Fix UnsupportedMediaType in samples

samples/06.using-cards/app.py

@@ -59,7 +59,7 @@ async def on_error(context: TurnContext, error: Exception):
 @APP.route("/api/messages", methods=["POST"])
 def messages():
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = request.json
     else:
         return Response(status=415)

samples/13.core-bot/app.py

@@ -46,7 +46,7 @@
 @APP.route("/api/messages", methods=["POST"])
 def messages():
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = request.json
     else:
         return Response(status=415)

samples/21.corebot-app-insights/main.py

@@ -62,7 +62,7 @@ async def on_error(context: TurnContext, error: Exception):
 @APP.route("/api/messages", methods=["POST"])
 def messages():
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = request.json
     else:
         return Response(status=415)

samples/45.state-management/app.py

@@ -57,7 +57,7 @@ async def on_error(context: TurnContext, error: Exception):
 @APP.route("/api/messages", methods=["POST"])
 def messages():
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = request.json
     else:
         return Response(status=415)

samples/experimental/101.corebot-bert-bidaf/bot/main.py

@@ -39,7 +39,7 @@
 @APP.route("/api/messages", methods=["POST"])
 def messages():
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = request.json
     else:
         return Response(status=415)

samples/python_django/13.core-bot/bots/views.py

@@ -24,7 +24,7 @@ def home():
 
 def messages(request):
     """Main bot message handler."""
-    if request.headers["Content-Type"] == "application/json":
+    if "application/json" in request.headers["Content-Type"]:
         body = json.loads(request.body.decode("utf-8"))
     else:
         return HttpResponse(status=415)