diff --git a/connexion/lifecycle.py b/connexion/lifecycle.py
index 0a6c177a1..b86de4e93 100644
--- a/connexion/lifecycle.py
+++ b/connexion/lifecycle.py
@@ -20,7 +20,10 @@ def __init__(self,
         self.json_getter = json_getter
         self.files = files
         self.context = context if context is not None else {}
-        self.content_type = self.headers.get("Content-Type", "")
+
+    @property
+    def content_type(self):
+        return self.headers.get("Content-Type")
 
     @property
     def json(self):
diff --git a/connexion/utils.py b/connexion/utils.py
index f739540d4..67d970545 100644
--- a/connexion/utils.py
+++ b/connexion/utils.py
@@ -118,7 +118,7 @@ def is_form_mimetype(mimetype):
     try:
         mimetype = mimetype.split(";")[0]
         maintype, subtype = mimetype.split('/')  # type: str, str
-    except ValueError:
+    except (ValueError, AttributeError):
         return False
 
     multipart = maintype == 'multipart' and subtype.startswith("form-data")
@@ -133,7 +133,7 @@ def is_json_mimetype(mimetype):
     """
     try:
         maintype, subtype = mimetype.split('/')  # type: str, str
-    except ValueError:
+    except (ValueError, AttributeError):
         return False
     return maintype == 'application' and (subtype == 'json' or subtype.endswith('+json'))