Java tutorial
/* * Copyright 2012-2019 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.boot.web.embedded.jetty; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.eclipse.jetty.http.HttpMethod; import org.eclipse.jetty.server.Request; import org.eclipse.jetty.server.handler.HandlerWrapper; import org.eclipse.jetty.server.handler.gzip.GzipHandler; import org.springframework.boot.web.server.Compression; /** * Jetty {@code HandlerWrapper} static factory. * * @author Brian Clozel */ final class JettyHandlerWrappers { private JettyHandlerWrappers() { } static HandlerWrapper createGzipHandlerWrapper(Compression compression) { GzipHandler handler = new GzipHandler(); handler.setMinGzipSize((int) compression.getMinResponseSize().toBytes()); handler.setIncludedMimeTypes(compression.getMimeTypes()); for (HttpMethod httpMethod : HttpMethod.values()) { handler.addIncludedMethods(httpMethod.name()); } if (compression.getExcludedUserAgents() != null) { handler.setExcludedAgentPatterns(compression.getExcludedUserAgents()); } return handler; } static HandlerWrapper createServerHeaderHandlerWrapper(String header) { return new ServerHeaderHandler(header); } /** * {@link HandlerWrapper} to add a custom {@code server} header. */ private static class ServerHeaderHandler extends HandlerWrapper { private static final String SERVER_HEADER = "server"; private final String value; ServerHeaderHandler(String value) { this.value = value; } @Override public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { if (!response.getHeaderNames().contains(SERVER_HEADER)) { response.setHeader(SERVER_HEADER, this.value); } super.handle(target, baseRequest, request, response); } } }