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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  import org.apache.http.annotation.Immutable;
31  
32  /**
33   * Standard authentication schemes supported by HttpClient.
34   *
35   * @since 4.3
36   */
37  @Immutable
38  public final class AuthSchemes {
39  
40      /**
41       * Basic authentication scheme as defined in RFC 2617 (considered inherently
42       * insecure, but most widely supported).
43       */
44      public static final String BASIC = "Basic";
45  
46      /**
47       * Digest authentication scheme as defined in RFC 2617.
48       */
49      public static final String DIGEST = "Digest";
50  
51      /**
52       * The NTLM authentication scheme is a proprietary Microsoft Windows
53       * authentication protocol as defined in [MS-NLMP].
54       */
55      public static final String NTLM = "NTLM";
56  
57      /**
58       * SPNEGO authentication scheme as defined in RFC 4559 and RFC 4178
59       * (considered to be the most secure among currently supported
60       * authentication schemes if Kerberos is selected).
61       */
62      public static final String SPNEGO = "Negotiate";
63  
64      /**
65       * Kerberos authentication scheme as defined in RFC 4120
66       * (considered to be the most secure among currently supported
67       * authentication schemes).
68       */
69      public static final String KERBEROS = "Kerberos";
70  
71      private AuthSchemes() {
72      }
73  
74  }