Switch back interceptor to simple interface

spring-graphql-web/src/main/java/org/springframework/graphql/DefaultGraphQLInterceptor.java

@@ -1,5 +0,0 @@
-package org.springframework.graphql;
-
-public class DefaultGraphQLInterceptor implements GraphQLInterceptor {
-
-}

spring-graphql-web/src/main/java/org/springframework/graphql/GraphQLInterceptor.java

@@ -2,29 +2,11 @@ package org.springframework.graphql;
 
 import graphql.ExecutionInput;
 import graphql.ExecutionResult;
+
 import org.springframework.http.HttpHeaders;
-import org.springframework.util.MultiValueMap;
-import reactor.core.publisher.Mono;
 
 public interface GraphQLInterceptor {
+	ExecutionInput preHandle(ExecutionInput input, HttpHeaders headers);
 
-    default Mono<ExecutionInput> preHandle(ExecutionInput input,
-                                           HttpHeaders headers,
-                                           MultiValueMap<String, String> requestParams) {
-        return Mono.just(input);
-    }
-
-    default Mono<ExecutionResult> postHandle(ExecutionResult result,
-                                             HttpHeaders httpHeaders,
-                                             MultiValueMap<String, String> requestParams) {
-        return Mono.just(result);
-    }
-
-    default Mono<GraphQLHttpResponse> customizeGraphQLHttpResponse(GraphQLHttpResponse graphQLHttpResponse,
-                                                                   ExecutionResult executionResult,
-                                                                   GraphQLHttpRequest graphQLHttpRequest) {
-
-        return Mono.just(graphQLHttpResponse);
-    }
-
+	ExecutionResult postHandle(ExecutionResult result);
 }