content: /*
   *  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
   *
   *      http://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.
   *
   *  See the NOTICE file distributed with this work for additional
   *  information regarding copyright ownership.
   */
  
  package org.seaborne.delta.server.http;
  
  import java.io.IOException ;
  import java.nio.charset.Charset;
  import java.nio.charset.StandardCharsets ;
  import java.util.List;
  
  import org.apache.jena.riot.WebContent ;
  import org.eclipse.jetty.http.MimeTypes;
  import org.eclipse.jetty.server.Request ;
  import org.eclipse.jetty.server.Response ;
  import org.eclipse.jetty.server.handler.ErrorHandler ;
  import org.eclipse.jetty.util.Callback;
  
  public class HttpErrorHandler extends /*Jetty*/ErrorHandler {
      private static List<Charset> utf8List = List.of(StandardCharsets.UTF_8);
  
      // Only used if ServletOps.responseSendError calls Servlet API response.sendError
      // or a non-Fuseki error occurs.
      public HttpErrorHandler() {}
  
      @Override
      protected boolean generateAcceptableResponse(Request request, Response response, Callback callback, String contentType, List<Charset> charsets, int code, String message, Throwable cause) throws IOException {
          // Fix Jetty GH-10474 : (12.0.0, 12.0.1)
          // ContentType application/json cause illegal state exception
          if ( contentType != null && contentType.equals(WebContent.contentTypeJSON) ) {
              contentType = MimeTypes.Type.TEXT_PLAIN.asString();
              charsets = utf8List;
          }
          //ServletOps.setNoCache(response);
          return super.generateAcceptableResponse(request, response, callback, contentType, utf8List, code, message, cause);
      }
  }
  