lets you dynamically run Lua code from Kong, before other plugins in each phase.
for eg. removing the header if it is blank.
local k_request = kong.request.get_header("Content-Type")
if k_request and (k_request == "application/json") then
local check_head = kong.request.get_raw_body()
if (not check_head) or (check_head == "") then
kong.service.request.clear_header("Content-Type")
end
end