fix ctx.http inject and incorrect injects

src/registrar.ts

@@ -289,12 +289,16 @@ export class Registrar<Ctx extends Context> {
             if (!name) {
               continue;
             }
+            const proto = Reflect.getMetadata('design:type', this, key);
             Object.defineProperty(this, key, {
               enumerable: true,
               configurable: true,
               get: () => {
                 const val = this.__ctx[name];
-                if (typeof val === 'function') {
+                if (
+                  typeof val === 'function' &&
+                  (proto === String || proto === Object)
+                ) {
                   return (...args: any[]) => this.__ctx[name](...args);
                 } else {
                   return val;