// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
package com.cloud.utils;

import org.apache.log4j.Logger;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HttpUtils {

    public static final Logger s_logger = Logger.getLogger(HttpUtils.class);

    public static final String UTF_8 = "UTF-8";
    public static final String RESPONSE_TYPE_JSON = "json";
    public static final String RESPONSE_TYPE_XML = "xml";
    public static final String JSON_CONTENT_TYPE = "text/javascript; charset=UTF-8";
    public static final String XML_CONTENT_TYPE = "text/xml; charset=UTF-8";

    public static void writeHttpResponse(final HttpServletResponse resp, final String response,
                                         final Integer responseCode, final String responseType) {
        try {
            if (RESPONSE_TYPE_JSON.equalsIgnoreCase(responseType)) {
                resp.setContentType(JSON_CONTENT_TYPE);
            } else if (RESPONSE_TYPE_XML.equalsIgnoreCase(responseType)){
                resp.setContentType(XML_CONTENT_TYPE);
            }
            if (responseCode != null) {
                resp.setStatus(responseCode);
            }
            resp.getWriter().print(response);
        } catch (final IOException ioex) {
            if (s_logger.isTraceEnabled()) {
                s_logger.trace("Exception writing http response: " + ioex);
            }
        } catch (final Exception ex) {
            if (!(ex instanceof IllegalStateException)) {
                s_logger.error("Unknown exception writing http response", ex);
            }
        }
    }
}

refactor HTTP transport stuff to HttpUtils