content: package org.json;
  
  /*
  Copyright (c) 2002 JSON.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  The Software shall be used for Good, not Evil.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  */
  
  import java.util.Locale;
  
  /**
   * Convert an HTTP header to a JSONObject and back.
   * @author JSON.org
   * @version 2015-12-09
   */
  public class HTTP {
  
      /** Carriage return/line feed. */
      public static final String CRLF = "\r\n";
  
      /**
       * Convert an HTTP header string into a JSONObject. It can be a request
       * header or a response header. A request header will contain
       * <pre>{
       *    Method: "POST" (for example),
       *    "Request-URI": "/" (for example),
       *    "HTTP-Version": "HTTP/1.1" (for example)
       * }</pre>
       * A response header will contain
       * <pre>{
       *    "HTTP-Version": "HTTP/1.1" (for example),
       *    "Status-Code": "200" (for example),
       *    "Reason-Phrase": "OK" (for example)
       * }</pre>
       * In addition, the other parameters in the header will be captured, using
       * the HTTP field names as JSON names, so that <pre>
       *    Date: Sun, 26 May 2002 18:06:04 GMT
       *    Cookie: Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s
       *    Cache-Control: no-cache</pre>
       * become
       * <pre>{...
       *    Date: "Sun, 26 May 2002 18:06:04 GMT",
       *    Cookie: "Q=q2=PPEAsg--; B=677gi6ouf29bn&b=2&f=s",
       *    "Cache-Control": "no-cache",
       * ...}</pre>
       * It does no further checking or conversion. It does not parse dates.
       * It does not do '%' transforms on URLs.
       * @param string An HTTP header string.
       * @return A JSONObject containing the elements and attributes
       * of the XML string.
       * @throws JSONException
       */
      public static JSONObject toJSONObject(String string) throws JSONException {
          JSONObject     jo = new JSONObject();
          HTTPTokener    x = new HTTPTokener(string);
          String         token;
  
          token = x.nextToken();
          if (token.toUpperCase(Locale.ROOT).startsWith("HTTP")) {
  
  // Response
  
              jo.put("HTTP-Version", token);
              jo.put("Status-Code", x.nextToken());
              jo.put("Reason-Phrase", x.nextTo('\0'));
              x.next();
  
          } else {
  
  // Request
  
              jo.put("Method", token);
              jo.put("Request-URI", x.nextToken());
              jo.put("HTTP-Version", x.nextToken());
          }
  
  // Fields
  
          while (x.more()) {
              String name = x.nextTo(':');
              x.next(':');
              jo.put(name, x.nextTo('\0'));
              x.next();
          }
          return jo;
      }
  
  
      /**
       * Convert a JSONObject into an HTTP header. A request header must contain
       * <pre>{
       *    Method: "POST" (for example),
       *    "Request-URI": "/" (for example),
       *    "HTTP-Version": "HTTP/1.1" (for example)
       * }</pre>
       * A response header must contain
       * <pre>{
       *    "HTTP-Version": "HTTP/1.1" (for example),
       *    "Status-Code": "200" (for example),
       *    "Reason-Phrase": "OK" (for example)
       * }</pre>
       * Any other members of the JSONObject will be output as HTTP fields.
       * The result will end with two CRLF pairs.
       * @param jo A JSONObject
       * @return An HTTP header string.
       * @throws JSONException if the object does not contain enough
       *  information.
       */
      public static String toString(JSONObject jo) throws JSONException {
          StringBuilder       sb = new StringBuilder();
          if (jo.has("Status-Code") && jo.has("Reason-Phrase")) {
              sb.append(jo.getString("HTTP-Version"));
              sb.append(' ');
              sb.append(jo.getString("Status-Code"));
              sb.append(' ');
              sb.append(jo.getString("Reason-Phrase"));
          } else if (jo.has("Method") && jo.has("Request-URI")) {
              sb.append(jo.getString("Method"));
              sb.append(' ');
              sb.append('"');
              sb.append(jo.getString("Request-URI"));
              sb.append('"');
              sb.append(' ');
              sb.append(jo.getString("HTTP-Version"));
          } else {
              throw new JSONException("Not enough material for an HTTP header.");
          }
          sb.append(CRLF);
          // Don't use the new entrySet API to maintain Android support
          for (final String key : jo.keySet()) {
              String value = jo.optString(key);
              if (!"HTTP-Version".equals(key)      && !"Status-Code".equals(key) &&
                      !"Reason-Phrase".equals(key) && !"Method".equals(key) &&
                      !"Request-URI".equals(key)   && !JSONObject.NULL.equals(value)) {
                  sb.append(key);
                  sb.append(": ");
                  sb.append(jo.optString(key));
                  sb.append(CRLF);
              }
          }
          sb.append(CRLF);
          return sb.toString();
      }
  }
  