local function urlEncode(s)  
     s = string.gsub(s, "([^%w%.%- ])", function(c) return string.format("%%%02X", string.byte(c)) end)  
    return string.gsub(s, " ", "+")  
end  

local function urlDecode(s)  
    s = string.gsub(s, '%%(%x%x)', function(h) return string.char(tonumber(h, 16)) end
 
)  
    return s  
end  

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