I am posting some data to the server and 1 out of 2 or 3 sequential requests (each request starts after the previous one is successfully finished) fail with
2023-02-07 14:37:12 Web file not found: WebStoreTabText.hal
and at the other end (initiating the request to the SERP) I am getting HTTP/1.0 503 error, which means the server is currently unable to handle the incoming requests.


Why is that?
WebStoreTabText is an like this:

global
updating procedure WebStoreTabText()
begin
...
WebGetPostData(FileArea);
qupdating.ImportSalesInvoicesFromArea(FileArea,...);
WebOutString("OK");
end;


I tried to make WebStoreTabText non updating and instead of qupdating call make it queued and in some cases data were stored successfully, but there was a timeout (over 30 secs) on the other end.


How should we process incoming requests in updating web calls?
I tried removing qupdating, but it didn't help.
As far as I can see in the source we have updating procedures in WebNG folder.