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From "Niraj Patel (JIRA)" <>
Subject [jira] [Created] (JENA-1604) Add request hook for HTTP query execution
Date Fri, 14 Sep 2018 17:43:00 GMT
Niraj Patel created JENA-1604:

             Summary: Add request hook for HTTP query execution
                 Key: JENA-1604
             Project: Apache Jena
          Issue Type: Task
          Components: Jena
            Reporter: Niraj Patel

I am using Jena's QueryEngineHTTP for queries and RemoteUpdateRequest for updates. I would
like to send a custom header that will differ on each request. Our database, Allegrograph,
allows us to pass down custom headers while querying or updating in order to store that information
in access logs. For each SPARQL request we want to send down unique request markers and usernames
in order to be able to trace from a UI click to backend calls to queries that were performed
in the graph. I did some digging around and it seems like it's not possible. Using default
headers when configuring Apache's Http Client wouldn't work in this case. The suggestion
[~andy.seaborne] made was to create a request hook in HttpOp where we could add additional
headers as necessary. 

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