diff --git a/ref-test/main.py b/ref-test/main.py
index 9729e0a..c1f0efe 100644
--- a/ref-test/main.py
+++ b/ref-test/main.py
@@ -8,6 +8,7 @@ from pymongo import MongoClient
 from pymongo.errors import ConnectionFailure
 from flask_wtf.csrf import CSRFProtect, CSRFError
 from flask_mail import Mail
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 from common.security import check_keyfile_exists, generate_keyfile
 import config
@@ -70,6 +71,8 @@ def create_app():
     Bootstrap(app)
     csrf = CSRFProtect(app)
 
+    app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
+
     return app
 
 app = create_app()
diff --git a/ref-test/quiz/templates/quiz/components/og-meta.html b/ref-test/quiz/templates/quiz/components/og-meta.html
index ef31c74..5c63bca 100644
--- a/ref-test/quiz/templates/quiz/components/og-meta.html
+++ b/ref-test/quiz/templates/quiz/components/og-meta.html
@@ -2,12 +2,12 @@
 <meta property="og:locale" content="en_UK" />
 <meta property="og:type" content="website" />
 <meta property="og:description" content="A web app for taking the Scottish Korfball Association Refereeing Theory Exam on-line." />
-<meta property="og:url" content="{{ url_for(request.endpoint, **request.view_args, _external = True) }}" />
+<meta property="og:url" content="{{ url_for(request.endpoint, _external = True, **request.view_args) }}" />
 <meta property="og:site_name" content="Scottish Korfball Association Referee Theory Exam" />
 <meta property="og:image" content="{{ url_for('static', filename='favicon.png', _external = True) }}" />
 <meta property="og:image:alt" content="Logo of the SKA Refereeing Exam App" />
-<meta property="og:image:width" content="1024" />
-<meta property="og:image:height" content="1024" />
+<meta property="og:image:width" content="512" />
+<meta property="og:image:height" content="512" />
 <meta name="twitter:card" content="summary" />
 <meta name="twitter:description" content="A web app for taking the Scottish Korfball Association Refereeing Theory Exam on-line." />
 <meta name="twitter:image" content="{{ url_for('static', filename='favicon.png', _external = True) }}" />