Describing of context: java app (running under wildfly) works under high workload and heap is almost filled. Because of that full GC runs often and this leads to frequent long Stop The World phases.

While these phases I try to make login request. So, if I make this request via front-end side (I just open login page, fill fields and click login button) I see this:

It is interesting that I get canceled request ALWAYS after 50 seconds and front-end even canot make tcp handhaske.

But if I make the same direct request just using console devtools of chrome (alternative is using postman, for example), I see this:

In that case browser establish tcp handshake, send reqiest and wait 2,6 mint for first byte from the server etc,.

Why I see that difference behavioral ? What is root cause of that ?