diff --git a/Gemfile.lock b/Gemfile.lock
index eb498ea..2ebdf70 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,17 +10,33 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    coderay (1.1.2)
+    crack (0.4.3)
+      safe_yaml (~> 1.0.0)
     faraday (0.15.2)
       multipart-post (>= 1.2, < 3)
     faraday_middleware (0.12.2)
       faraday (>= 0.7.4, < 1.0)
+    hashdiff (0.3.7)
+    method_source (0.9.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     multipart-post (2.0.0)
     nitlink (1.1.0)
     nokogiri (1.8.3)
       mini_portile2 (~> 2.3.0)
+    pry (0.11.3)
+      coderay (~> 1.1.0)
+      method_source (~> 0.9.0)
+    public_suffix (3.0.2)
     rake (10.5.0)
+    safe_yaml (1.0.4)
+    webmock (3.4.2)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
+      hashdiff
 
 PLATFORMS
   ruby
@@ -29,7 +45,9 @@ DEPENDENCIES
   bundler (~> 1.16)
   manifique!
   minitest (~> 5.0)
+  pry (~> 0.11.3)
   rake (~> 10.0)
+  webmock (~> 3.4.2)
 
 BUNDLED WITH
    1.16.2
diff --git a/lib/manifique/web_client.rb b/lib/manifique/web_client.rb
index 08e60cc..178ffc3 100644
--- a/lib/manifique/web_client.rb
+++ b/lib/manifique/web_client.rb
@@ -3,6 +3,8 @@ require 'faraday_middleware'
 require "nokogiri"
 require 'nitlink/response'
 
+require 'pry'
+
 module Manifique
   class WebClient
     def initialize(options)
@@ -11,12 +13,21 @@ module Manifique
     end
 
     def fetch_web_manifest
+      do_get_request @url
+      # binding.pry
+    end
+
+    private
+
+    def do_get_request(url)
       conn = Faraday.new do |b|
         b.use FaradayMiddleware::FollowRedirects
         b.adapter :net_http
       end
-      res = conn.get @url
-      raise res.inspect
+      res = conn.get url
+      if res.status > 400
+        raise "Could not fetch #{url} successfully (#{res.status})"
+      end
     end
   end
 end
diff --git a/manifique.gemspec b/manifique.gemspec
index 91add59..fa10770 100644
--- a/manifique.gemspec
+++ b/manifique.gemspec
@@ -25,6 +25,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.16"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
+  spec.add_development_dependency "webmock", "~> 3.4.2"
+  spec.add_development_dependency "pry", "~> 0.11.3"
 
   spec.add_runtime_dependency "faraday", "~> 0.15.2"
   spec.add_runtime_dependency "faraday_middleware", "~> 0.12.2"
diff --git a/test/manifique_test.rb b/test/manifique_test.rb
index 5377f6f..ada2d34 100644
--- a/test/manifique_test.rb
+++ b/test/manifique_test.rb
@@ -1,6 +1,7 @@
 require "test_helper"
 
 class ManifiqueTest < Minitest::Test
+
   def test_that_it_has_a_version_number
     refute_nil ::Manifique::VERSION
   end
@@ -13,8 +14,19 @@ class ManifiqueTest < Minitest::Test
     assert_raises(RuntimeError) { Manifique::Agent.new(url: "htp:/foo.com") }
   end
 
-  def test_fetch_metadata
-    agent = Manifique::Agent.new(url: 'https://example.com')
-    assert_equal agent.fetch_metadata, 'https://example.com'
+  def test_fetch_metadata_request_404
+    stub_request(:get, "http://example.com/404").
+      to_return(body: "", status: 404, headers: {})
+
+    agent = Manifique::Agent.new(url: 'http://example.com/404')
+    assert_raises(RuntimeError) { agent.fetch_metadata }
+  end
+
+  def test_fetch_metadata_request_500
+    stub_request(:get, "http://example.com/500").
+      to_return(body: "", status: 500, headers: {})
+
+    agent = Manifique::Agent.new(url: 'http://example.com/500')
+    assert_raises(RuntimeError) { agent.fetch_metadata }
   end
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index d7bba43..120bce2 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,3 +2,4 @@ $LOAD_PATH.unshift File.expand_path("../../lib", __FILE__)
 require "manifique"
 
 require "minitest/autorun"
+require "webmock/minitest"