diff --git a/src/test/java/eu/ztsh/wymiana/WireMockExtension.java b/src/test/java/eu/ztsh/wymiana/WireMockExtension.java
index 7a7904f..99ebc73 100644
--- a/src/test/java/eu/ztsh/wymiana/WireMockExtension.java
+++ b/src/test/java/eu/ztsh/wymiana/WireMockExtension.java
@@ -14,7 +14,10 @@ public class WireMockExtension implements BeforeAllCallback, AfterEachCallback,
 
     public static void response(String endpoint, int status, String body) {
         configureFor(38080);
-        stubFor(get(urlEqualTo(endpoint)).willReturn(WireMock.status(status).withBody(body)));
+        stubFor(get(urlEqualTo(endpoint))
+            .willReturn(WireMock.status(status)
+                .withHeader("Content-Type", "application/json")
+                .withBody(body)));
     }
 
     public static void verifyGet(int count, String url) {
@@ -34,6 +37,8 @@ public class WireMockExtension implements BeforeAllCallback, AfterEachCallback,
     @Override
     public void afterEach(ExtensionContext extensionContext) throws Exception {
         wireMockServer.listAllStubMappings().getMappings().forEach(wireMockServer::removeStub);
+        wireMockServer.findAllUnmatchedRequests().forEach(System.out::println);
+        wireMockServer.resetRequests();
     }
 
     @Override