Using authenticated proxy with apache http client 4.3.6

Question

Can someone point me to authoritative example that demonstrates use of Proxy with authentication.

My searches reveal varied examples not necessarily using ver. 4.3.6 and hence the confusion.

I encountered two approaches as following. I prefer NOT to set the proxy and credentials for every request and hence wondering whats the best practice here? Also I have to make sure this works for Basic, Digest and NTLM schemes.

Approach 1:

// Create client and set credential provider
CloseableHttpClient httpclient = HttpClients.custom()
            .setDefaultCredentialsProvider(credsProvider).build();
// Every request is set the with proxy settings
RequestConfig config = RequestConfig.custom()
            .setProxy(proxy)
            .build();
HttpGet httpget = new HttpGet("/");
httpget.setConfig(config);

Approach 2:

HttpHost proxyHost = new HttpHost(proxyServer, proxyPort);
DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxyHost);

HttpClientBuilder clientBuilder = HttpClients.custom()
            .setConnectionManager(connectionManager);
clientBuilder.setRoutePlanner(routePlanner);

client = clientBuilder.build();

// Where and how to set credentials as best practice ?

I am sure to get some heckling for this one but so far I have wondered too much hence asking some help. thanks,

Prasad · Accepted Answer · 2015-02-25 23:08:05Z

Ok Here is what I ended up doing and solves the use case.

// Method that returns HTTP Client that can be re-used for various GET/POST/... calls
static CloseableHttpClient makeHttpClient(...) throws IOException {

    PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
    // Default MAX connections per route
    connectionManager.setDefaultMaxPerRoute(...);
    // MAX total connections
    connectionManager.setMaxTotal(...);

    HttpClientBuilder clientBuilder = HttpClients.custom()
            .setConnectionManager(connectionManager);
    // Set proxy if needed
    HttpHost proxyHost = new HttpHost(theProxyServer, port);
   DefaultProxyRoutePlanner routePlanner = new  DefaultProxyRoutePlanner(proxyHost);
   clientBuilder.setRoutePlanner(routePlanner);

   // Select and configure the properties you are interested in
   RequestConfig config = RequestConfig.custom()
                    .setProxy(proxyHost)
                    .setRedirectsEnabled(true)
                    .setMaxRedirects(5)
                    .setConnectTimeout(100 * 1000)
                    .setConnectionRequestTimeout(300 * 1000)
                    .setSocketTimeout(300 * 1000)
                    .build();

   // set proxy authentication as needed
   CredentialsProvider credentialProvider = new BasicCredentialsProvider();
   // set NTLM/basic/digest credentials
   credentialProvider.setCredentials(...)
   ....

   clientBuilder.setDefaultCredentialsProvider(credentialProvider);
   clientBuilder.setDefaultRequestConfig(config);

   // Now build and return the client
   return clientBuilder.build();
}

Now in other places use this client to perform HTTP operations.

// get HTTP client
makeHttpClient(...)
// get payload 
HttpPost postMethod = new HttpPost(url);
postMethod.setHeader(CONTENT_TYPE, CONTENT_TYPE_JSON);
postMethod.setEntity(payload);

try {
        response = client.execute(postMethod);
        ...
} catch(...) { ... }

This helps to create a HTTP client with all desired characteristics that can be re-used for various HTTP operations in different places.

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