SPARQLProtocolSession custom HTTP Header

[mariussl]

I am using SPARQLRepository to connect via HTTP to Stardog. Stardog is configured to authenticate incoming connections via OAuth2.

So I need to set the required Authorization Header for every Request made to Stardog. I know of SPARQLRepository.setAdditionalHttpHeaders but this methods intention is to set custom http headers for all requests issued.

What I need is to set a custom http header for every SPARQLProtocolSession that is used by a SPARQLTupleQuery. Currently this is only possible by creating a new HttpClient for every SPARQLConnection and setting it through SPARQLConnection.setHttpClient. Codewise this looks like:

HttpClientBuilder builder = new HttpClientBuilder()
initialize builder
BasicHeader header = BasicHeader(HttpHeaders.Authorization, "bearer JWTTOKEN")
builder.setDefaultHeaders(listOf(header))
sparqlConnection.httpClient = builder.build()

Then the SPARQLTupleQuery spawned by SPARQLConnection.prepareTupleQuery will receive my custom HttpClient and pass it on to SPARQLTupleQuery.evaluate as SPARQLProtocolSession.

The downside of this is that I need to create a new HttpClientBuilder and HttpClient for every SPARQLConnection, so for every request issued to Stardog. I would prefer it if I could set the custom http header directly on the SPARQLProtocolSession used by SPARQLTupleQuery .

I have not yet found a public API to do this. Does anybody know of a way how to do this or has some other advice?

[ate47]

You can use an interceptor to add your auth header in your HttpClient, I think this code can help you:

HttpClientBuilder bld = HttpClientBuilder.create();
bld.addInterceptorFirst(
    (HttpRequestInterceptor) (httpRequest, httpContext) ->
        httpRequest.addHeader(HttpHeaders.AUTHORIZATION, "bearer JWTTOKEN")
);
CloseableHttpClient httpClient = bld.build();

You can then replace your auth header without having to recreate the HttpClient