Fw: How to use Olingo with a proxy?

[Paul Graystone <pa...@ymail.com>]

 Dear Olingo users,
I am trying to access http://services.odata.org/V4/TripPinService/ (the SERVICE_ROOT) via Olingo from behind a proxy. I am able to reach this service using different browser and also with Postman. However, with Apache Olingo the connection fails.In order to make Java use the proxy I set following JVM parameters:-Dhttp.proxySet=true -Dhttp.proxyHost=http-proxy.example.com -Dhttp.proxyPort=8080With this parameters set I am able to perform basic URL functions, like retrieving the HTTP status code of a web page (google returns correctly "200"). However, it seems as Olingo still won't use the proxy. Following code for example does not execute (it seems to be stuck doing the execute), nor is any error thrown:ODataClient client = ODataClientFactory.getClient();
ODataServiceDocumentRequest request = client.getRetrieveRequestFactory().getServiceDocumentRequest(SERVICE_ROOT);
ODataRetrieveResponse<ClientServiceDocument> response = request.execute();I tried using the proxy capabilities within Olingo, however without any success:client.getConfiguration().setHttpClientFactory(new ProxyWrappingHttpClientFactory(URI.create("http://http-proxy.example.com:8080")));What is the right way to use Olingo from behind a proxy?Thank you very much.Kind regards,Paul

   

RE: How to use Olingo with a proxy?

[Rob Sessink | Kramp <Ro...@kramp.com>]

Hello Paul,

using Apache Olingo through a proxy is certainly possible, In my development setup, I use it in combination with Fiddler for debugging purposes. Please see the below code for wrapping the ODataClient with a ProxyWrappingHttpClientFactory.

Regards Rob

----
    private ODataClient client;

    private void initialize() {
        client = ODataClientFactory.getClient();
        HttpClientFactory factory = getNTLMAuthHttpClientFactory();
        factory = wrapProxy(factory, proxyURI);
        client.getConfiguration().setHttpClientFactory(factory);
    }

/**
 * Wrap the factory to tunnel through a proxy
 *
 * @param factory  HttpClientFactory
 * @param proxyUri String proxy url
 * @return HttpClientFactory
 */
private HttpClientFactory wrapProxy(HttpClientFactory factory, String proxyUri) {
    try {
        if (proxyUri == null || proxyUri.isEmpty()) {
            return factory;
        }
        return new ProxyWrappingHttpClientFactory(new URI(proxyUri),
                (DefaultHttpClientFactory) factory);
    } catch (URISyntaxException e) {
        LOG.error("Proxy URL: {} is invalid, proxy is not used", proxyUri, e);
        return factory;
    }
}
----

From: Paul Graystone [mailto:paul.graystone@ymail.com]
Sent: Friday, January 13, 2017 11:15 AM
To: user@olingo.apache.org
Subject: Fw: How to use Olingo with a proxy?

 Dear Olingo users,

I am trying to access http://services.odata.org/V4/TripPinService/ (the SERVICE_ROOT) via Olingo from behind a proxy. I am able to reach this service using different browser and also with Postman. However, with Apache Olingo the connection fails.
In order to make Java use the proxy I set following JVM parameters:
-Dhttp.proxySet=true -Dhttp.proxyHost=http-proxy.example.com -Dhttp.proxyPort=8080
With this parameters set I am able to perform basic URL functions, like retrieving the HTTP status code of a web page (google returns correctly "200"). However, it seems as Olingo still won't use the proxy. Following code for example does not execute (it seems to be stuck doing the execute), nor is any error thrown:
ODataClient client = ODataClientFactory.getClient();
ODataServiceDocumentRequest request = client.getRetrieveRequestFactory().getServiceDocumentRequest(SERVICE_ROOT);
ODataRetrieveResponse<ClientServiceDocument> response = request.execute();
I tried using the proxy capabilities within Olingo, however without any success:
client.getConfiguration().setHttpClientFactory(new ProxyWrappingHttpClientFactory(URI.create("http://http-proxy.example.com:8080")));
What is the right way to use Olingo from behind a proxy?
Thank you very much.
Kind regards,
Paul


Met vriendelijke groeten - Best regards - Mit freundlichen Gr??en - Sinc?res salutations

Rob Sessink

Integration Engineer





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