Make the request accept */* when HTTP_ACCEPT is not present or blank

lib/sinatra/base.rb

@@ -22,8 +22,12 @@ module Sinatra
     # Returns an array of acceptable media types for the response
     def accept
       @env['sinatra.accept'] ||= begin
-        @env['HTTP_ACCEPT'].to_s.scan(HEADER_VALUE_WITH_PARAMS).
-          map! { |e| AcceptEntry.new(e) }.sort
+        if @env.include? 'HTTP_ACCEPT' and @env['HTTP_ACCEPT'].to_s != ''
+          @env['HTTP_ACCEPT'].to_s.scan(HEADER_VALUE_WITH_PARAMS).
+            map! { |e| AcceptEntry.new(e) }.sort
+        else
+          [AcceptEntry.new('*/*')]
+        end
       end
     end
 

test/request_test.rb

@@ -75,4 +75,18 @@ class RequestTest < Test::Unit::TestCase
     expected = { 'unquoted' => '0.25', 'quoted' => '0.25', 'chartest' => '";,x' }
     assert_equal(expected, request.preferred_type.params)
   end
+
+  it 'accepts */* when HTTP_ACCEPT is not present in the request' do
+    request = Sinatra::Request.new Hash.new
+    assert_equal 1, request.accept.size
+    assert request.accept?('text/html')
+    assert_equal '*/*', request.preferred_type.to_s
+  end
+
+  it 'accepts */* when HTTP_ACCEPT is blank in the request' do
+    request = Sinatra::Request.new 'HTTP_ACCEPT' => ''
+    assert_equal 1, request.accept.size
+    assert request.accept?('text/html')
+    assert_equal '*/*', request.preferred_type.to_s
+  end
 end