Fuseki: setting a User-agent header for outgoing SPARQL request?

[Abbe98]

Is there a way to configure Fuseki so that it sets a user-agent header on outgoing requests?

Wikidata.org's SPARQL endpoint recently started enforcing its user-agent policy as a result one is heavily rate limited when doing federation with Wikidata without an User-agent header.

[afs]

Hi @Abbe98 - This is so that a query with SERVICE sent to a Fuseki server will call wikidata with the right user agent? And how to do that without writing java code?

It used to be possible (old java networking) with system properties but for the newer java.net.http it looks like the JDK does not allow external setting (which makes sense from a security perspective).

The JDK default is Java-http-client/21.0.6 so it looks like that is one of the ones wikidata don't like.

It is a code change to make that accessible to setting from the fuseki script.

[Abbe98]

This is so that a query with SERVICE sent to a Fuseki server will call wikidata with the right user agent? And how to do that without writing java code?

Indeed, it's exactly that.

[afs]

Thanks for the confirmation.
I'll raise an issue for adding ways to set the user agent, or maybe set it regardless to something other than the JDK default.

[afs]

Issue #3148.

[namedgraph]

Sounds like a case for a client request filter...

[afs]

@namedgraph Look at the Jena code.