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I refer to this link to request to the server. The problem is sometime (not always, about 20% - 30%, means sometime I can get successful response), I got the 401 error and server response basic authorization challenge expected, but not found . Here is my code: HttpRequestInterceptor preemptiveAuth = new HttpRequestInterceptor() { public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException { AuthState authState = (AuthState) context .getAttribute(ClientContext.TARGET_AUTH_STATE); CredentialsProvider credsProvider = (CredentialsProvider) context .getAttribute(ClientContext.CREDS_PROVIDER); HttpHost targetHost = (HttpHost) context .getAttribute(ExecutionContext.HTTP_TARGET_HOST); if (authState.getAuthScheme() == null) { AuthScope authScope = new AuthScope(targetHost.getHostName(), targetHost.getPort()); Credentials creds = credsProvider.getCredentials(authScope); if (creds != null) { authState.setAuthScheme(new BasicScheme()); authState.setCredentials(creds); } } } }; Here is my authentication: HttpPost httpPost = new HttpPost(SERVER_AUTH_URL); httpPost.setHeader("Content-type", "text/xml; charset=utf-8"); httpPost.setHeader("Keep-Alive", "300"); httpPost.setHeader("Connection", "Keep-Alive"); StringEntity se = new StringEntity(myRequest, "UTF-8"); httpPost.setEntity(se); se.setContentType("text/xml"); se.setContentEncoding("gzip,deflate"); //add preemptiveAuth client.addRequestInterceptor(preemptiveAuth, 0); //Set the proxy ProxySelectorRoutePla

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