http.RequestOptions.agent can also be a boolean

https://nodejs.org/api/http.html#http_http_request_options_callback

node/node-tests.ts

@@ -226,6 +226,16 @@ module http_tests {
 	});
 
 	var agent: http.Agent = http.globalAgent;
+	
+	http.request({
+		agent: false
+	});
+	http.request({
+		agent: agent
+	});
+	http.request({
+		agent: undefined
+	});
 }
 
 ////////////////////////////////////////////////////

node/node.d.ts

@@ -453,7 +453,7 @@ declare module "http" {
         path?: string;
         headers?: { [key: string]: any };
         auth?: string;
-        agent?: Agent;
+        agent?: Agent|boolean;
     }
 
     export interface Server extends events.EventEmitter {