I have a similar issue.
I must call n-times a service with a single system user, authenticated with NTLM. I want to do this using multiple threads.
What I came up with is creating a single HTTPClient with no default credential provider. When a request needs to be performed I use an injected CredentialProviderFactory into the method performing the request (in a specific thread). Using this I get a brand new CredentialsProvider and I put this into a Context (created in the thread).
Then I call the execute method on the client using the overload execute(method, context)
.
class MilestoneBarClient implements IMilestoneBarClient {
private static final Logger log = LoggerFactory.getLogger(MilestoneBarClient.class);
private MilestoneBarBuilder builder;
private CloseableHttpClient httpclient;
private MilestoneBarUriBuilder uriBuilder;
private ICredentialsProviderFactory credsProviderFactory;
MilestoneBarClient(CloseableHttpClient client, ICredentialsProviderFactory credsProviderFactory, MilestoneBarUriBuilder uriBuilder) {
this(client, credsProviderFactory, uriBuilder, new MilestoneBarBuilder());
}
MilestoneBarClient(CloseableHttpClient client, ICredentialsProviderFactory credsProviderFactory, MilestoneBarUriBuilder uriBuilder, MilestoneBarBuilder milestoneBarBuilder) {
this.credsProviderFactory = credsProviderFactory;
this.uriBuilder = uriBuilder;
this.builder = milestoneBarBuilder;
this.httpclient = client;
}
// This method is called by multiple threads
@Override
public MilestoneBar get(String npdNumber) {
log.debug("Asking milestone bar info for {}", npdNumber);
try {
String url = uriBuilder.getPathFor(npdNumber);
log.debug("Building request for URL {}", url);
HttpClientContext localContext = HttpClientContext.create();
localContext.setCredentialsProvider(credsProviderFactory.create());
HttpGet httpGet = new HttpGet(url);
long start = System.currentTimeMillis();
try(CloseableHttpResponse resp = httpclient.execute(httpGet, localContext)){
[...]
For some reasons I sometimes get an error, but I guess it's an NTLMCredentials issue (not being thread-safe...).
In your case, you could probably pass the factory to the get methods instead of passing in creation.