add

+/* Include the required headers from httpd */
+#include "httpd.h"
+#include "http_core.h"
+#include "http_protocol.h"
+#include "http_request.h"
+
+/* Define prototypes of our functions in this module */
+static void register_hooks(apr_pool_t *pool);
+static int example_handler(request_rec *r);
+
+/* Define our module as an entity and assign a function for registering hooks  */
+
+module AP_MODULE_DECLARE_DATA   example_module =
+{
+    STANDARD20_MODULE_STUFF,
+    NULL,            // Per-directory configuration handler
+    NULL,            // Merge handler for per-directory configurations
+    NULL,            // Per-server configuration handler
+    NULL,            // Merge handler for per-server configurations
+    NULL,            // Any directives we may have for httpd
+    register_hooks   // Our hook registering function
+};
+
+
+/* register_hooks: Adds a hook to the httpd process */
+static void register_hooks(apr_pool_t *pool) 
+{
+    
+    /* Hook the request handler */
+    ap_hook_handler(example_handler, NULL, NULL, APR_HOOK_LAST);
+}
+
+/* The handler function for our module.
+ * This is where all the fun happens!
+ */
+
+static int example_handler(request_rec *r)
+{
+    /* First off, we need to check if this is a call for the "example" handler.
+     * If it is, we accept it and do our things, it not, we simply return DECLINED,
+     * and Apache will try somewhere else.
+     */
+    if (!r->handler || strcmp(r->handler, "example-handler")) return (DECLINED);
+    
+    // The first thing we will do is write a simple "Hello, world!" back to the client.
+    ap_rputs("Hello, world!<br/>", r);
+    return OK;
+}