diff --git a/lib/saml_idp.rb b/lib/saml_idp.rb
index 99df05e1..543111a3 100644
--- a/lib/saml_idp.rb
+++ b/lib/saml_idp.rb
@@ -9,7 +9,7 @@ module SamlIdp
   require 'saml_idp/metadata_builder'
   require 'saml_idp/version'
   require 'saml_idp/fingerprint'
-  require 'saml_idp/engine' if defined?(::Rails)
+  require 'saml_idp/engine' if defined?(::Rails::Engine)
 
   def self.config
     @config ||= SamlIdp::Configurator.new
diff --git a/lib/saml_idp/configurator.rb b/lib/saml_idp/configurator.rb
index 4998869a..e645f912 100644
--- a/lib/saml_idp/configurator.rb
+++ b/lib/saml_idp/configurator.rb
@@ -35,7 +35,7 @@ def initialize
       self.service_provider.persisted_metadata_getter = ->(id, service_provider) {  }
       self.session_expiry = 0
       self.attributes = {}
-      self.logger = defined?(::Rails) ? Rails.logger : ->(msg) { puts msg }
+      self.logger = (defined?(::Rails) && Rails.respond_to?(:logger)) ? Rails.logger : ->(msg) { puts msg }
     end
 
     # formats
diff --git a/saml_idp.gemspec b/saml_idp.gemspec
index d8346128..027139e5 100644
--- a/saml_idp.gemspec
+++ b/saml_idp.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |s|
   s.authors = ['Jon Phenow']
   s.email = 'jon.phenow@sportngin.com'
   s.homepage = 'https://github.com/saml-idp/saml_idp'
-  s.summary = 'SAML Indentity Provider for Ruby'
+  s.summary = 'SAML Identity Provider for Ruby'
   s.description = 'SAML IdP (Identity Provider) Library for Ruby'
   s.date = Time.now.utc.strftime('%Y-%m-%d')
   s.files = Dir['lib/**/*', 'LICENSE', 'README.md', 'Gemfile', 'saml_idp.gemspec']
@@ -46,6 +46,7 @@ Gem::Specification.new do |s|
   s.add_dependency('activesupport', '>= 5.2')
   s.add_dependency('builder', '>= 3.0')
   s.add_dependency('nokogiri', '>= 1.6.2')
+  s.add_dependency('ostruct')
   s.add_dependency('rexml')
   s.add_dependency('xmlenc', '>= 0.7.1')
 
@@ -56,6 +57,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rails', '>= 5.2')
   s.add_development_dependency('debug')
   s.add_development_dependency('rake')
+  s.add_development_dependency('debug')
   s.add_development_dependency('rspec', '>= 3.7.0')
   s.add_development_dependency('ruby-saml', '>= 1.7.2')
   s.add_development_dependency('simplecov')
diff --git a/spec/lib/saml_idp/configurator_spec.rb b/spec/lib/saml_idp/configurator_spec.rb
index 5148a289..33141117 100644
--- a/spec/lib/saml_idp/configurator_spec.rb
+++ b/spec/lib/saml_idp/configurator_spec.rb
@@ -47,5 +47,34 @@ module SamlIdp
     it 'has a valid session_expiry' do
       expect(subject.session_expiry).to eq(0)
     end
+
+    context "logger initialization" do
+      context 'when Rails has been properly initialized' do
+        it 'sets logger to Rails.logger' do
+          rails_logger = double("Rails.logger")
+          stub_const("Rails", double(logger: rails_logger))
+
+          expect(subject.logger).to eq(Rails.logger)
+        end
+      end
+
+      context 'when Rails is not fully initialized' do
+        it 'sets logger to a lambda' do
+          stub_const("Rails", Class.new)
+
+          expect(subject.logger).to be_a(Proc)
+          expect { subject.logger.call("test") }.to output("test\n").to_stdout
+        end
+      end
+
+      context 'when Rails is not defined' do
+        it 'sets logger to a lambda' do
+          hide_const("Rails")
+
+          expect(subject.logger).to be_a(Proc)
+          expect { subject.logger.call("test") }.to output("test\n").to_stdout
+        end
+      end
+    end
   end
 end
diff --git a/spec/support/saml_request_macros.rb b/spec/support/saml_request_macros.rb
index 5efbdf29..d4abf3d6 100644
--- a/spec/support/saml_request_macros.rb
+++ b/spec/support/saml_request_macros.rb
@@ -96,6 +96,17 @@ def idp_configure(saml_acs_url = "https://foo.example.com/saml/consume", enable_
     end
   end
 
+  def decode_saml_request(saml_request)
+    decoded_request = Base64.decode64(saml_request)
+    begin
+      # Try to decompress, since SAMLRequest might be compressed
+      Zlib::Inflate.new(-Zlib::MAX_WBITS).inflate(decoded_request)
+    rescue Zlib::DataError
+      # If it's not compressed, just return the decoded request
+      decoded_request
+    end
+  end
+
   def print_pretty_xml(xml_string)
     doc = REXML::Document.new xml_string
     outbuf = ""