Github user krlohnes commented on the issue: https://github.com/apache/tinkerpop/pull/767 @spmallette As far as criticality, that's fairly dependent on the usage of custom authentication handlers in the wild. It's not impacting my current work or any of the work I did at IBM Compose right now, but it breaks anyone using custom http authentication (e.g. the JanusGraph issue linked to this), so that's pretty bad. That, however, only impacts JanusGraph master right now that I know of though, so it's not impacting an official release there at the moment. So not too bad if there's a patch version planned FSVO soon. I wish I'd caught it before the last one that just went out.
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