Many HTTP POST calls

Dear Staff.

In our logs we traced many calls like /?packlink_pro_controller=Async_Process&action=run&guid=3099_6150217c4b1257.25070646, one call each 10 sec (almost)

XXX.XXX.XXX.XXX - - [26/Sep/2021:08:58:46 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2164_61501a25124926.28732912 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:58:53 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1295_61501a2c0049d4.00324635 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:58:59 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2640_61501a32cf8203.67645628 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:06 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2641_61501a39c2f3f9.78520337 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:13 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1195_61501a40a25d29.03434327 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:20 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2166_61501a4783cf87.08386108 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:27 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1708_61501a4e6ca876.21989626 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:34 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1711_61501a55459c71.45335880 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:41 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=26949_61501a5c203a33.86461605 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:48 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=773_61501a6345c160.41560856 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:08:59:55 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1295_61501a6a28f9c2.62637645 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:02 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2638_61501a70eb1453.68882541 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:15 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2640_61501a7e084265.92317763 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:22 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2166_61501a85b005e1.76439153 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:29 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1708_61501a8cd9ab33.35092403 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:36 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=1711_61501a93a92510.65735767 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:43 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=26949_61501a9a7eb854.83274598 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:50 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2164_61501aa15acb11.35288258 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:00:57 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=773_61501aa84cdc78.76652772 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:01:04 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=2638_61501aaf2dd739.11157317 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"
XXX.XXX.XXX.XXX - - [26/Sep/2021:09:01:11 +0200] "POST /?packlink_pro_controller=Async_Process&action=run&guid=3099_61501ab62d3c68.17310046 HTTP/1.1" 499 0 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36"

We got many 499 errors, we have to go deep with our analysis, but the problem is that all POST bypass Varnish cache and load a lot our application

Can we have more info about it? Is it possible to change the scheduler?

Thanks

Diego

The page I need help with: [log in to see the link]