function return_message(status,msg)
    ngx.header.content_type = "application/json;"
    ngx.status = status
    ngx.say(json.encode(msg))
    ngx.exit(status)
end


function return_html(status,html)
    ngx.header.content_type = "text/html"
    ngx.status = status
    ngx.say(html)
    ngx.exit(status)
end

function read_file_body(filename)
	fp = io.open(filename,'r')
	if fp == nil then
        return nil
    end
	fbody = fp:read("*a")
    fp:close()
    if fbody == '' then
        return nil
    end
	return fbody
end