如何使用带Web身份验证的Apache httpclient执行http post？

Question

我已经为此搜索了很多，无法找到一个体面的解决方案。使用凭证提供程序的方法很糟糕，因为它使与请求相反的调用数量加倍，即它触发请求，获取401并仅使用Web认证凭证触发请求。

任何使用android的httpclient库来完成http post请求到web身份验证成功后的URL？

Answer 1

对于HttpClient的4.0.x的您使用HttpRequestInterceptor启用抢先认证 - 因为AndroidHttpClient类不公开addRequestInterceptor(..)方法，你可能将不得不使用DefaultHttpClient类。

本示例将垃圾邮件user1/user1传送给任何感兴趣的服务器。如果您关心安全性，请调整AuthScope。

 
DefaultHttpClient client = new DefaultHttpClient(); 
client.getCredentialsProvider().setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("user1", "user1")); 
client.addRequestInterceptor(new HttpRequestInterceptor() { 
    public void process(HttpRequest request, HttpContext context) throws HttpException, IOException { 
     AuthState state = (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE); 
     if (state.getAuthScheme() == null) { 
      BasicScheme scheme = new BasicScheme(); 
      CredentialsProvider credentialsProvider = (CredentialsProvider) context.getAttribute(ClientContext.CREDS_PROVIDER); 
      Credentials credentials = credentialsProvider.getCredentials(AuthScope.ANY); 
      if (credentials == null) { 
       throw new HttpException(); 
      } 
      state.setAuthScope(AuthScope.ANY); 
      state.setAuthScheme(scheme); 
      state.setCredentials(credentials); 
     } 
    } 
}, 0); // 0 = first, and you really want to be first.