Basic query string encoder in Julia

Qstring.jl

using HttpCommon
using Dates

# Creating a query string that will encode unix datetimes
# given Julia DateTimes. Methods to handle more types could
# easily be added.
function qstring(kv::Tuple...)
  encodeval(v::String) = encodeURI(v)
  encodeval(dt::DateTime) = string(int64(datetime2unix(dt)))
  encodepair(p::Tuple) = string(encodeval(p[1]), "=", encodeval(p[2]), "&")
  q = string("?", join(map(encodepair, kv)))
  q[1:length(q) - 1]
end

# Let's test it!
@assert qstring(("a", "b"), ("c", "d")) == "?a=b&c=d"
@assert qstring(("date", unix2datetime(1424888079))) == "?date=1424888079"