我需要使用 web 服务进行身份验证，所以我从这里尝试了示例。我传递了所有必需的参数和凭据，但在打印响应时收到了失败。我已经在浏览器中测试了用户名和密码，一切正常，但我不明白这里发生了什么：
我的 web 服务是用 ASP.NET 开发的
logcate :: (响应)
04-19 02:10:14.063: WARN/etAuthenticationHandler(1613): Authentication scheme ntlm not supported
04-19 02:10:14.070: WARN/DefaultRequestDirector(1613): Authentication error: Unable to respond to any of these challenges: {ntlm=WWW-Authenticate: NTLM, negotiate=WWW-Authenticate: Negotiate}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): OK: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <html xmlns="http://www.w3.org/1999/xhtml">
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <head>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <title>401 - Unauthorized: Access is denied due to invalid credentials.</title>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <style type="text/css">
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <!--
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): fieldset{padding:0 15px 10px 15px;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): h1{font-size:2.4em;margin:0;color:#FFF;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): h2{font-size:1.7em;margin:0;color:#CC0000;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): #header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): background-color:#555555;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): #content{margin:0 0 0 2%;position:relative;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): .content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): -->
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </style>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </head>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <body>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <div id="header"><h1>Server Error</h1></div>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <div id="content">
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <div class="content-container"><fieldset>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <h2>401 - Unauthorized: Access is denied due to invalid credentials.</h2>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): <h3>You do not have permission to view this directory or page using the credentials that you supplied.</h3>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </fieldset></div>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </div>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </body>
04-19 02:10:14.080: DEBUG/MY_APP_TAG(1613): </html>
代码：
String username = "uname";
String host = "host";
String password = "pass";
String urlApiCall_FindAllRepositories =
"http://host:2003/VoyagerWebservice7.0.1/webservices.asmx/Naptan_GetStops_ForVoyager_FromSearch_Custom?SerachText=Easton";
try {
HttpClient client = new DefaultHttpClient();
AuthScope as = new AuthScope(host, 2003);
UsernamePasswordCredentials upc = new UsernamePasswordCredentials(
username, password);
((AbstractHttpClient) client).getCredentialsProvider()
.setCredentials(as, upc);
BasicHttpContext localContext = new BasicHttpContext();
BasicScheme basicAuth = new BasicScheme();
localContext.setAttribute("preemptive-auth", basicAuth);
HttpHost targetHost = new HttpHost(host, 2003, "http");
HttpGet httpget = new HttpGet(urlApiCall_FindAllRepositories);
httpget.setHeader("Content-Type", "text/xml");
HttpResponse response = client.execute(targetHost, httpget,
localContext);
HttpEntity entity = response.getEntity();
Object content = EntityUtils.toString(entity);
Log.d("MY_APP_TAG", "OK: " + content.toString());
} catch (Exception e) {
e.printStackTrace();
Log.d("MY_APP_TAG", "Error: " + e.getMessage());
}