Use DELETE method instead of GET for key removal

src/app.js

@@ -51,6 +51,9 @@ router.post('/api/v1/key', function *() {
 router.get('/api/v1/key', function *() {
   yield rest.query(this);
 });
+router.del('/api/v1/key', function *() {
+  yield rest.remove(this);
+});
 
 // Redirect all http traffic to https
 app.use(function *(next) {

src/route/rest.js

@@ -56,7 +56,7 @@ class REST {
    */
   *query(ctx) {
     let op = ctx.query.op;
-    if (this[op]) {
+    if (op === 'verify' || op ===  'verifyRemove') {
       return yield this[op](ctx); // delegate operation
     }
     // do READ if no 'op' provided