diff --git a/include/security_headers_middleware.hpp b/include/security_headers_middleware.hpp
index 7e84543..19644f4 100644
--- a/include/security_headers_middleware.hpp
+++ b/include/security_headers_middleware.hpp
@@ -4,12 +4,45 @@
 #include <crow/http_response.h>
 
 namespace crow {
+static const std::string strict_transport_security_key =
+    "Strict-Transport-Security";
+static const std::string strict_transport_security_value =
+    "max-age=31536000; includeSubdomains; preload";
+
+static const std::string ua_compatability_key = "X-UA-Compatible";
+static const std::string ua_compatability_value = "IE=11";
+
+static const std::string xframe_key = "X-Frame-Options";
+static const std::string xframe_value = "DENY";
+
+static const std::string xss_key = "X-XSS-Protection";
+static const std::string xss_value = "1; mode=block";
+
+static const std::string content_security_key = "X-Content-Security-Policy";
+static const std::string content_security_value = "default-src 'self'";
+
 
 struct SecurityHeadersMiddleware {
   struct context {};
 
-  void before_handle(crow::request& req, response& res, context& ctx);
+  void before_handle(crow::request& req,
+                                                       response& res,
+                                                       context& ctx) {}
 
-  void after_handle(request& req, response& res, context& ctx);
+  void after_handle(request& /*req*/,
+                                                      response& res,
+                                                      context& ctx) {
+    /*
+     TODO(ed) these should really check content types.  for example,
+     X-UA-Compatible header doesn't make sense when retrieving a JSON or
+     javascript file.  It doesn't hurt anything, it's just ugly.
+     */
+    res.add_header(strict_transport_security_key,
+                   strict_transport_security_value);
+    res.add_header(ua_compatability_key, ua_compatability_value);
+    res.add_header(xframe_key, xframe_value);
+    res.add_header(xss_key, xss_value);
+    res.add_header(content_security_key, content_security_value);
+  }
 };
 }
\ No newline at end of file