process text/* if it appears in the middle of

HTTP_ACCEPT parameter

actionpack/lib/action_dispatch/http/mime_type.rb

@@ -120,7 +120,11 @@ module Mime
             params, q = header.split(/;\s*q=/)
             if params
               params.strip!
-              list << AcceptItem.new(index, params, q) unless params.empty?
+              if params =~ TRAILING_STAR_REGEXP
+                parse_data_with_trailing_star($1).each { |m| list << AcceptItem.new(index, m.to_s, q) }
+              else
+                list << AcceptItem.new(index, params, q) unless params.empty?
+              end
             end
           end
           list.sort!

actionpack/test/dispatch/mime_type_test.rb

@@ -29,6 +29,26 @@ class MimeTypeTest < ActiveSupport::TestCase
     end
   end
 
+  test "parse text with trailing star at the beginning" do
+    accept = "text/*, text/html, application/json, multipart/form-data"
+    expect = [Mime::JSON, Mime::XML, Mime::ICS, Mime::HTML, Mime::CSS, Mime::CSV, Mime::TEXT, Mime::YAML, Mime::JS, Mime::MULTIPART_FORM]
+    parsed = Mime::Type.parse(accept)
+    assert_equal expect.size, parsed.size
+    Range.new(0,expect.size-1).to_a.each do |index|
+      assert_equal expect[index], parsed[index], "Failed for index number #{index}"
+    end
+  end
+
+  test "parse text with trailing star in the end" do
+    accept = "text/html, application/json, multipart/form-data, text/*"
+    expect = [Mime::HTML, Mime::JSON, Mime::MULTIPART_FORM, Mime::XML, Mime::ICS, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT]
+    parsed = Mime::Type.parse(accept)
+    assert_equal 10, parsed.size
+    Range.new(0,expect.size-1).to_a.each do |index|
+      assert_equal expect[index], parsed[index], "Failed for index number #{index}"
+    end
+  end
+
   test "parse text with trailing star" do
     accept = "text/*"
     expect = [Mime::JSON, Mime::XML, Mime::ICS, Mime::HTML, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT].sort_by(&:to_s)