Symbolize client options before passing them through.

.rspec

@@ -0,0 +1,2 @@
+--colour
+--format=progress

Rakefile

@@ -1,2 +1,9 @@
 #!/usr/bin/env rake
 require "bundler/gem_tasks"
+require 'rspec/core/rake_task'
+
+desc 'Default: run specs.'
+task :default => :spec
+
+desc "Run specs"
+RSpec::Core::RakeTask.new

lib/omniauth/strategies/oauth2.rb

@@ -22,7 +22,7 @@ class OAuth2
       attr_accessor :access_token
 
       def client
-        ::OAuth2::Client.new(options.client_id, options.client_secret, options.client_options)
+        ::OAuth2::Client.new(options.client_id, options.client_secret, options.client_options.inject({}){|h,(k,v)| h[k.to_sym] = v; h})
       end
 
       def callback_url
@@ -36,7 +36,7 @@ def callback_url
       end
 
       def request_phase
-        redirect client.auth_code.authorize_url({:redirect_uri => callback_url}.merge(options))
+        redirect client.auth_code.authorize_url({:redirect_uri => callback_url}.merge(options.authorize_params))
       end
 
       def callback_phase

spec/omniauth/strategies/oauth2_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe OmniAuth::Strategies::OAuth2 do
+  def app; lambda{|env| [200, {}, ["Hello."]]} end
+  let(:fresh_strategy){ Class.new(OmniAuth::Strategies::OAuth2) }
+
+  describe '#client' do
+    subject{ fresh_strategy }
+
+    it 'should be initialized with symbolized client_options' do
+      instance = subject.new(app, :client_options => {'authorize_url' => 'https://example.com'})
+      instance.client.options[:authorize_url].should == 'https://example.com'
+    end
+  end
+end