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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.client.config;
29  
30  /**
31   * Standard authentication schemes supported by HttpClient.
32   *
33   * @since 4.3
34   */
35  public final class AuthSchemes {
36  
37      /**
38       * Basic authentication scheme as defined in RFC 2617 (considered inherently
39       * insecure, but most widely supported).
40       */
41      public static final String BASIC = "Basic";
42  
43      /**
44       * Digest authentication scheme as defined in RFC 2617.
45       */
46      public static final String DIGEST = "Digest";
47  
48      /**
49       * The NTLM authentication scheme is a proprietary Microsoft Windows
50       * authentication protocol as defined in [MS-NLMP].
51       */
52      public static final String NTLM = "NTLM";
53  
54      /**
55       * SPNEGO authentication scheme as defined in RFC 4559 and RFC 4178
56       * (considered to be the most secure among currently supported
57       * authentication schemes if Kerberos is selected).
58       */
59      public static final String SPNEGO = "Negotiate";
60  
61      /**
62       * Kerberos authentication scheme as defined in RFC 4120
63       * (considered to be the most secure among currently supported
64       * authentication schemes).
65       */
66      public static final String KERBEROS = "Kerberos";
67  
68      private AuthSchemes() {
69      }
70  
71  }