Merge pull request #1068 from x-way/api_json_contenttype

Set Content-Type to json for /api/v3/* (fix #1056)

src/main/scala/gitbucket/core/controller/ControllerBase.scala

@@ -30,6 +30,10 @@ abstract class ControllerBase extends ScalatraFilter
 
   implicit val jsonFormats = gitbucket.core.api.JsonFormat.jsonFormats
 
+  before("/api/v3/*") {
+    contentType = formats("json")
+  }
+
 // TODO Scala 2.11
 //  // Don't set content type via Accept header.
 //  override def format(implicit request: HttpServletRequest) = ""