Fixed the build

samples/standalone/dsl/http-server/src/test/resources/contracts/test/MyHttpContract.java

@@ -27,6 +27,7 @@ class MyHttpContract implements Supplier<Contract> {
 			c.request(r -> {
 				r.method(r.GET());
 				r.url("/example");
+				r.body(r.file("request.json"));
 			});
 			c.response(r -> {
 				r.status(r.OK());

samples/standalone/dsl/http-server/src/test/resources/contracts/test/request.json

@@ -0,0 +1 @@
+{ "hello" :  "world" }