diff --git a/example/main.dart b/example/main.dart
index ed8bb393..c5a811a8 100644
--- a/example/main.dart
+++ b/example/main.dart
@@ -1,8 +1,8 @@
-import 'dart:io';
 import 'package:angel_framework/angel_framework.dart';
 import 'package:angel_test/angel_test.dart';
 import 'package:angel_validate/angel_validate.dart';
 import 'package:angel_websocket/server.dart';
+import 'package:dart2_constant/io.dart';
 import 'package:test/test.dart';
 
 main() {
@@ -97,7 +97,6 @@ main() {
     test('hasValidBody+hasContentType', () async {
       var res = await client.get('/valid');
       expect(res, hasContentType('application/json'));
-      expect(res, hasContentType(new ContentType('application', 'json')));
       expect(
           res,
           hasValidBody(new Validator({
diff --git a/lib/src/client.dart b/lib/src/client.dart
index 563fa89b..5540111f 100644
--- a/lib/src/client.dart
+++ b/lib/src/client.dart
@@ -1,6 +1,6 @@
 import 'dart:async';
 import 'dart:convert' show Encoding;
-import 'dart:io' show ContentType, Cookie, HttpSession, HttpServer, WebSocket;
+import 'dart:io' show ContentType, Cookie, HttpServer, HttpSession, WebSocket;
 import 'package:dart2_constant/convert.dart';
 import 'package:dart2_constant/io.dart' hide WebSocket;
 import 'package:angel_client/base_angel_client.dart' as client;
@@ -138,8 +138,9 @@ class TestClient extends client.BaseAngelClient {
     Stream<List<int>> stream = rs;
 
     if (autoDecodeGzip != false &&
-        rs.headers['content-encoding']?.contains('gzip') == true)
+        rs.headers['content-encoding']?.contains('gzip') == true) {
       stream = stream.transform(gzip.decoder);
+    }
 
     return new StreamedResponse(stream, rs.statusCode,
         contentLength: rs.contentLength,
diff --git a/lib/src/matchers.dart b/lib/src/matchers.dart
index 16c09630..fc0f62a7 100644
--- a/lib/src/matchers.dart
+++ b/lib/src/matchers.dart
@@ -133,7 +133,7 @@ class _HasHeader extends Matcher {
             .matches(item.headers.keys, matchState);
       } else {
         if (!item.headers.containsKey(key.toLowerCase())) return false;
-        Iterable v = value is Iterable ? value : [value];
+        Iterable v = value is Iterable ? (value as Iterable) : [value];
         return v
             .map((x) => x.toString())
             .every(item.headers[key.toLowerCase()].split(',').contains);
diff --git a/test/simple_test.dart b/test/simple_test.dart
index fd96f841..2f3e5f11 100644
--- a/test/simple_test.dart
+++ b/test/simple_test.dart
@@ -1,8 +1,9 @@
-import 'dart:io';
+import 'dart:io' show ContentType;
 import 'package:angel_framework/angel_framework.dart';
 import 'package:angel_test/angel_test.dart';
 import 'package:angel_validate/angel_validate.dart';
 import 'package:angel_websocket/server.dart';
+import 'package:dart2_constant/io.dart';
 import 'package:test/test.dart';
 
 main() {
@@ -112,6 +113,7 @@ main() {
 
     test('gzip decode', () async {
       var res = await client.get('/gzip');
+      print('Body: ${res.body}');
       expect(res, hasHeader('content-encoding', 'gzip'));
       expect(res, hasBody('Poop'));
     });