fix(http1): fix preserving header case without enabling ffi (#2820)
fix(http1): fix preserving header case without enabling ffi (#2820)

The previous commit broke this, but it wasn't released, so released versions will never notice the breakage.
tshepang/hyper,tshepang/hyper,tshepang/hyper,hyperium/hyper,hyperium/hyper,hyperium/hyper