Tarantool HTTP Example

tarantool-http-example.lua

#!/usr/bin/env tarantool

box.cfg{}
space = box.space.data
if not space then
    space = box.schema.create_space('data')
    space:create_index('primary', { parts = {1, 'STR'} })
end

local function handler(self)
    local host = self.req.peer.host
    local response = {
        host = host;
        counter = space:inc(host);
    }
    self:render({ json = response })
end

require('http.server').new('127.0.0.1', 8080)
    :route({ path = '/' }, handler)
    :start()
 

Actually there is issue with your code. You forgot 'return'.
Correct handler function looks like:

local function handler(self)
    local host = self.req.peer.host
    local response = {
        host = host;
        counter = space:inc(host);
    }
    return self:render({ json = response })
end