Http4s improperly parses User-Agent and Server headers
ImpactThe `User-Agent` and `Server` header parsers are susceptible to a fatal error on certain inputs.  In http4s, modeled headers are lazily parsed, so this only applies to services that explicitly request these typed headers.v0.21.xv0.22.x, v0.23.x, v1.xPatchesFixes are released in 0.21.34, 0.22.15, 0.23.17, and 1.0.0-M38.WorkaroundsUse the weakly typed header interfacev0.21.xv0.22.x, v0.23.x, v1.x