Proxy Jena代理身份验证

在尝试查询SPARQL服务时，我得到一个HTTPException 407。我必须使用需要用户名和密码的代理

我的身份验证代码如下所示：

HttpAuthenticator authenticator = new PreemptiveBasicAuthenticator(new SimpleAuthenticator(USERNAME, PASSWORD),true);

QueryExecution qexec = QueryExecutionFactory.sparqlService(serverUrl, query,
                                                           authenticator);
qexec.execSelect();

然后我尝试如下查询：

HttpAuthenticator authenticator = new PreemptiveBasicAuthenticator(new SimpleAuthenticator(USERNAME, PASSWORD),true);

QueryExecution qexec = QueryExecutionFactory.sparqlService(serverUrl, query,
                                                           authenticator);
qexec.execSelect();

在jvm参数中，我传递

-Dhttp.proxyHost

和

-Dhttp.proxyPort

---

令人困惑的是，如果我尝试连接到谷歌，它会与我的代理设置一起工作。即使没有用户名/密码

String strUrl = "http://www.google.com"; 
URL url = new URL(strUrl);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.connect();

String strUrl = "http://www.google.com"; 
URL url = new URL(strUrl);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.connect();

如果尝试连接到sparql端点，则会出现HTTP 407错误。我可以在浏览器中访问端点，我的同事也可以访问端点

在文档中，他们说，

PreemptiveBasicAuthenticator

构造函数中的布尔值用于代理使用。这就是为什么我试着用这个代码

编辑： 记录信息

DEBUG 27139 [2014-03-18 14:05:37,970] [main] org.apache.http.impl.conn.PoolingClientConnectionManager  - Connection request: [route: {}->http:*:81->http:*.com][total kept alive: 0; route allocated: 0 of 5; total allocated: 0 of 10]
DEBUG 27146 [2014-03-18 14:05:37,977] [main] org.apache.http.impl.conn.PoolingClientConnectionManager  - Connection leased: [id: 0][route: {}->http:*:81->http:*.com][total kept alive: 0; route allocated: 1 of 5; total allocated: 1 of 10]
DEBUG 27148 [2014-03-18 14:05:37,979] [main] org.apache.http.impl.conn.DefaultClientConnectionOperator  - Connecting to proxy.*:81
DEBUG 27162 [2014-03-18 14:05:37,993] [main] org.apache.http.client.protocol.RequestAddCookies  - CookieSpec selected: best-match
DEBUG 27164 [2014-03-18 14:05:37,995] [main] org.apache.http.client.protocol.RequestAuthCache  - Auth cache not set in the context
DEBUG 27164 [2014-03-18 14:05:37,995] [main] org.apache.http.client.protocol.RequestTargetAuthentication  - Target auth state: UNCHALLENGED
DEBUG 27165 [2014-03-18 14:05:37,996] [main] org.apache.http.client.protocol.RequestProxyAuthentication  - Proxy auth state: UNCHALLENGED
DEBUG 27166 [2014-03-18 14:05:37,997] [main] org.apache.http.impl.client.SystemDefaultHttpClient  - Attempt 1 to execute request
DEBUG 27166 [2014-03-18 14:05:37,997] [main] org.apache.http.impl.conn.DefaultClientConnection  - Sending request: GET http:* HTTP/1.1
DEBUG 27168 [2014-03-18 14:05:37,999] [main] org.apache.http.wire  -  >> "GET http:* HTTP/1.1[\r][\n]"
DEBUG 27169 [2014-03-18 14:05:38,000] [main] org.apache.http.wire  -  >> "Accept: application/sparql-results+xml[\r][\n]"
DEBUG 27169 [2014-03-18 14:05:38,000] [main] org.apache.http.wire  -  >> "User-Agent: Apache-Jena-ARQ/2.11.1[\r][\n]"
DEBUG 27170 [2014-03-18 14:05:38,001] [main] org.apache.http.wire  -  >> "Accept-Encoding: gzip,deflate[\r][\n]"
DEBUG 27170 [2014-03-18 14:05:38,001] [main] org.apache.http.wire  -  >> "Host: *[\r][\n]"
DEBUG 27171 [2014-03-18 14:05:38,002] [main] org.apache.http.wire  -  >> "Proxy-Connection: Keep-Alive[\r][\n]"
DEBUG 27171 [2014-03-18 14:05:38,002] [main] org.apache.http.wire  -  >> "[\r][\n]"
DEBUG 27171 [2014-03-18 14:05:38,002] [main] org.apache.http.headers  - >> GET http:* HTTP/1.1
DEBUG 27172 [2014-03-18 14:05:38,003] [main] org.apache.http.headers  - >> Accept: application/sparql-results+xml
DEBUG 27173 [2014-03-18 14:05:38,004] [main] org.apache.http.headers  - >> User-Agent: Apache-Jena-ARQ/2.11.1
DEBUG 27173 [2014-03-18 14:05:38,004] [main] org.apache.http.headers  - >> Accept-Encoding: gzip,deflate
DEBUG 27173 [2014-03-18 14:05:38,004] [main] org.apache.http.headers  - >> Host: *
DEBUG 27173 [2014-03-18 14:05:38,004] [main] org.apache.http.headers  - >> Proxy-Connection: Keep-Alive
DEBUG 27178 [2014-03-18 14:05:38,009] [main] org.apache.http.wire  -  << "HTTP/1.1 407 Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )[\r][\n]"
DEBUG 27179 [2014-03-18 14:05:38,010] [main] org.apache.http.wire  -  << "Via: 1.1 *[\r][\n]"
DEBUG 27179 [2014-03-18 14:05:38,010] [main] org.apache.http.wire  -  << "Proxy-Authenticate: Negotiate[\r][\n]"
DEBUG 27179 [2014-03-18 14:05:38,010] [main] org.apache.http.wire  -  << "Proxy-Authenticate: Kerberos[\r][\n]"
DEBUG 27180 [2014-03-18 14:05:38,011] [main] org.apache.http.wire  -  << "Proxy-Authenticate: NTLM[\r][\n]"
DEBUG 27180 [2014-03-18 14:05:38,011] [main] org.apache.http.wire  -  << "Connection: Keep-Alive[\r][\n]"
DEBUG 27180 [2014-03-18 14:05:38,011] [main] org.apache.http.wire  -  << "Proxy-Connection: Keep-Alive[\r][\n]"
DEBUG 27181 [2014-03-18 14:05:38,012] [main] org.apache.http.wire  -  << "Pragma: no-cache[\r][\n]"
DEBUG 27181 [2014-03-18 14:05:38,012] [main] org.apache.http.wire  -  << "Cache-Control: no-cache[\r][\n]"
DEBUG 27181 [2014-03-18 14:05:38,012] [main] org.apache.http.wire  -  << "Content-Type: text/html[\r][\n]"
DEBUG 27182 [2014-03-18 14:05:38,013] [main] org.apache.http.wire  -  << "Content-Length: 894   [\r][\n]"
DEBUG 27182 [2014-03-18 14:05:38,013] [main] org.apache.http.wire  -  << "[\r][\n]"
DEBUG 27183 [2014-03-18 14:05:38,014] [main] org.apache.http.impl.conn.DefaultClientConnection  - Receiving response: HTTP/1.1 407 Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )
DEBUG 27183 [2014-03-18 14:05:38,014] [main] org.apache.http.headers  - << HTTP/1.1 407 Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied.  )
DEBUG 27183 [2014-03-18 14:05:38,014] [main] org.apache.http.headers  - << Via: 1.1 *
DEBUG 27184 [2014-03-18 14:05:38,015] [main] org.apache.http.headers  - << Proxy-Authenticate: Negotiate
DEBUG 27184 [2014-03-18 14:05:38,015] [main] org.apache.http.headers  - << Proxy-Authenticate: Kerberos
DEBUG 27184 [2014-03-18 14:05:38,015] [main] org.apache.http.headers  - << Proxy-Authenticate: NTLM
DEBUG 27185 [2014-03-18 14:05:38,016] [main] org.apache.http.headers  - << Connection: Keep-Alive
DEBUG 27185 [2014-03-18 14:05:38,016] [main] org.apache.http.headers  - << Proxy-Connection: Keep-Alive
DEBUG 27185 [2014-03-18 14:05:38,016] [main] org.apache.http.headers  - << Pragma: no-cache
DEBUG 27185 [2014-03-18 14:05:38,016] [main] org.apache.http.headers  - << Cache-Control: no-cache
DEBUG 27186 [2014-03-18 14:05:38,017] [main] org.apache.http.headers  - << Content-Type: text/html
DEBUG 27186 [2014-03-18 14:05:38,017] [main] org.apache.http.headers  - << Content-Length: 894   
DEBUG 27187 [2014-03-18 14:05:38,018] [main] org.apache.http.impl.client.SystemDefaultHttpClient  - Connection can be kept alive indefinitely
DEBUG 27187 [2014-03-18 14:05:38,018] [main] org.apache.http.impl.client.SystemDefaultHttpClient  - Authentication required
DEBUG 27187 [2014-03-18 14:05:38,018] [main] org.apache.http.impl.client.SystemDefaultHttpClient  - proxy*:81 requested authentication
DEBUG 27188 [2014-03-18 14:05:38,019] [main] org.apache.http.impl.client.ProxyAuthenticationStrategy  - Authentication schemes in the order of preference: [negotiate, Kerberos, NTLM, Digest, Basic]
DEBUG 27189 [2014-03-18 14:05:38,020] [main] org.apache.http.impl.auth.SPNegoScheme  - Received challenge '' from the auth server
DEBUG 27190 [2014-03-18 14:05:38,021] [main] org.apache.http.impl.auth.KerberosScheme  - Received challenge '' from the auth server
DEBUG 27190 [2014-03-18 14:05:38,021] [main] org.apache.http.impl.client.ProxyAuthenticationStrategy  - Challenge for Digest authentication scheme not available
DEBUG 27190 [2014-03-18 14:05:38,021] [main] org.apache.http.impl.client.ProxyAuthenticationStrategy  - Challenge for Basic authentication scheme not available
DEBUG 27198 [2014-03-18 14:05:38,029] [main] org.apache.http.wire  -  << "<HTML><HEAD>[\r][\n]"
DEBUG 27198 [2014-03-18 14:05:38,029] [main] org.apache.http.wire  -  << "<TITLE>Proxy Error Message</TITLE>[\r][\n]"
DEBUG 27198 [2014-03-18 14:05:38,029] [main] org.apache.http.wire  -  << "</HEAD>[\r][\n]"
DEBUG 27199 [2014-03-18 14:05:38,030] [main] org.apache.http.wire  -  << "<frameset cols="*">[\r][\n]"
DEBUG 27199 [2014-03-18 14:05:38,030] [main] org.apache.http.wire  -  << "[0x9]<frame src="http:* Proxy Authentication Required&err=Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied. &proxy=*&time=18.03.2014 13:05:38 [GMT]&isa=1&errorhtml=default.htm" name="ProxyError"> [\r][\n]"
DEBUG 27200 [2014-03-18 14:05:38,031] [main] org.apache.http.wire  -  << " <noframes>[\r][\n]"
DEBUG 27200 [2014-03-18 14:05:38,031] [main] org.apache.http.wire  -  << " If this site does not automatically reload, click <a href="*">here</a> [\r][\n]"
DEBUG 27201 [2014-03-18 14:05:38,032] [main] org.apache.http.wire  -  << " </noframes>[\r][\n]"
DEBUG 27201 [2014-03-18 14:05:38,032] [main] org.apache.http.wire  -  << "</frameset>[\r][\n]"
DEBUG 27202 [2014-03-18 14:05:38,033] [main] org.apache.http.wire  -  << "</HTML>[\r][\n]"
DEBUG 27202 [2014-03-18 14:05:38,033] [main] org.apache.http.impl.conn.PoolingClientConnectionManager  - Connection [id: 0][route: {}->http:*:81->http:* can be kept alive indefinitely
DEBUG 27203 [2014-03-18 14:05:38,034] [main] org.apache.http.impl.conn.PoolingClientConnectionManager  - Connection released: [id: 0][route: {}->http:*:81->http:*][total kept alive: 1; route allocated: 1 of 5; total allocated: 1 of 10]

DEBUG 27139[2014-03-18 14:05:37970][main]org.apache.http.impl.conn.poolgclientconnectionmanager-连接请求：[路由：{}->http:::::81->http:.com][总保持活动状态：0；分配的路由：0/5；分配的路由：0/10]
调试27146[2014-03-18 14:05:37977][main]org.apache.http.impl.conn.poolgclientconnectionmanager-租用的连接：[id:0][route:{}->http::::81->http:.com][总保持活动状态：0；分配的路由：5个中的1个；分配的总路由：10个中的1个]
调试27148[2014-03-18 14:05:37979][main]org.apache.http.impl.conn.DefaultClientConnectionOperator-连接到代理。*:81
调试27162[2014-03-18 14:05:37993][main]org.apache.http.client.protocol.RequestAddCookies-CookieSpec选中：最佳匹配
调试27164[2014-03-18 14:05:37995][main]org.apache.http.client.protocol.RequestAuthCache-未在上下文中设置Auth缓存
DEBUG 27164[2014-03-18 14:05:37995][main]org.apache.http.client.protocol.RequestTargetAuthentication-目标身份验证状态：未被质询
DEBUG 27165[2014-03-18 14:05:37996][main]org.apache.http.client.protocol.RequestProxyAuthentication-代理身份验证状态：未被质询
调试27166[2014-03-18 14:05:37997][main]org.apache.http.impl.client.SystemDefaultHttpClient-尝试1执行请求
调试27166[2014-03-18 14:05:37997][main]org.apache.http.impl.conn.DefaultClientConnection-发送请求：获取http:*http/1.1
调试27168[2014-03-18 14:05:37999][main]org.apache.http.wire->“获取http:*http/1.1[\r][\n]”
调试27169[2014-03-18 14:05:38000][main]org.apache.http.wire->“接受：应用程序/sparql结果+xml[\r][\n]”
调试27169[2014-03-18 14:05:38000][main]org.apache.http.wire->“用户代理：apache Jena ARQ/2.11.1[\r][\n]”
调试27170[2014-03-18 14:05:38001][main]org.apache.http.wire->“接受编码：gzip，解压缩[\r][\n]”
调试27170[2014-03-18 14:05:38001][main]org.apache.http.wire->“主机：[\r][\n]”
调试27171[2014-03-18 14:05:38002][main]org.apache.http.wire->>“代理连接：保持活动[\r][\n]”
调试27171[2014-03-18 14:05:38002][main]org.apache.http.wire->>“[\r][\n]”
调试27171[2014-03-18 14:05:38002][main]org.apache.http.headers->>获取http:*http/1.1
调试27172[2014-03-18 14:05:38003][main]org.apache.http.headers->>Accept:application/sparql results+xml
调试27173[2014-03-18 14:05:38004][main]org.apache.http.headers->>用户代理：apache Jena ARQ/2.11.1
调试27173[2014-03-18 14:05:38004][main]org.apache.http.headers->>接受编码：gzip，deflate
调试27173[2014-03-18 14:05:38004][main]org.apache.http.headers->>主机：*
调试27173[2014-03-18 14:05:38004][main]org.apache.http.headers->>代理连接：保持活动状态
DEBUG 27178[2014-03-18 14:05:38009][main]org.apache.http.wire-
HttpAuthenticator
适用于您正在查询的远程端点，而不是代理

您需要将
http.proxyUser
和
http.proxyPassword
设置为JVM参数或设置代理身份验证器

参见导致
的示例。令人困惑的是，如果我尝试连接到谷歌，它会与我的代理设置一起工作。即使没有用户名/密码

String strUrl = "http://www.google.com"; 
URL url = new URL(strUrl);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.connect();

String strUrl = "http://www.google.com"; 
URL url = new URL(strUrl);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.connect();

如果尝试连接到sparql端点，则会出现HTTP 407错误。我可以在浏览器中访问端点，我的同事也可以访问端点

在文档中，他们说PreemptiveBasicAuthenticator构造函数中的布尔值用于代理使用。这就是为什么我尝试使用这段代码。
当抢占式身份验证适用于代理时
使用
PreemptiveBasicAuthenticator
并将
forProxy
参数设置为true仅在某些情况下相关：


您的代理服务器需要身份验证（似乎就是这种情况）
代理服务器使用基本HTTP身份验证

从您获得HTTP 407的事实来看，这意味着您的代理服务器不支持基本的HTTP身份验证，并且可能要求您执行摘要或其他类型的HTTP身份验证

调试出了什么问题
请注意，ARQ使用后台，因此您可以打开日志来查看详细的HTTP跟踪。将
org.apache.http
包的日志级别设置为
DEBUG
，以查看有关请求和响应的一般信息，并将其一直设置为
TRACE
，以查看详细的http跟踪，这将允许您精确查看代理返回的响应

特别是要查看服务器响应中的
代理身份验证
标头包含的内容，如果此标头的内容不包含单词
Basic
，则不能使用
PreemptiveBasicAuthenticator

使用非基本身份验证
如果服务器不支持基本身份验证，则您可以直接使用，这将支持基本/摘要身份验证方案，因此可以解决身份验证问题，例如：

HttpAuthenticator authenticator = new SimpleAuthenticator(USERNAME, PASSWORD);

编辑

然而在你的c