.2.2' if ENV.key?('DYNO')
 
-gem 'faraday'
 gem 'puma'
 gem 'sinatra'

Gemfile.lock

@@ -1,9 +1,6 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    faraday (0.9.1)
-      multipart-post (>= 1.2, < 3)
-    multipart-post (2.0.0)
     puma (2.13.4)
     rack (1.6.4)
     rack-protection (1.5.3)
@@ -18,7 +15,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  faraday
   puma
   sinatra
 

cpi_fetcher.rb

@@ -1,4 +1,5 @@
-require 'faraday'
+require 'uri'
+require 'net/http'
 require 'json'
 
 class CPIFetcher
@@ -6,16 +7,22 @@ class CPIFetcher
   attr_reader :cpi_series_url
 
   def initialize
-    @cpi_series_url = (ENV['CPI_SERIES_URL'] || DEFAULT_CPI_SERIES_URL)
+    @cpi_series_url = URI(ENV['CPI_SERIES_URL'] || DEFAULT_CPI_SERIES_URL)
   end
 
   def cpi
-    resp = JSON.parse(Faraday.get(cpi_series_url).body)
+    resp = fetch_raw_response
 
     return nil unless resp['Results']['series']
 
     resp['Results']['series'].first['data'].first['value']
   end
+
+  private
+
+  def fetch_raw_response
+    JSON.parse(Net::HTTP.get_response(cpi_series_url).body)
+  end
 end
 
 if $PROGRAM_NAME == __FILE__