run/websockets: "before all" hook for "can be reached by an HTTP request" failed

[flaky-bot[bot]]

Note: #2519 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: c08518adfb803cfeebf35413bafb2599a5c3026b buildURL: Build Status, Sponge status: failed