One other thing to note, and perhaps <@U092308M7> ...
# ktor
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One other thing to note, and perhaps @orangy can chime in. SparkJava has been around for a while now as is quite stable. From what I can tell so far KTOR is quite a solid as well but it's still not a version one release (Though I haven't personally noticed any blocking issues yet). And they (ktor guys ) seem quite responsive. Plus they have this channel ­čÖé