Question

自从HttpClient 4.3以来，我一直在使用HttpClientBuilder。我正在连接到具有基本身份验证的REST服务。我正在设置凭据如下：

HttpClientBuilder builder = HttpClientBuilder.create();

// Get the client credentials
String username = Config.get(Constants.CONFIG_USERNAME);
String password = Config.get(Constants.CONFIG_PASSWORD);

// If username and password was found, inject the credentials
if (username != null && password != null)
{
    CredentialsProvider provider = new BasicCredentialsProvider();

    // Create the authentication scope
    AuthScope scope = new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, AuthScope.ANY_REALM);

    // Create credential pair
    UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username, password);

    // Inject the credentials
    provider.setCredentials(scope, credentials);

    // Set the default credentials provider
    builder.setDefaultCredentialsProvider(provider);
}

但是，这不起作用（我正在使用的REST服务返回401）。出了什么问题？

Answer 1

来自抢先身份验证文档：

http://hc.apache.org/httpcomponents-client-ga/tutorial/html/authentication.html

默认情况下，httpclient不会提前提供凭据，它将首先创建没有身份验证参数的HTTP请求。这是设计，作为安全预防措施，并作为规范的一部分。但是，如果您不重试连接，或者您要连接的任何地方都希望您在第一个连接上发送身份验证详细信息，则会导致问题。它还会导致请求的额外延迟，因为您需要进行多次调用，并导致401s出现在日志中。

解决方法是使用身份验证缓存假装您已连接到服务器一次。这意味着您只能进行一次HTTP调用，并且不会在日志中看到401：

CloseableHttpClient httpclient = HttpClientBuilder.create().build();

HttpHost targetHost = new HttpHost("localhost", 80, "http");
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
        new AuthScope(targetHost.getHostName(), targetHost.getPort()),
        new UsernamePasswordCredentials("username", "password"));

// Create AuthCache instance
AuthCache authCache = new BasicAuthCache();
// Generate BASIC scheme object and add it to the local auth cache
BasicScheme basicAuth = new BasicScheme();
authCache.put(targetHost, basicAuth);

// Add AuthCache to the execution context
HttpClientContext context = HttpClientContext.create();
context.setCredentialsProvider(credsProvider);
context.setAuthCache(authCache);

HttpGet httpget = new HttpGet("/");
for (int i = 0; i < 3; i++) {
    CloseableHttpResponse response = httpclient.execute(
            targetHost, httpget, context);
    try {
        HttpEntity entity = response.getEntity();

    } finally {
        response.close();
    }
}

请注意：您需要信任您要连接的主机，如果您使用的是HTTP，您的用户名和密码将以明文形式发送（嗯，base64，但不计算在内）。

您还应该使用更具体的Authscope，而不是像示例中那样依赖AuthScope .ANY_HOST和AuthScope.ANY_PORT。

Answer 2

实际上，既然您已经信任服务器，那么自己构建授权标头可能最容易。

 byte[] credentials = Base64.encodeBase64((username + ":" + password).getBytes(StandardCharsets.UTF_8));
 request.setHeader("Authorization", "Basic " + new String(credentials, StandardCharsets.UTF_8));
 httpClient.execute(request);

这只是其中一种情况，因为它更容易阅读spec，并自行滚动。

Answer 3

我刚刚尝试了您的代码示例（针对一个简单的基于身份验证的网址）并且它运行正常 - 这是来自HttpClient的日志 - 为简洁起见有点简化：

web - 2014-01-04 12:43:19,700 [main] DEBUG o.a.h.c.protocol.RequestAddCookies - CookieSpec selected: best-match
web - 2014-01-04 12:43:19,710 [main] DEBUG o.a.h.c.protocol.RequestAuthCache - Auth cache not set in the context
web - 2014-01-04 12:43:19,728 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Opening connection {}->http://localhost:8080
web - 2014-01-04 12:43:19,730 [main] DEBUG o.a.h.c.HttpClientConnectionManager - Connecting to localhost/127.0.0.1:8080
web - 2014-01-04 12:43:19,731 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Executing request GET /spring-security-mvc-basic-auth/homepage.html HTTP/1.1
web - 2014-01-04 12:43:19,731 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Target auth state: UNCHALLENGED
web - 2014-01-04 12:43:19,731 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Proxy auth state: UNCHALLENGED
web - 2014-01-04 12:43:19,732 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> GET /spring-security-mvc-basic-auth/homepage.html HTTP/1.1
web - 2014-01-04 12:43:19,732 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Host: localhost:8080
web - 2014-01-04 12:43:19,732 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.3.1 (java 1.5)
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << HTTP/1.1 401 Unauthorized
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Server: Apache-Coyote/1.1
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Set-Cookie: JSESSIONID=B8E6D0D7DE0C99991A74E9B2E4EA68AE; Path=/spring-security-mvc-basic-auth/; HttpOnly
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << WWW-Authenticate: Basic realm="Baeldung"
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Length: 75
web - 2014-01-04 12:43:19,735 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Date: Sat, 04 Jan 2014 10:43:19 GMT
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.http.impl.auth.HttpAuthenticator - Authentication required
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.http.impl.auth.HttpAuthenticator - localhost:8080 requested authentication
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Authentication schemes in the order of preference: [negotiate, Kerberos, NTLM, Digest, Basic]
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Challenge for negotiate authentication scheme not available
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Challenge for Kerberos authentication scheme not available
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Challenge for NTLM authentication scheme not available
web - 2014-01-04 12:43:19,738 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Challenge for Digest authentication scheme not available
web - 2014-01-04 12:43:19,745 [main] DEBUG o.a.http.impl.auth.HttpAuthenticator - Selected authentication options: [BASIC]
web - 2014-01-04 12:43:19,746 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Executing request GET /spring-security-mvc-basic-auth/homepage.html HTTP/1.1
web - 2014-01-04 12:43:19,746 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Target auth state: CHALLENGED
web - 2014-01-04 12:43:19,746 [main] DEBUG o.a.http.impl.auth.HttpAuthenticator - Generating response to an authentication challenge using basic scheme
web - 2014-01-04 12:43:19,747 [main] DEBUG o.a.h.impl.execchain.MainClientExec - Proxy auth state: UNCHALLENGED
web - 2014-01-04 12:43:19,747 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> GET /spring-security-mvc-basic-auth/homepage.html HTTP/1.1
web - 2014-01-04 12:43:19,747 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Host: localhost:8080
web - 2014-01-04 12:43:19,747 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.3.1 (java 1.5)
web - 2014-01-04 12:43:19,747 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Authorization: Basic dXNlcjE6dXNlcjFQYXNz
web - 2014-01-04 12:43:19,750 [main] DEBUG org.apache.http.headers - http-outgoing-0 << HTTP/1.1 200 OK
web - 2014-01-04 12:43:19,750 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Server: Apache-Coyote/1.1
web - 2014-01-04 12:43:19,750 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Set-Cookie: JSESSIONID=C03FD4EB1421A4C3A003ADC895D49599; Path=/spring-security-mvc-basic-auth/; HttpOnly
web - 2014-01-04 12:43:19,750 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Type: text/html;charset=ISO-8859-1
web - 2014-01-04 12:43:19,750 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Language: en-US
web - 2014-01-04 12:43:19,751 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Length: 96
web - 2014-01-04 12:43:19,751 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Date: Sat, 04 Jan 2014 10:43:19 GMT
web - 2014-01-04 12:43:19,751 [main] DEBUG o.a.http.impl.auth.HttpAuthenticator - Authentication succeeded
web - 2014-01-04 12:43:19,751 [main] DEBUG o.a.h.i.c.TargetAuthenticationStrategy - Caching 'basic' auth scheme for http://localhost:8080
web - 2014-01-04 12:43:19,760 [main] DEBUG o.a.h.c.p.ResponseProcessCookies - Cookie accepted: "[version: 0][name: JSESSIONID][value: C03FD4EB1421A4C3A003ADC895D49599][domain: localhost][path: /spring-security-mvc-basic-auth/][expiry: null]".

所以 - 简单地说：
- 服务器确实质疑初始请求
- HttpClient识别基本身份验证方案并正确响应挑战 - 此时服务器服务器预期200 OK

您可能正在使用的REST服务实际上并未使用基本身份验证。您可以尝试粘贴完整的HttpClient日志，以便更好地诊断问题。

希望有所帮助。

Answer 4

我认为 HttpClient就像其他基于curl的解决方案一样，它遵循规范。

规范是＆＃34;除非服务器告诉您这样做，否则不要发送凭据＆＃34;。所以你得到401（＆＃34;我希望你发送凭证＆＃34;）......

这是一个常见的肥皂问题：当你不知道时，它并不明显

HttpClientBuilder基本身份验证

4 个答案: