diff --git a/.travis.yml b/.travis.yml
index 505d8683e..2aa647e9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,10 +3,10 @@ cache:
   bundler: true
   yarn: true
   directories:
-  - node_modules
-  - public/assets
-  - public/packs-test
-  - tmp/cache/babel-loader
+    - node_modules
+    - public/assets
+    - public/packs-test
+    - tmp/cache/babel-loader
 dist: trusty
 sudo: false
 
@@ -25,15 +25,15 @@ addons:
   postgresql: 9.4
   apt:
     sources:
-    - trusty-media
-    - sourceline: deb https://dl.yarnpkg.com/debian/ stable main
-      key_url: https://dl.yarnpkg.com/debian/pubkey.gpg
+      - trusty-media
+      - sourceline: deb https://dl.yarnpkg.com/debian/ stable main
+        key_url: https://dl.yarnpkg.com/debian/pubkey.gpg
     packages:
-    - ffmpeg
-    - libicu-dev
-    - libprotobuf-dev
-    - protobuf-compiler
-    - yarn
+      - ffmpeg
+      - libicu-dev
+      - libprotobuf-dev
+      - protobuf-compiler
+      - yarn
 
 rvm:
   - 2.4.2
diff --git a/app/controllers/activitypub/inboxes_controller.rb b/app/controllers/activitypub/inboxes_controller.rb
index 7d0bc74d3..af51e32d5 100644
--- a/app/controllers/activitypub/inboxes_controller.rb
+++ b/app/controllers/activitypub/inboxes_controller.rb
@@ -11,7 +11,7 @@ class ActivityPub::InboxesController < Api::BaseController
       process_payload
       head 202
     else
-      [signature_verification_failure_reason, 401]
+      render plain: signature_verification_failure_reason, status: 401
     end
   end
 
diff --git a/app/controllers/api/salmon_controller.rb b/app/controllers/api/salmon_controller.rb
index 143e9d3cd..ac5f3268d 100644
--- a/app/controllers/api/salmon_controller.rb
+++ b/app/controllers/api/salmon_controller.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Api::SalmonController < Api::BaseController
+  include SignatureVerification
+
   before_action :set_account
   respond_to :txt
 
@@ -9,7 +11,7 @@ class Api::SalmonController < Api::BaseController
       process_salmon
       head 202
     elsif payload.present?
-      [signature_verification_failure_reason, 401]
+      render plain: signature_verification_failure_reason, status: 401
     else
       head 400
     end
diff --git a/app/controllers/settings/preferences_controller.rb b/app/controllers/settings/preferences_controller.rb
index 7cd1abe0c..c853b5ab7 100644
--- a/app/controllers/settings/preferences_controller.rb
+++ b/app/controllers/settings/preferences_controller.rb
@@ -36,6 +36,7 @@ class Settings::PreferencesController < Settings::BaseController
       :setting_favourite_modal,
       :setting_delete_modal,
       :setting_auto_play_gif,
+      :setting_display_sensitive_media,
       :setting_reduce_motion,
       :setting_system_font_ui,
       :setting_noindex,
diff --git a/app/javascript/mastodon/components/media_gallery.js b/app/javascript/mastodon/components/media_gallery.js
index 20febdb16..a276b17d5 100644
--- a/app/javascript/mastodon/components/media_gallery.js
+++ b/app/javascript/mastodon/components/media_gallery.js
@@ -6,7 +6,7 @@ import IconButton from './icon_button';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { isIOS } from '../is_mobile';
 import classNames from 'classnames';
-import { autoPlayGif } from '../initial_state';
+import { autoPlayGif, displaySensitiveMedia } from '../initial_state';
 
 const messages = defineMessages({
   toggle_visible: { id: 'media_gallery.toggle_visible', defaultMessage: 'Toggle visibility' },
@@ -187,7 +187,7 @@ export default class MediaGallery extends React.PureComponent {
   };
 
   state = {
-    visible: !this.props.sensitive,
+    visible: !this.props.sensitive || displaySensitiveMedia,
   };
 
   componentWillReceiveProps (nextProps) {
diff --git a/app/javascript/mastodon/features/account/components/action_bar.js b/app/javascript/mastodon/features/account/components/action_bar.js
index cb849fa5d..b4f812c9a 100644
--- a/app/javascript/mastodon/features/account/components/action_bar.js
+++ b/app/javascript/mastodon/features/account/components/action_bar.js
@@ -122,7 +122,7 @@ export default class ActionBar extends React.PureComponent {
 
           <div className='account__action-bar-links'>
             <Link className='account__action-bar__tab' to={`/accounts/${account.get('id')}`}>
-              <span><FormattedMessage id='account.posts' defaultMessage='Posts' /></span>
+              <span><FormattedMessage id='account.posts' defaultMessage='Toots' /></span>
               <strong><FormattedNumber value={account.get('statuses_count')} /></strong>
             </Link>
 
diff --git a/app/javascript/mastodon/features/video/index.js b/app/javascript/mastodon/features/video/index.js
index 0ee8bb6c8..7752fc057 100644
--- a/app/javascript/mastodon/features/video/index.js
+++ b/app/javascript/mastodon/features/video/index.js
@@ -4,6 +4,7 @@ import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { throttle } from 'lodash';
 import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from '../ui/util/fullscreen';
+import { displaySensitiveMedia } from '../../initial_state';
 
 const messages = defineMessages({
   play: { id: 'video.play', defaultMessage: 'Play' },
@@ -107,7 +108,7 @@ export default class Video extends React.PureComponent {
     fullscreen: false,
     hovered: false,
     muted: false,
-    revealed: !this.props.sensitive,
+    revealed: !this.props.sensitive || displaySensitiveMedia,
   };
 
   setPlayerRef = c => {
diff --git a/app/javascript/mastodon/initial_state.js b/app/javascript/mastodon/initial_state.js
index 3fc45077d..6f1356324 100644
--- a/app/javascript/mastodon/initial_state.js
+++ b/app/javascript/mastodon/initial_state.js
@@ -5,6 +5,7 @@ const getMeta = (prop) => initialState && initialState.meta && initialState.meta
 
 export const reduceMotion = getMeta('reduce_motion');
 export const autoPlayGif = getMeta('auto_play_gif');
+export const displaySensitiveMedia = getMeta('display_sensitive_media');
 export const unfollowModal = getMeta('unfollow_modal');
 export const boostModal = getMeta('boost_modal');
 export const deleteModal = getMeta('delete_modal');
diff --git a/app/javascript/mastodon/locales/defaultMessages.json b/app/javascript/mastodon/locales/defaultMessages.json
index a27f17b42..c0841d6f5 100644
--- a/app/javascript/mastodon/locales/defaultMessages.json
+++ b/app/javascript/mastodon/locales/defaultMessages.json
@@ -433,7 +433,7 @@
         "id": "account.view_full_profile"
       },
       {
-        "defaultMessage": "Posts",
+        "defaultMessage": "Toots",
         "id": "account.posts"
       },
       {
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index 028f9aefd..e72c45bf2 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -13,7 +13,7 @@
   "account.moved_to": "{name} has moved to:",
   "account.mute": "Mute @{name}",
   "account.mute_notifications": "Mute notifications from @{name}",
-  "account.posts": "Posts",
+  "account.posts": "Toots",
   "account.report": "Report @{name}",
   "account.requested": "Awaiting approval. Click to cancel follow request",
   "account.share": "Share @{name}'s profile",
diff --git a/app/lib/user_settings_decorator.rb b/app/lib/user_settings_decorator.rb
index 5f0176f27..c7afdacc2 100644
--- a/app/lib/user_settings_decorator.rb
+++ b/app/lib/user_settings_decorator.rb
@@ -15,20 +15,21 @@ class UserSettingsDecorator
   private
 
   def process_update
-    user.settings['notification_emails'] = merged_notification_emails if change?('notification_emails')
-    user.settings['interactions']        = merged_interactions if change?('interactions')
-    user.settings['default_privacy']     = default_privacy_preference if change?('setting_default_privacy')
-    user.settings['default_sensitive']   = default_sensitive_preference if change?('setting_default_sensitive')
-    user.settings['unfollow_modal']      = unfollow_modal_preference if change?('setting_unfollow_modal')
-    user.settings['boost_modal']         = boost_modal_preference if change?('setting_boost_modal')
+    user.settings['notification_emails']     = merged_notification_emails if change?('notification_emails')
+    user.settings['interactions']            = merged_interactions if change?('interactions')
+    user.settings['default_privacy']         = default_privacy_preference if change?('setting_default_privacy')
+    user.settings['default_sensitive']       = default_sensitive_preference if change?('setting_default_sensitive')
+    user.settings['unfollow_modal']          = unfollow_modal_preference if change?('setting_unfollow_modal')
+    user.settings['boost_modal']             = boost_modal_preference if change?('setting_boost_modal')
     user.settings['favourite_modal']         = favourite_modal_preference if change?('setting_favourite_modal')
-    user.settings['delete_modal']        = delete_modal_preference if change?('setting_delete_modal')
-    user.settings['auto_play_gif']       = auto_play_gif_preference if change?('setting_auto_play_gif')
-    user.settings['reduce_motion']       = reduce_motion_preference if change?('setting_reduce_motion')
-    user.settings['system_font_ui']      = system_font_ui_preference if change?('setting_system_font_ui')
-    user.settings['noindex']             = noindex_preference if change?('setting_noindex')
-    user.settings['flavour']             = flavour_preference if change?('setting_flavour')
-    user.settings['skin']                = skin_preference if change?('setting_skin')
+    user.settings['delete_modal']            = delete_modal_preference if change?('setting_delete_modal')
+    user.settings['auto_play_gif']           = auto_play_gif_preference if change?('setting_auto_play_gif')
+    user.settings['display_sensitive_media'] = display_sensitive_media_preference if change?('setting_display_sensitive_media')
+    user.settings['reduce_motion']           = reduce_motion_preference if change?('setting_reduce_motion')
+    user.settings['system_font_ui']          = system_font_ui_preference if change?('setting_system_font_ui')
+    user.settings['noindex']                 = noindex_preference if change?('setting_noindex')
+    user.settings['flavour']                 = flavour_preference if change?('setting_flavour')
+    user.settings['skin']                    = skin_preference if change?('setting_skin')
   end
 
   def merged_notification_emails
@@ -71,6 +72,10 @@ class UserSettingsDecorator
     boolean_cast_setting 'setting_auto_play_gif'
   end
 
+  def display_sensitive_media_preference
+    boolean_cast_setting 'setting_display_sensitive_media'
+  end
+
   def reduce_motion_preference
     boolean_cast_setting 'setting_reduce_motion'
   end
diff --git a/app/models/invite.rb b/app/models/invite.rb
index b87a3b722..4ba5432d2 100644
--- a/app/models/invite.rb
+++ b/app/models/invite.rb
@@ -4,7 +4,7 @@
 # Table name: invites
 #
 #  id         :integer          not null, primary key
-#  user_id    :integer
+#  user_id    :integer          not null
 #  code       :string           default(""), not null
 #  expires_at :datetime
 #  max_uses   :integer
diff --git a/app/models/notification.rb b/app/models/notification.rb
index 733f89cf7..7f8dae5ec 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -69,7 +69,7 @@ class Notification < ApplicationRecord
 
   class << self
     def reload_stale_associations!(cached_items)
-      account_ids = cached_items.map(&:from_account_id).uniq
+      account_ids = (cached_items.map(&:from_account_id) + cached_items.map { |item| item.target_status&.account_id }.compact).uniq
 
       return if account_ids.empty?
 
@@ -77,6 +77,7 @@ class Notification < ApplicationRecord
 
       cached_items.each do |item|
         item.from_account = accounts[item.from_account_id]
+        item.target_status.account = accounts[item.target_status.account_id] if item.target_status
       end
     end
 
diff --git a/app/models/user.rb b/app/models/user.rb
index d495fc390..af54efded 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -84,7 +84,7 @@ class User < ApplicationRecord
   has_many :session_activations, dependent: :destroy
 
   delegate :auto_play_gif, :default_sensitive, :unfollow_modal, :boost_modal, :favourite_modal, :delete_modal,
-           :reduce_motion, :system_font_ui, :noindex, :flavour, :skin,
+           :reduce_motion, :system_font_ui, :noindex, :flavour, :skin, :display_sensitive_media,
            to: :settings, prefix: :setting, allow_nil: false
 
   attr_accessor :invite_code
diff --git a/app/models/web/setting.rb b/app/models/web/setting.rb
index 12b9d1226..0a5129d17 100644
--- a/app/models/web/setting.rb
+++ b/app/models/web/setting.rb
@@ -7,7 +7,7 @@
 #  data       :json
 #  created_at :datetime         not null
 #  updated_at :datetime         not null
-#  user_id    :integer
+#  user_id    :integer          not null
 #
 
 class Web::Setting < ApplicationRecord
diff --git a/app/serializers/initial_state_serializer.rb b/app/serializers/initial_state_serializer.rb
index 904daa804..5434f1c56 100644
--- a/app/serializers/initial_state_serializer.rb
+++ b/app/serializers/initial_state_serializer.rb
@@ -25,13 +25,14 @@ class InitialStateSerializer < ActiveModel::Serializer
     }
 
     if object.current_account
-      store[:me]             = object.current_account.id.to_s
-      store[:unfollow_modal] = object.current_account.user.setting_unfollow_modal
-      store[:boost_modal]    = object.current_account.user.setting_boost_modal
-      store[:favourite_modal]  = object.current_account.user.setting_favourite_modal
-      store[:delete_modal]   = object.current_account.user.setting_delete_modal
-      store[:auto_play_gif]  = object.current_account.user.setting_auto_play_gif
-      store[:reduce_motion]  = object.current_account.user.setting_reduce_motion
+      store[:me]                      = object.current_account.id.to_s
+      store[:unfollow_modal]          = object.current_account.user.setting_unfollow_modal
+      store[:boost_modal]             = object.current_account.user.setting_boost_modal
+      store[:favourite_modal]         = object.current_account.user.setting_favourite_modal
+      store[:delete_modal]            = object.current_account.user.setting_delete_modal
+      store[:auto_play_gif]           = object.current_account.user.setting_auto_play_gif
+      store[:display_sensitive_media] = object.current_account.user.setting_display_sensitive_media
+      store[:reduce_motion]           = object.current_account.user.setting_reduce_motion
     end
 
     store
diff --git a/app/views/settings/preferences/show.html.haml b/app/views/settings/preferences/show.html.haml
index a2a17d0d6..75dfa027e 100644
--- a/app/views/settings/preferences/show.html.haml
+++ b/app/views/settings/preferences/show.html.haml
@@ -36,6 +36,7 @@
 
   .fields-group
     = f.input :setting_auto_play_gif, as: :boolean, wrapper: :with_label
+    = f.input :setting_display_sensitive_media, as: :boolean, wrapper: :with_label
     = f.input :setting_reduce_motion, as: :boolean, wrapper: :with_label
     = f.input :setting_system_font_ui, as: :boolean, wrapper: :with_label
 
diff --git a/app/views/stream_entries/_detailed_status.html.haml b/app/views/stream_entries/_detailed_status.html.haml
index d88ec8280..470bff218 100644
--- a/app/views/stream_entries/_detailed_status.html.haml
+++ b/app/views/stream_entries/_detailed_status.html.haml
@@ -22,9 +22,9 @@
   - if !status.media_attachments.empty?
     - if status.media_attachments.first.video?
       - video = status.media_attachments.first
-      %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive?, width: 670, height: 380, detailed: true) }}<
+      %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 670, height: 380, detailed: true) }}
     - else
-      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, sensitive: status.sensitive?, standalone: true, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, 'reduceMotion': current_account&.user&.setting_reduce_motion, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}<
+      %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 380, sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, standalone: true, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, 'reduceMotion': current_account&.user&.setting_reduce_motion, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
   - elsif status.preview_cards.first
     %div{ data: { component: 'Card', props: Oj.dump('maxDescription': 160, card: ActiveModelSerializers::SerializableResource.new(status.preview_cards.first, serializer: REST::PreviewCardSerializer).as_json) }}
 
diff --git a/app/views/stream_entries/_simple_status.html.haml b/app/views/stream_entries/_simple_status.html.haml
index 0b45ff308..03d416fd6 100644
--- a/app/views/stream_entries/_simple_status.html.haml
+++ b/app/views/stream_entries/_simple_status.html.haml
@@ -24,6 +24,6 @@
       - unless status.media_attachments.empty?
         - if status.media_attachments.first.video?
           - video = status.media_attachments.first
-          %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive?, width: 610, height: 343) }}><
+          %div{ data: { component: 'Video', props: Oj.dump(src: video.file.url(:original), preview: video.file.url(:small), sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, width: 610, height: 343) }}
         - else
-          %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 343, sensitive: status.sensitive?, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}><
+          %div{ data: { component: 'MediaGallery', props: Oj.dump(height: 343, sensitive: status.sensitive? && !current_account&.user&.setting_display_sensitive_media, 'autoPlayGif': current_account&.user&.setting_auto_play_gif, media: status.media_attachments.map { |a| ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json }) }}
diff --git a/config/locales/simple_form.en.yml b/config/locales/simple_form.en.yml
index e097e80ae..c958431d3 100644
--- a/config/locales/simple_form.en.yml
+++ b/config/locales/simple_form.en.yml
@@ -45,6 +45,7 @@ en:
         setting_default_privacy: Post privacy
         setting_default_sensitive: Always mark media as sensitive
         setting_delete_modal: Show confirmation dialog before deleting a toot
+        setting_display_sensitive_media: Always show media marked as sensitive
         setting_favourite_modal: Show confirmation dialog before favouriting
         setting_noindex: Opt-out of search engine indexing
         setting_reduce_motion: Reduce motion in animations
diff --git a/config/settings.yml b/config/settings.yml
index 592be1a8a..580a20895 100644
--- a/config/settings.yml
+++ b/config/settings.yml
@@ -25,6 +25,7 @@ defaults: &defaults
   favourite_modal: false
   delete_modal: true
   auto_play_gif: false
+  display_sensitive_media: false
   reduce_motion: false
   system_font_ui: false
   noindex: false
diff --git a/db/migrate/20180206000000_change_user_id_nonnullable.rb b/db/migrate/20180206000000_change_user_id_nonnullable.rb
new file mode 100644
index 000000000..4eecb6154
--- /dev/null
+++ b/db/migrate/20180206000000_change_user_id_nonnullable.rb
@@ -0,0 +1,6 @@
+class ChangeUserIdNonnullable < ActiveRecord::Migration[5.1]
+  def change
+    change_column_null :invites, :user_id, false
+    change_column_null :web_settings, :user_id, false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 09567de35..c118377df 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180204034416) do
+ActiveRecord::Schema.define(version: 20180206000000) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -204,7 +204,7 @@ ActiveRecord::Schema.define(version: 20180204034416) do
   end
 
   create_table "invites", force: :cascade do |t|
-    t.bigint "user_id"
+    t.bigint "user_id", null: false
     t.string "code", default: "", null: false
     t.datetime "expires_at"
     t.integer "max_uses"
@@ -526,7 +526,7 @@ ActiveRecord::Schema.define(version: 20180204034416) do
     t.json "data"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.bigint "user_id"
+    t.bigint "user_id", null: false
     t.index ["user_id"], name: "index_web_settings_on_user_id", unique: true
   end
 
diff --git a/spec/controllers/api/salmon_controller_spec.rb b/spec/controllers/api/salmon_controller_spec.rb
index 323d85b61..8af8b83a8 100644
--- a/spec/controllers/api/salmon_controller_spec.rb
+++ b/spec/controllers/api/salmon_controller_spec.rb
@@ -40,7 +40,7 @@ RSpec.describe Api::SalmonController, type: :controller do
       end
     end
 
-    context 'with invalid post data' do
+    context 'with empty post data' do
       before do
         request.env['RAW_POST_DATA'] = ''
         post :update, params: { id: account.id }
@@ -50,5 +50,19 @@ RSpec.describe Api::SalmonController, type: :controller do
         expect(response).to have_http_status(400)
       end
     end
+
+    context 'with invalid post data' do
+      before do
+        service = double(call: false)
+        allow(VerifySalmonService).to receive(:new).and_return(service)
+
+        request.env['RAW_POST_DATA'] = File.read(File.join(Rails.root, 'spec', 'fixtures', 'salmon', 'mention.xml'))
+        post :update, params: { id: account.id }
+      end
+
+      it 'returns http client error' do
+        expect(response).to have_http_status(401)
+      end
+    end
   end
 end
diff --git a/spec/services/fetch_atom_service_spec.rb b/spec/services/fetch_atom_service_spec.rb
index 5491fd027..d7f162b85 100644
--- a/spec/services/fetch_atom_service_spec.rb
+++ b/spec/services/fetch_atom_service_spec.rb
@@ -1,4 +1,63 @@
 require 'rails_helper'
 
 RSpec.describe FetchAtomService do
+  describe '#link_header' do
+    context 'Link is Array' do
+      target = FetchAtomService.new
+      target.instance_variable_set('@response', 'Link' => [
+        '<http://example.com/>; rel="up"; meta="bar"',
+        '<http://example.com/foo>; rel="self"',
+      ])
+
+      it 'set first link as link_header' do
+        expect(target.send(:link_header).links[0].href).to eq 'http://example.com/'
+      end
+    end
+
+    context 'Link is not Array' do
+      target = FetchAtomService.new
+      target.instance_variable_set('@response', 'Link' => '<http://example.com/foo>; rel="self", <http://example.com/>; rel = "up"')
+
+      it { expect(target.send(:link_header).links[0].href).to eq 'http://example.com/foo' }
+    end
+  end
+
+  describe '#perform_request' do
+    let(:url) { 'http://example.com' }
+    context 'Check method result' do
+      before do
+        WebMock.stub_request(:get, url).to_return(status: 200, body: '', headers: {})
+        @target = FetchAtomService.new
+        @target.instance_variable_set('@url', url)
+      end
+
+      it 'HTTP::Response instance is returned and set to @response' do
+        expect(@target.send(:perform_request).status.to_s).to eq '200 OK'
+        expect(@target.instance_variable_get('@response')).to be_instance_of HTTP::Response
+      end
+    end
+
+    context 'check passed parameters to Request' do
+      before do
+        @target = FetchAtomService.new
+        @target.instance_variable_set('@url', url)
+        @target.instance_variable_set('@unsupported_activity', unsupported_activity)
+        allow(Request).to receive(:new).with(:get, url)
+        expect(Request).to receive_message_chain(:new, :add_headers).with('Accept' => accept)
+        allow(Request).to receive_message_chain(:new, :add_headers, :perform).with(no_args)
+      end
+
+      context '@unsupported_activity is true' do
+        let(:unsupported_activity) { true }
+        let(:accept) { 'text/html' }
+        it { @target.send(:perform_request) }
+      end
+
+      context '@unsupported_activity is false' do
+        let(:unsupported_activity) { false }
+        let(:accept) { 'application/activity+json, application/ld+json, application/atom+xml, text/html' }
+        it { @target.send(:perform_request) }
+      end
+    end
+  end
 end