diff --git a/lib/src/common/activity_service.dart b/lib/src/common/activity_service.dart
index 6fc03bb7..ec3c20a5 100644
--- a/lib/src/common/activity_service.dart
+++ b/lib/src/common/activity_service.dart
@@ -149,7 +149,7 @@ class ActivityService extends Service {
 
   /// Marks all notifications up to [lastRead] as read.
   ///
-  /// API docs: https://developer.github.com/v3/activity/notifications/#mark-as-read
+  /// API docs: https://developer.github.com/v3/activity/notifications/#mark-notifications-as-read
   Future<bool> markNotificationsRead({DateTime lastRead}) {
     final data = {};
 
@@ -158,7 +158,9 @@ class ActivityService extends Service {
     }
 
     return github
-        .request('PUT', '/notifications', body: GitHubJson.encode(data))
+        .request('PUT', '/notifications',
+            body: GitHubJson.encode(data),
+            statusCode: StatusCodes.RESET_CONTENT)
         .then((response) {
       return response.statusCode == 205;
     });
@@ -180,7 +182,8 @@ class ActivityService extends Service {
 
     return github
         .request('PUT', '/repos/${slug.fullName}/notifications',
-            body: GitHubJson.encode(data))
+            body: GitHubJson.encode(data),
+            statusCode: StatusCodes.RESET_CONTENT)
         .then((response) {
       return response.statusCode == 205;
     });
@@ -198,7 +201,8 @@ class ActivityService extends Service {
   /// API docs: https://developer.github.com/v3/activity/notifications/#mark-a-thread-as-read
   Future<bool> markThreadRead(String threadId) {
     return github
-        .request('PATCH', '/notifications/threads/$threadId')
+        .request('PATCH', '/notifications/threads/$threadId',
+            statusCode: StatusCodes.RESET_CONTENT)
         .then((response) {
       return response.statusCode == StatusCodes.RESET_CONTENT;
     });
@@ -234,33 +238,42 @@ class ActivityService extends Service {
 
   /// Checks if the currently authenticated user has starred the specified repository.
   ///
-  /// API docs: https://developer.github.com/v3/activity/starring/#check-if-you-are-starring-a-repository
-  Future<bool> isStarred(RepositorySlug slug) {
-    return github
-        .request('GET', '/user/starred/${slug.fullName}')
-        .then((response) {
-      return response.statusCode == 204;
-    });
+  /// API docs: https://developer.github.com/v3/activity/starring/#check-if-a-repository-is-starred-by-the-authenticated-user
+  Future<bool> isStarred(RepositorySlug slug) async {
+    try {
+      await github.request(
+        'GET',
+        '/user/starred/${slug.fullName}',
+        statusCode: StatusCodes.NO_CONTENT,
+      );
+      return true;
+    } on NotFound {
+      return false;
+    }
   }
 
   /// Stars the specified repository for the currently authenticated user.
   ///
-  /// API docs: https://developer.github.com/v3/activity/starring/#star-a-repository
-  Future star(RepositorySlug slug) {
-    return github.request('PUT', '/user/starred/${slug.fullName}',
-        headers: {'Content-Length': '0'}).then((response) {
-      return null;
-    });
+  /// API docs: https://developer.github.com/v3/activity/starring/#star-a-repository-for-the-authenticated-user
+  Future<void> star(RepositorySlug slug) async {
+    await github.request(
+      'PUT',
+      '/user/starred/${slug.fullName}',
+      headers: {'Content-Length': '0'},
+      statusCode: StatusCodes.NO_CONTENT,
+    );
   }
 
   /// Unstars the specified repository for the currently authenticated user.
   ///
-  /// API docs: https://developer.github.com/v3/activity/starring/#unstar-a-repository
-  Future unstar(RepositorySlug slug) {
-    return github.request('DELETE', '/user/starred/${slug.fullName}',
-        headers: {'Content-Length': '0'}).then((response) {
-      return null;
-    });
+  /// API docs: https://developer.github.com/v3/activity/starring/#unstar-a-repository-for-the-authenticated-user
+  Future<void> unstar(RepositorySlug slug) async {
+    await github.request(
+      'DELETE',
+      '/user/starred/${slug.fullName}',
+      headers: {'Content-Length': '0'},
+      statusCode: StatusCodes.NO_CONTENT,
+    );
   }
 
   /// Lists the watchers of the specified repository.
@@ -318,11 +331,13 @@ class ActivityService extends Service {
   /// Deletes a Repository Subscription
   ///
   /// API docs: https://developer.github.com/v3/activity/watching/#delete-a-repository-subscription
-  Future deleteRepositorySubscription(RepositorySlug slug) {
-    return github.request('DELETE', '/repos/${slug.fullName}/subscription',
-        headers: {'Content-Length': '0'}).then((response) {
-      return null;
-    });
+  Future<void> deleteRepositorySubscription(RepositorySlug slug) async {
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/subscription',
+      headers: {'Content-Length': '0'},
+      statusCode: StatusCodes.NO_CONTENT,
+    );
   }
 }
 
@@ -385,7 +400,9 @@ class EventPoller {
           headers['If-None-Match'] = _lastFetched;
         }
 
-        github.request('GET', path, headers: headers).then(handleEvent);
+        github
+            .request('GET', path, headers: headers, statusCode: null)
+            .then(handleEvent);
       });
     }
 
@@ -395,7 +412,9 @@ class EventPoller {
       headers['If-None-Match'] = _lastFetched;
     }
 
-    github.request('GET', path, headers: headers).then(handleEvent);
+    github
+        .request('GET', path, headers: headers, statusCode: null)
+        .then(handleEvent);
 
     return _controller.stream;
   }
diff --git a/lib/src/common/gists_service.dart b/lib/src/common/gists_service.dart
index 89b266bf..b40675d5 100644
--- a/lib/src/common/gists_service.dart
+++ b/lib/src/common/gists_service.dart
@@ -84,10 +84,13 @@ class GistsService extends Service {
   /// Deletes the specified Gist.
   ///
   /// API docs: https://developer.github.com/v3/gists/#delete-a-gist
-  Future<bool> deleteGist(String id) {
-    return github.request('DELETE', '/gists/$id').then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> deleteGist(String id) async {
+    await github.request(
+      'DELETE',
+      '/gists/$id',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Edits a Gist.
@@ -125,28 +128,41 @@ class GistsService extends Service {
   /// Star the specified Gist.
   ///
   /// API docs: https://developer.github.com/v3/gists/#star-a-gist
-  Future<bool> starGist(String id) {
-    return github.request('POST', '/gists/$id/star').then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> starGist(String id) async {
+    await github.request(
+      'POST',
+      '/gists/$id/star',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Unstar the specified Gist.
   ///
   /// API docs: https://developer.github.com/v3/gists/#star-a-gist
-  Future<bool> unstarGist(String id) {
-    return github.request('DELETE', '/gists/$id/star').then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> unstarGist(String id) async {
+    await github.request(
+      'DELETE',
+      '/gists/$id/star',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Checks if the specified Gist is starred.
   ///
   /// API docs: https://developer.github.com/v3/gists/#check-if-a-gist-is-starred
-  Future<bool> isGistStarred(String id) {
-    return github.request('GET', '/gists/$id/star').then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> isGistStarred(String id) async {
+    try {
+      await github.request(
+        'GET',
+        '/gists/$id/star',
+        statusCode: StatusCodes.NO_CONTENT,
+      );
+      return true;
+    } on NotFound {
+      return false;
+    }
   }
 
   /// Forks the specified Gist.
@@ -176,9 +192,12 @@ class GistsService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/gists/comments/#create-a-comment
   Future<GistComment> createComment(String gistId, CreateGistComment request) {
-    return github.postJSON('/gists/$gistId/comments',
-        body: GitHubJson.encode(request),
-        convert: (i) => GistComment.fromJson(i));
+    return github.postJSON(
+      '/gists/$gistId/comments',
+      body: GitHubJson.encode(request),
+      statusCode: StatusCodes.CREATED,
+      convert: (i) => GistComment.fromJson(i),
+    );
   }
 
   // TODO: Implement editComment: https://developer.github.com/v3/gists/comments/#edit-a-comment
diff --git a/lib/src/common/git_service.dart b/lib/src/common/git_service.dart
index a6d9e98c..988bfcb1 100644
--- a/lib/src/common/git_service.dart
+++ b/lib/src/common/git_service.dart
@@ -98,21 +98,27 @@ class GitService extends Service {
     final headers = {'content-length': body.length.toString()};
 
     return github
-        .request('PATCH', '/repos/${slug.fullName}/git/refs/$ref',
-            body: body, headers: headers)
-        .then((response) {
-      return GitReference.fromJson(
-          jsonDecode(response.body) as Map<String, dynamic>);
-    });
+        .request(
+          'PATCH',
+          '/repos/${slug.fullName}/git/refs/$ref',
+          body: body,
+          headers: headers,
+          statusCode: StatusCodes.OK,
+        )
+        .then((response) => GitReference.fromJson(
+            jsonDecode(response.body) as Map<String, dynamic>));
   }
 
   /// Deletes a reference.
   ///
   /// API docs: https://developer.github.com/v3/git/refs/#delete-a-reference
-  Future<bool> deleteReference(RepositorySlug slug, String ref) {
-    return github
-        .request('DELETE', '/repos/${slug.fullName}/git/refs/$ref')
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+  Future<bool> deleteReference(RepositorySlug slug, String ref) async {
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/git/refs/$ref',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Fetches a tag from the repo given a SHA.
diff --git a/lib/src/common/github.dart b/lib/src/common/github.dart
index 27e36c5e..506f649d 100644
--- a/lib/src/common/github.dart
+++ b/lib/src/common/github.dart
@@ -143,7 +143,7 @@ class GitHub {
   /// The default [convert] function returns the input object.
   Future<T> getJSON<S, T>(
     String path, {
-    int statusCode,
+    @required int statusCode,
     void Function(http.Response response) fail,
     Map<String, String> headers,
     Map<String, String> params,
@@ -183,7 +183,7 @@ class GitHub {
   /// [T] represents the type return from this function after conversion
   Future<T> postJSON<S, T>(
     String path, {
-    int statusCode,
+    @required int statusCode,
     void Function(http.Response response) fail,
     Map<String, String> headers,
     Map<String, dynamic> params,
@@ -225,7 +225,7 @@ class GitHub {
   /// [T] represents the type return from this function after conversion
   Future<T> putJSON<S, T>(
     String path, {
-    int statusCode,
+    @required int statusCode,
     void Function(http.Response response) fail,
     Map<String, String> headers,
     Map<String, dynamic> params,
@@ -248,7 +248,7 @@ class GitHub {
   Future<T> requestJson<S, T>(
     String method,
     String path, {
-    int statusCode,
+    @required int statusCode,
     void Function(http.Response response) fail,
     Map<String, String> headers,
     Map<String, dynamic> params,
@@ -298,10 +298,10 @@ class GitHub {
   Future<http.Response> request(
     String method,
     String path, {
+    @required int statusCode,
     Map<String, String> headers,
     Map<String, dynamic> params,
     dynamic body,
-    int statusCode,
     void Function(http.Response response) fail,
     String preview,
   }) async {
diff --git a/lib/src/common/issues_service.dart b/lib/src/common/issues_service.dart
index db412d17..0f0d45ef 100644
--- a/lib/src/common/issues_service.dart
+++ b/lib/src/common/issues_service.dart
@@ -155,23 +155,28 @@ class IssuesService extends Service {
 
   /// Edit an issue.
   ///
-  /// API docs: https://developer.github.com/v3/issues/#edit-an-issue
+  /// API docs: https://developer.github.com/v3/issues/#update-an-issue
   Future<Issue> edit(
       RepositorySlug slug, int issueNumber, IssueRequest issue) async {
     return github
-        .request('PATCH', '/repos/${slug.fullName}/issues/$issueNumber',
-            body: GitHubJson.encode(issue))
-        .then<Issue>((response) {
-      return Issue.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
-    });
+        .request(
+          'PATCH',
+          '/repos/${slug.fullName}/issues/$issueNumber',
+          body: GitHubJson.encode(issue),
+          statusCode: StatusCodes.OK,
+        )
+        .then<Issue>((response) =>
+            Issue.fromJson(jsonDecode(response.body) as Map<String, dynamic>));
   }
 
   /// Get an issue.
   ///
-  /// API docs: https://developer.github.com/v3/issues/#get-a-single-issue
-  Future<Issue> get(RepositorySlug slug, int issueNumber) =>
-      github.getJSON('/repos/${slug.fullName}/issues/$issueNumber',
-          convert: (i) => Issue.fromJson(i));
+  /// API docs: https://developer.github.com/v3/issues/#get-an-issue
+  Future<Issue> get(RepositorySlug slug, int issueNumber) => github.getJSON(
+        '/repos/${slug.fullName}/issues/$issueNumber',
+        statusCode: StatusCodes.OK,
+        convert: (i) => Issue.fromJson(i),
+      );
 
   /// Create an issue.
   ///
@@ -180,6 +185,7 @@ class IssuesService extends Service {
     final response = await github.request(
       'POST',
       '/repos/${slug.fullName}/issues',
+      statusCode: StatusCodes.CREATED,
       body: GitHubJson.encode(issue),
     );
 
@@ -203,10 +209,17 @@ class IssuesService extends Service {
   /// Checks if a user is an assignee for the specified repository.
   ///
   /// API docs: https://developer.github.com/v3/issues/assignees/#check-assignee
-  Future<bool> isAssignee(RepositorySlug slug, String repoName) {
-    return github
-        .request('GET', '/repos/${slug.fullName}/assignees/$repoName')
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+  Future<bool> isAssignee(RepositorySlug slug, String repoName) async {
+    try {
+      await github.request(
+        'GET',
+        '/repos/${slug.fullName}/assignees/$repoName',
+        statusCode: StatusCodes.NO_CONTENT,
+      );
+      return true;
+    } on NotFound {
+      return false;
+    }
   }
 
   /// Lists comments on the specified issue.
@@ -234,8 +247,11 @@ class IssuesService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/issues/comments/#get-a-single-comment
   Future<IssueComment> getComment(RepositorySlug slug, int id) =>
-      github.getJSON('/repos/${slug.fullName}/issues/comments/$id',
-          convert: (i) => IssueComment.fromJson(i));
+      github.getJSON(
+        '/repos/${slug.fullName}/issues/comments/$id',
+        statusCode: StatusCodes.OK,
+        convert: (i) => IssueComment.fromJson(i),
+      );
 
   /// Creates a new comment on the specified issue
   ///
@@ -256,10 +272,13 @@ class IssuesService extends Service {
   /// Deletes an issue comment.
   ///
   /// API docs: https://developer.github.com/v3/issues/comments/#delete-a-comment
-  Future<bool> deleteComment(RepositorySlug slug, int id) {
-    return github
-        .request('DELETE', '/repos/${slug.fullName}/issues/comments/$id')
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+  Future<bool> deleteComment(RepositorySlug slug, int id) async {
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/issues/comments/$id',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   // TODO: Implement issues events methods: https://developer.github.com/v3/issues/events/
@@ -284,28 +303,36 @@ class IssuesService extends Service {
   /// API docs: https://developer.github.com/v3/issues/labels/#create-a-label
   Future<IssueLabel> createLabel(
       RepositorySlug slug, String name, String color) {
-    return github.postJSON('/repos/${slug.fullName}/labels',
-        body: GitHubJson.encode({'name': name, 'color': color}),
-        convert: (i) => IssueLabel.fromJson(i));
+    return github.postJSON(
+      '/repos/${slug.fullName}/labels',
+      body: GitHubJson.encode({'name': name, 'color': color}),
+      statusCode: StatusCodes.CREATED,
+      convert: (i) => IssueLabel.fromJson(i),
+    );
   }
 
   /// Edits a label.
   ///
   /// API docs: https://developer.github.com/v3/issues/labels/#update-a-label
   Future<IssueLabel> editLabel(RepositorySlug slug, String name, String color) {
-    return github.postJSON('/repos/${slug.fullName}/labels/$name',
-        body: GitHubJson.encode({'name': name, 'color': color}),
-        convert: (i) => IssueLabel.fromJson(i));
+    return github.postJSON(
+      '/repos/${slug.fullName}/labels/$name',
+      body: GitHubJson.encode({'name': name, 'color': color}),
+      statusCode: StatusCodes.OK,
+      convert: (i) => IssueLabel.fromJson(i),
+    );
   }
 
   /// Deletes a label.
   ///
   /// API docs: https://developer.github.com/v3/issues/labels/#delete-a-label
   Future<bool> deleteLabel(RepositorySlug slug, String name) async {
-    final response =
-        await github.request('DELETE', '/repos/${slug.fullName}/labels/$name');
-
-    return response.statusCode == StatusCodes.NO_CONTENT;
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/labels/$name',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Lists all labels for an issue.
@@ -322,10 +349,14 @@ class IssuesService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/issues/labels/#add-labels-to-an-issue
   Future<List<IssueLabel>> addLabelsToIssue(
-      RepositorySlug slug, int issueNumber, List<String> labels) {
+    RepositorySlug slug,
+    int issueNumber,
+    List<String> labels,
+  ) {
     return github.postJSON<List<dynamic>, List<IssueLabel>>(
       '/repos/${slug.fullName}/issues/$issueNumber/labels',
       body: GitHubJson.encode(labels),
+      statusCode: StatusCodes.OK,
       convert: (input) => input
           .cast<Map<String, dynamic>>()
           .map((i) => IssueLabel.fromJson(i))
@@ -339,12 +370,14 @@ class IssuesService extends Service {
   Future<List<IssueLabel>> replaceLabelsForIssue(
       RepositorySlug slug, int issueNumber, List<String> labels) {
     return github
-        .request('PUT', '/repos/${slug.fullName}/issues/$issueNumber/labels',
-            body: GitHubJson.encode(labels))
-        .then((response) {
-      return jsonDecode(response.body)
-          .map((Map<String, dynamic> it) => IssueLabel.fromJson(it));
-    });
+        .request(
+          'PUT',
+          '/repos/${slug.fullName}/issues/$issueNumber/labels',
+          body: GitHubJson.encode(labels),
+          statusCode: StatusCodes.OK,
+        )
+        .then((response) => jsonDecode(response.body)
+            .map((Map<String, dynamic> it) => IssueLabel.fromJson(it)));
   }
 
   /// Removes a label for an issue.
@@ -352,19 +385,27 @@ class IssuesService extends Service {
   /// API docs: https://developer.github.com/v3/issues/labels/#remove-a-label-from-an-issue
   Future<bool> removeLabelForIssue(
       RepositorySlug slug, int issueNumber, String label) async {
-    final response = await github.request(
-        'DELETE', '/repos/${slug.fullName}/issues/$issueNumber/labels/$label');
-
-    return response.statusCode == StatusCodes.OK;
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/issues/$issueNumber/labels/$label',
+      statusCode: StatusCodes.OK,
+    );
+    return true;
   }
 
   /// Removes all labels for an issue.
   ///
   /// API docs: https://developer.github.com/v3/issues/labels/#remove-all-labels-from-an-issue
-  Future<bool> removeAllLabelsForIssue(RepositorySlug slug, int issueNumber) {
-    return github
-        .request('DELETE', '/repos/${slug.fullName}/issues/$issueNumber/labels')
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+  Future<bool> removeAllLabelsForIssue(
+    RepositorySlug slug,
+    int issueNumber,
+  ) async {
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/issues/$issueNumber/labels',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   // TODO: Implement listLabelsByMilestone: https://developer.github.com/v3/issues/labels/#get-labels-for-every-issue-in-a-milestone
@@ -383,10 +424,15 @@ class IssuesService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/issues/milestones/#create-a-milestone
   Future<Milestone> createMilestone(
-      RepositorySlug slug, CreateMilestone request) {
-    return github.postJSON('/repos/${slug.fullName}/milestones',
-        body: GitHubJson.encode(request),
-        convert: (i) => Milestone.fromJson(i));
+    RepositorySlug slug,
+    CreateMilestone request,
+  ) {
+    return github.postJSON(
+      '/repos/${slug.fullName}/milestones',
+      statusCode: StatusCodes.CREATED,
+      body: GitHubJson.encode(request),
+      convert: (i) => Milestone.fromJson(i),
+    );
   }
 
   // TODO: Implement editMilestone: https://developer.github.com/v3/issues/milestones/#update-a-milestone
@@ -394,9 +440,12 @@ class IssuesService extends Service {
   /// Deletes a milestone.
   ///
   /// API docs: https://developer.github.com/v3/issues/milestones/#delete-a-milestone
-  Future<bool> deleteMilestone(RepositorySlug slug, int number) {
-    return github
-        .request('DELETE', '/repos/${slug.fullName}/milestones/$number')
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+  Future<bool> deleteMilestone(RepositorySlug slug, int number) async {
+    await github.request(
+      'DELETE',
+      '/repos/${slug.fullName}/milestones/$number',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 }
diff --git a/lib/src/common/misc_service.dart b/lib/src/common/misc_service.dart
index 9ccc289b..cd9e873c 100644
--- a/lib/src/common/misc_service.dart
+++ b/lib/src/common/misc_service.dart
@@ -25,16 +25,21 @@ class MiscService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/gitignore/#listing-available-templates
   Future<List<String>> listGitignoreTemplates() {
-    return github.getJSON('/gitignore/templates') as Future<List<String>>;
+    return github.getJSON(
+      '/gitignore/templates',
+      statusCode: StatusCodes.OK,
+    ) as Future<List<String>>;
   }
 
   /// Gets a .gitignore template by [name].
   /// All template names can be fetched using [listGitignoreTemplates].
   ///
   /// API docs: https://developer.github.com/v3/gitignore/#get-a-single-template
-  Future<GitignoreTemplate> getGitignoreTemplate(String name) =>
-      github.getJSON('/gitignore/templates/$name',
-          convert: (i) => GitignoreTemplate.fromJson(i));
+  Future<GitignoreTemplate> getGitignoreTemplate(String name) => github.getJSON(
+        '/gitignore/templates/$name',
+        convert: (i) => GitignoreTemplate.fromJson(i),
+        statusCode: StatusCodes.OK,
+      );
 
   /// Renders Markdown from the [input].
   ///
@@ -42,15 +47,22 @@ class MiscService extends Service {
   /// [context] is the repository context. Only take into account when [mode] is 'gfm'.
   ///
   /// API docs: https://developer.github.com/v3/markdown/#render-an-arbitrary-markdown-document
-  Future<String> renderMarkdown(String input,
-      {String mode = 'markdown', String context}) {
-    return github
-        .request('POST', '/markdown',
-            body: GitHubJson.encode(
-                {'text': input, 'mode': mode, 'context': context}))
-        .then((response) {
-      return response.body;
-    });
+  Future<String> renderMarkdown(
+    String input, {
+    String mode = 'markdown',
+    String context,
+  }) async {
+    final response = await github.request(
+      'POST',
+      '/markdown',
+      body: GitHubJson.encode({
+        'text': input,
+        'mode': mode,
+        'context': context,
+      }),
+      statusCode: StatusCodes.OK,
+    );
+    return response.body;
   }
 
   // TODO: Implement renderMarkdownRaw: https://developer.github.com/v3/markdown/#render-a-markdown-document-in-raw-mode
@@ -61,9 +73,9 @@ class MiscService extends Service {
   ///
   /// API docs: https://developer.github.com/v3/rate_limit/
   Future<RateLimit> getRateLimit() {
-    return github.request('GET', '/').then((response) {
-      return RateLimit.fromHeaders(response.headers);
-    });
+    return github
+        .request('GET', '/', statusCode: StatusCodes.OK)
+        .then((response) => RateLimit.fromHeaders(response.headers));
   }
 
   /// Gets the GitHub API Status.
@@ -79,16 +91,17 @@ class MiscService extends Service {
       params['s'] = text;
     }
 
-    return github.request('GET', '/octocat', params: params).then((response) {
-      return response.body;
-    });
+    return github
+        .request('GET', '/octocat', params: params, statusCode: StatusCodes.OK)
+        .then((response) => response.body);
   }
 
   /// Returns an ASCII Octocat with some wisdom.
   Future<String> getWisdom() => getOctocat();
 
-  Future<String> getZen() =>
-      github.request('GET', '/zen').then((response) => response.body);
+  Future<String> getZen() => github
+      .request('GET', '/zen', statusCode: StatusCodes.OK)
+      .then((response) => response.body);
 }
 
 class Octocat {
diff --git a/lib/src/common/orgs_service.dart b/lib/src/common/orgs_service.dart
index 3f3dfa6c..53863b15 100644
--- a/lib/src/common/orgs_service.dart
+++ b/lib/src/common/orgs_service.dart
@@ -125,23 +125,28 @@ class OrganizationsService extends Service {
     );
   }
 
-  /// Deletes the team specified by the [teamId]
+  /// Deletes the team specified by the [teamSlug]
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#delete-team
-  Future<bool> deleteTeam(int teamId) {
-    return github.request('DELETE', '/teams/$teamId').then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> deleteTeam(String org, String teamSlug) async {
+    await github.request(
+      'DELETE',
+      'orgs/$org/teams/$teamSlug',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Lists the team members of the team with [teamId].
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#list-team-members
+  @deprecated
   Stream<TeamMember> listTeamMembers(int teamId) {
     return PaginationHelper(github).objects(
         'GET', '/teams/$teamId/members', (i) => TeamMember.fromJson(i));
   }
 
+  @deprecated
   Future<bool> getTeamMemberStatus(int teamId, String user) {
     return github.getJSON('/teams/$teamId/memberships/$user').then((json) {
       return json['state'];
@@ -151,6 +156,7 @@ class OrganizationsService extends Service {
   /// Returns the membership status for a user in a team.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#get-team-membership
+  @deprecated
   Future<TeamMembershipState> getTeamMembership(int teamId, String user) {
     final completer = Completer<TeamMembershipState>();
 
@@ -175,6 +181,7 @@ class OrganizationsService extends Service {
   /// Invites a user to the specified team.
   ///
   /// API docs: https://developer.github.com/v3/teams/members/#add-or-update-team-membership
+  @deprecated
   Future<TeamMembershipState> addTeamMembership(int teamId, String user) async {
     final response = await github
         .request('PUT', '/teams/$teamId/memberships/$user', statusCode: 200);
@@ -184,6 +191,7 @@ class OrganizationsService extends Service {
   /// Removes a user from the specified team.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#get-team-membership
+  @deprecated
   Future removeTeamMembership(int teamId, String user) {
     return github.request('DELETE', '/teams/$teamId/memberships/$user',
         statusCode: 204);
@@ -192,6 +200,7 @@ class OrganizationsService extends Service {
   /// Lists the repositories that the specified team has access to.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#list-team-repos
+  @deprecated
   Stream<Repository> listTeamRepositories(int teamId) {
     return PaginationHelper(github)
         .objects('GET', '/teams/$teamId/repos', (i) => Repository.fromJson(i));
@@ -200,6 +209,7 @@ class OrganizationsService extends Service {
   /// Checks if a team manages the specified repository.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#get-team-repo
+  @deprecated
   Future<bool> isTeamRepository(int teamId, RepositorySlug slug) {
     return github
         .request('GET', '/teams/$teamId/repos/${slug.fullName}')
@@ -211,6 +221,7 @@ class OrganizationsService extends Service {
   /// Adds a repository to be managed by the specified team.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#add-team-repo
+  @deprecated
   Future<bool> addTeamRepository(int teamId, RepositorySlug slug) {
     return github
         .request('PUT', '/teams/$teamId/repos/${slug.fullName}')
@@ -222,6 +233,7 @@ class OrganizationsService extends Service {
   /// Removes a repository from being managed by the specified team.
   ///
   /// API docs: https://developer.github.com/v3/orgs/teams/#remove-team-repo
+  @deprecated
   Future<bool> removeTeamRepository(int teamId, RepositorySlug slug) {
     return github
         .request('DELETE', '/teams/$teamId/repos/${slug.fullName}')
diff --git a/lib/src/common/pulls_service.dart b/lib/src/common/pulls_service.dart
index ddc51b22..58104b03 100644
--- a/lib/src/common/pulls_service.dart
+++ b/lib/src/common/pulls_service.dart
@@ -53,17 +53,22 @@ class PullRequestsService extends Service {
       '/repos/${slug.fullName}/pulls',
       convert: (i) => PullRequest.fromJson(i),
       body: GitHubJson.encode(request),
-      preview: request.draft
-          ? 'application/vnd.github.shadow-cat-preview+json'
-          : null,
+      preview: 'application/vnd.github.sailor-v-preview+json',
+      statusCode: StatusCodes.CREATED,
     );
   }
 
   /// Edit a pull request.
   ///
   /// API docs: https://developer.github.com/v3/pulls/#update-a-pull-request
-  Future<PullRequest> edit(RepositorySlug slug, int number,
-      {String title, String body, String state, String base}) {
+  Future<PullRequest> edit(
+    RepositorySlug slug,
+    int number, {
+    String title,
+    String body,
+    String state,
+    String base,
+  }) {
     final map = <String, dynamic>{};
     putValue('title', title, map);
     putValue('body', body, map);
@@ -71,12 +76,14 @@ class PullRequestsService extends Service {
     putValue('base', base, map);
 
     return github
-        .request('POST', '/repos/${slug.fullName}/pulls/$number',
-            body: GitHubJson.encode(map))
-        .then((response) {
-      return PullRequest.fromJson(
-          jsonDecode(response.body) as Map<String, dynamic>);
-    });
+        .request(
+          'PATCH',
+          '/repos/${slug.fullName}/pulls/$number',
+          body: GitHubJson.encode(map),
+          statusCode: StatusCodes.OK,
+        )
+        .then((response) => PullRequest.fromJson(
+            jsonDecode(response.body) as Map<String, dynamic>));
   }
 
   /// Lists the commits in a pull request.
@@ -99,12 +106,13 @@ class PullRequestsService extends Service {
         (i) => PullRequestFile.fromJson(i));
   }
 
-  Future<bool> isMerged(RepositorySlug slug, int number) {
-    return github
-        .request('GET', '/repos/${slug.fullName}/pulls/$number/merge')
-        .then((response) {
-      return response.statusCode == 204;
-    });
+  Future<bool> isMerged(RepositorySlug slug, int number) async {
+    await github.request(
+      'GET',
+      '/repos/${slug.fullName}/pulls/$number/merge',
+      statusCode: StatusCodes.NO_CONTENT,
+    );
+    return true;
   }
 
   /// Merge a pull request (Merge Button).
@@ -122,12 +130,14 @@ class PullRequestsService extends Service {
     }
 
     return github
-        .request('PUT', '/repos/${slug.fullName}/pulls/$number/merge',
-            body: GitHubJson.encode(json))
-        .then((response) {
-      return PullRequestMerge.fromJson(
-          jsonDecode(response.body) as Map<String, dynamic>);
-    });
+        .request(
+          'PUT',
+          '/repos/${slug.fullName}/pulls/$number/merge',
+          body: GitHubJson.encode(json),
+          statusCode: StatusCodes.OK,
+        )
+        .then((response) => PullRequestMerge.fromJson(
+            jsonDecode(response.body) as Map<String, dynamic>));
   }
 
   /// Lists all comments on the specified pull request.
diff --git a/lib/src/common/repos_service.dart b/lib/src/common/repos_service.dart
index ee2860b5..9a6bc608 100644
--- a/lib/src/common/repos_service.dart
+++ b/lib/src/common/repos_service.dart
@@ -103,23 +103,22 @@ class RepositoriesService extends Service {
   /// repository will be created under that organization. If no [org] is
   /// specified, it will be created for the authenticated user.
   ///
-  /// API docs: https://developer.github.com/v3/repos/#create
-  Future<Repository> createRepository(CreateRepository repository,
-      {String org}) async {
+  /// * API docs: https://developer.github.com/v3/repos/#create-a-repository-for-the-authenticated-user
+  /// * API docs:
+  Future<Repository> createRepository(
+    CreateRepository repository, {
+    String org,
+  }) async {
     ArgumentError.checkNotNull(repository);
-    if (org != null) {
-      return github.postJSON<Map<String, dynamic>, TeamRepository>(
-        '/orgs/$org/repos',
-        body: GitHubJson.encode(repository),
-        convert: (i) => TeamRepository.fromJson(i),
-      );
-    } else {
-      return github.postJSON<Map<String, dynamic>, Repository>(
-        '/user/repos',
-        body: GitHubJson.encode(repository),
-        convert: (i) => Repository.fromJson(i),
-      );
-    }
+    final isOrg = org != null;
+    final path = isOrg ? '/orgs/$org/repos' : '/user/repos';
+    return github.postJSON<Map<String, dynamic>, Repository>(
+      path,
+      body: GitHubJson.encode(repository),
+      convert: (i) =>
+          isOrg ? TeamRepository.fromJson(i) : Repository.fromJson(i),
+      statusCode: StatusCodes.CREATED,
+    );
   }
 
   Future<LicenseDetails> getLicense(RepositorySlug slug) async {
@@ -127,6 +126,7 @@ class RepositoriesService extends Service {
     return github.getJSON<Map<String, dynamic>, LicenseDetails>(
       '/repos/${slug.owner}/${slug.name}/license',
       convert: (json) => LicenseDetails.fromJson(json),
+      statusCode: StatusCodes.OK,
     );
   }
 
@@ -272,6 +272,7 @@ class RepositoriesService extends Service {
     return github.getJSON<Map<String, dynamic>, Branch>(
       '/repos/${slug.fullName}/branches/$branch',
       convert: (i) => Branch.fromJson(i),
+      statusCode: StatusCodes.OK,
     );
   }
 
@@ -507,6 +508,7 @@ class RepositoriesService extends Service {
     return github.getJSON<Map<String, dynamic>, GitHubComparison>(
       '/repos/${slug.fullName}/compare/$refBase...$refHead',
       convert: (j) => GitHubComparison.fromJson(j),
+      statusCode: StatusCodes.OK,
     );
   }
 
@@ -567,6 +569,7 @@ class RepositoriesService extends Service {
 
     return github.getJSON(
       url,
+      statusCode: StatusCodes.OK,
       convert: (input) {
         final contents = RepositoryContents();
         if (input is Map) {
@@ -589,15 +592,18 @@ class RepositoriesService extends Service {
 
   /// Creates a new file in a repository.
   ///
-  /// API docs: https://developer.github.com/v3/repos/contents/#create-a-file
+  /// API docs: https://developer.github.com/v3/repos/contents/#create-or-update-a-file
   Future<ContentCreation> createFile(
-      RepositorySlug slug, CreateFile file) async {
+    RepositorySlug slug,
+    CreateFile file,
+  ) async {
     ArgumentError.checkNotNull(slug);
     ArgumentError.checkNotNull(file);
     final response = await github.request(
       'PUT',
       '/repos/${slug.fullName}/contents/${file.path}',
       body: GitHubJson.encode(file),
+      statusCode: StatusCodes.CREATED,
     );
     return ContentCreation.fromJson(
         jsonDecode(response.body) as Map<String, dynamic>);
@@ -605,10 +611,15 @@ class RepositoriesService extends Service {
 
   /// Updates the specified file.
   ///
-  /// API docs: https://developer.github.com/v3/repos/contents/#update-a-file
-  Future<ContentCreation> updateFile(RepositorySlug slug, String path,
-      String message, String content, String sha,
-      {String branch}) async {
+  /// API docs: https://developer.github.com/v3/repos/contents/#create-or-update-a-file
+  Future<ContentCreation> updateFile(
+    RepositorySlug slug,
+    String path,
+    String message,
+    String content,
+    String sha, {
+    String branch,
+  }) async {
     ArgumentError.checkNotNull(slug);
     ArgumentError.checkNotNull(path);
     final map = createNonNullMap({
@@ -621,6 +632,7 @@ class RepositoriesService extends Service {
       'PUT',
       '/repos/${slug.fullName}/contents/$path',
       body: GitHubJson.encode(map),
+      statusCode: StatusCodes.CREATED,
     );
     return ContentCreation.fromJson(
         jsonDecode(response.body) as Map<String, dynamic>);
@@ -683,6 +695,7 @@ class RepositoriesService extends Service {
       '/repos/${slug.fullName}/forks',
       body: GitHubJson.encode(fork),
       convert: (i) => Repository.fromJson(i),
+      statusCode: StatusCodes.ACCEPTED,
     );
   }
 
@@ -707,6 +720,7 @@ class RepositoriesService extends Service {
     return github.getJSON<Map<String, dynamic>, Hook>(
       '/repos/${slug.fullName}/hooks/$id',
       convert: (i) => Hook.fromJson(i)..repoName = slug.fullName,
+      statusCode: StatusCodes.OK,
     );
   }
 
@@ -720,6 +734,7 @@ class RepositoriesService extends Service {
       '/repos/${slug.fullName}/hooks',
       convert: (i) => Hook.fromJson(i)..repoName = slug.fullName,
       body: GitHubJson.encode(hook),
+      statusCode: StatusCodes.CREATED,
     );
   }
 
@@ -963,6 +978,7 @@ class RepositoriesService extends Service {
     return github.getJSON<Map<String, dynamic>, Release>(
       '/repos/${slug.fullName}/releases/$id',
       convert: (i) => Release.fromJson(i),
+      statusCode: StatusCodes.OK,
     );
   }
 
@@ -999,10 +1015,11 @@ class RepositoriesService extends Service {
     ArgumentError.checkNotNull(slug);
     ArgumentError.checkNotNull(createRelease);
     final release = await github.postJSON<Map<String, dynamic>, Release>(
-        '/repos/${slug.fullName}/releases',
-        convert: (i) => Release.fromJson(i),
-        body: GitHubJson.encode(createRelease.toJson()),
-        statusCode: StatusCodes.CREATED);
+      '/repos/${slug.fullName}/releases',
+      convert: (i) => Release.fromJson(i),
+      body: GitHubJson.encode(createRelease.toJson()),
+      statusCode: StatusCodes.CREATED,
+    );
     if (release.hasErrors) {
       final alreadyExistsErrorCode = release.errors.firstWhere(
         (error) => error['code'] == 'already_exists',
@@ -1149,13 +1166,15 @@ class RepositoriesService extends Service {
     for (final createReleaseAsset in createReleaseAssets) {
       final headers = {'Content-Type': createReleaseAsset.contentType};
       final releaseAsset = await github.postJSON(
-          release.getUploadUrlFor(
-            createReleaseAsset.name,
-            createReleaseAsset.label,
-          ),
-          headers: headers,
-          body: createReleaseAsset.assetData,
-          convert: (i) => ReleaseAsset.fromJson(i));
+        release.getUploadUrlFor(
+          createReleaseAsset.name,
+          createReleaseAsset.label,
+        ),
+        headers: headers,
+        body: createReleaseAsset.assetData,
+        convert: (i) => ReleaseAsset.fromJson(i),
+        statusCode: StatusCodes.CREATED,
+      );
       releaseAssets.add(releaseAsset);
     }
     return releaseAssets;
@@ -1172,8 +1191,12 @@ class RepositoriesService extends Service {
   ) async {
     ArgumentError.checkNotNull(slug);
     final path = '/repos/${slug.fullName}/stats/contributors';
-    final response =
-        await github.request('GET', path, headers: {'Accept': v3ApiMimeType});
+    final response = await github.request(
+      'GET',
+      path,
+      headers: {'Accept': v3ApiMimeType},
+      statusCode: StatusCodes.OK,
+    );
 
     if (response.statusCode == StatusCodes.OK) {
       return (jsonDecode(response.body) as List)
@@ -1264,6 +1287,7 @@ class RepositoriesService extends Service {
       '/repos/${slug.fullName}/statuses/$ref',
       body: GitHubJson.encode(request),
       convert: (i) => RepositoryStatus.fromJson(i),
+      statusCode: StatusCodes.OK,
     );
   }
 
diff --git a/lib/src/common/url_shortener_service.dart b/lib/src/common/url_shortener_service.dart
index 950b0844..8309cd5d 100644
--- a/lib/src/common/url_shortener_service.dart
+++ b/lib/src/common/url_shortener_service.dart
@@ -20,7 +20,7 @@ class UrlShortenerService extends Service {
     }
 
     return github
-        .request('POST', 'http://git.io/', params: params)
+        .request('POST', 'http://git.io/', params: params, statusCode: null)
         .then((response) {
       if (response.statusCode != StatusCodes.CREATED) {
         throw GitHubError(github, 'Failed to create shortened url!');
diff --git a/lib/src/common/users_service.dart b/lib/src/common/users_service.dart
index e6e3b829..59047738 100644
--- a/lib/src/common/users_service.dart
+++ b/lib/src/common/users_service.dart
@@ -15,8 +15,11 @@ class UsersService extends Service {
   /// Fetches the user specified by [name].
   ///
   /// API docs: https://developer.github.com/v3/users/#get-a-single-user
-  Future<User> getUser(String name) =>
-      github.getJSON('/users/$name', convert: (i) => User.fromJson(i));
+  Future<User> getUser(String name) => github.getJSON(
+        '/users/$name',
+        convert: (i) => User.fromJson(i),
+        statusCode: StatusCodes.OK,
+      );
 
   /// Updates the Current User.
   ///
@@ -70,9 +73,14 @@ class UsersService extends Service {
       convert: (i) => CurrentUser.fromJson(i));
 
   /// Checks if a user exists.
-  Future<bool> isUser(String name) => github
-      .request('GET', '/users/$name')
-      .then((resp) => resp.statusCode == StatusCodes.OK);
+  Future<bool> isUser(String name) async {
+    try {
+      await github.request('GET', '/users/$name', statusCode: StatusCodes.OK);
+      return true;
+    } on NotFound {
+      return false;
+    }
+  }
 
   // TODO: Implement editUser: https://developer.github.com/v3/users/#update-the-authenticated-user
 

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