Fiber Concurrency The :fiber_concurrency plugin enables connections a session to be used seamlessly across fibers managed by a fiber scheduler. This is of particular relevance if the connections are long-lived/persistent. Note that, if you’re using the :persistent plugin, this plugin is required by default. How to use http = HTTPX . plugin ( :fiber_concurrency ) Thread . start do # assuming fiber scheduler is set here 10 . times . each do Fiber . schedule do http . get ( "https://example.com" ) end end end Who is this for This plugin is a requirement if you’re using httpx in programs with a fiber scheduler. This includes, for example, programs developed using the async gem. Next: Custom Plugins