Reinstate utf8

Author: oliemansm

graphql-java-servlet/src/main/java/graphql/kickstart/servlet/HttpRequestHandler.java

@@ -6,8 +6,8 @@
 
 public interface HttpRequestHandler {
 
-  String APPLICATION_JSON_UTF8 = "application/json";
-  String APPLICATION_EVENT_STREAM_UTF8 = "text/event-stream";
+  String APPLICATION_JSON_UTF8 = "application/json;charset=UTF-8";
+  String APPLICATION_EVENT_STREAM_UTF8 = "text/event-stream;charset=UTF-8";
 
   int STATUS_OK = 200;
   int STATUS_BAD_REQUEST = 400;

graphql-java-servlet/src/test/groovy/graphql/kickstart/servlet/AbstractGraphQLHttpServletSpec.groovy

@@ -26,8 +26,8 @@ class AbstractGraphQLHttpServletSpec extends Specification {
     public static final int STATUS_OK = 200
     public static final int STATUS_BAD_REQUEST = 400
     public static final int STATUS_ERROR = 500
-    public static final String CONTENT_TYPE_JSON_UTF8 = 'application/json'
-    public static final String CONTENT_TYPE_SERVER_SENT_EVENTS = 'text/event-stream'
+    public static final String CONTENT_TYPE_JSON_UTF8 = 'application/json;charset=UTF-8'
+    public static final String CONTENT_TYPE_SERVER_SENT_EVENTS = 'text/event-stream;charset=UTF-8'
 
     @Shared
     ObjectMapper mapper = new ObjectMapper()

graphql-java-servlet/src/test/groovy/graphql/kickstart/servlet/cache/CacheReaderTest.groovy

@@ -64,7 +64,7 @@ class CacheReaderTest extends Specification {
 
         then:
         result
-        1 * response.setContentType("application/json")
+        1 * response.setContentType("application/json;charset=UTF-8")
         1 * response.setStatus(200)
         1 * response.setCharacterEncoding("UTF-8")
         1 * response.setContentLength(3)