Basic Authentication with RestTemplate (3.1)

Question

I am trying to reproduce the following curl command using Java:

curl -v -u user:pass http://myapp.com/api

This command returns some JSON data.

My buggy Java implementation is as follows:

@Test
public void callTest() {
    RestTemplate restTemplate = createRestTemplate("user", "pass");
    URI uri = new URI("http://myapp.com/api");
    String res = restTemplate.getForObject(uri, String.class);
}

private static RestTemplate createRestTemplate(String username, String password) {

    UsernamePasswordCredentials cred = new UsernamePasswordCredentials(username, password);
    BasicCredentialsProvider cp = new BasicCredentialsProvider();
    cp.setCredentials(AuthScope.ANY, cred);
    DefaultHttpClient client = new DefaultHttpClient();
    client.setCredentialsProvider(cp);
    ClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(client);

    RestTemplate restTemplate = new RestTemplate(factory);
    // set the media types properly
    return restTemplate;
}

Yet, when I execute the test, it returns a org.springframework.web.client.HttpClientErrorException: 401 Unauthorized exception.

When logging in DEBUG, I see no information about the authentication...

What am I doing wrong while setting the authentication credentials?

Answer 1

Instantiating using

HttpClient client = new HttpClient();

doesn't exist anymore and class DefaultHttpClient is deprecated from HttpComponents HttpClient from version 4.3. So other answer are either invalid or deprecated. Here is my version, I wrote this class for rest requests which require basic authentication:

import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.HttpClients;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

public class RestClient extends RestTemplate {
    public RestClient(String username, String password) {
        CredentialsProvider credsProvider = new BasicCredentialsProvider();
        credsProvider.setCredentials(
                new AuthScope(null, -1),
                new UsernamePasswordCredentials(username, password));
        HttpClient httpClient = HttpClients.custom().setDefaultCredentialsProvider(credsProvider).build();
        setRequestFactory(new HttpComponentsClientHttpRequestFactory(httpClient));
    }
}

Then use it like, for example:

RestClient restClient = new RestClient("username", "password");

String result = restClient.postForObject(...

Answer 2

I do something like this - and it has worked for me:

private RestTemplate createRestTemplate(String username, String password) {
    return new RestTemplate(this.createSecureTransport(username, password));
}

protected ClientHttpRequestFactory createSecureTransport(String username, String password){
    HttpClient client = new HttpClient();
    UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username,password);
    client.getState().setCredentials(AuthScope.ANY, credentials);
    CommonsClientHttpRequestFactory commons = new CommonsClientHttpRequestFactory(client);

    return commons;
}

It is used here: Reference Code

Answer 3

This answer is based on the one by @kevinpeterson, but with a rewrite to use the updated Apache HTTP Client.

RestTemplate createRestTemplate(String username, String password, String host, int port ) {
    return new RestTemplate(this.createSecureTransport( username, password, host, port ));
}

ClientHttpRequestFactory createSecureTransport( String username, String password, String host, int port ){
    DefaultHttpClient client = new DefaultHttpClient();
    UsernamePasswordCredentials credentials = new UsernamePasswordCredentials( username, password );
    client.getCredentialsProvider().setCredentials( new AuthScope( host, port ), credentials );
    return new HttpComponentsClientHttpRequestFactory(client);

Answer 4

httpclient v4.0 not Support Preemptive authentication

Look this : http://forum.springsource.org/showthread.php?123385-Preemptive-Basic-Authentication-with-RestTemplate

In spring Source found this solution.

It works for me.

Look this : RestTemplate with Basic Auth in Spring 3.1