Same queries - work in Postman, doesn't work in Retool. How to debug?

Have a good day guys!
I faced with the trouble. Trying to execute query with body:
[
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "01",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "02",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "03",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "04",
"plan_hours": "144"
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "05",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "06",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "07",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "08",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "09",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "10",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "11",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "12",
"plan_hours": null
}
]

And I get "socket hang up" error after timeout. And I couldn't find this request in my backend log. But! It works in Postman.
And if I delete some elements from body array and execute with this body for example:
[
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "01",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "02",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "03",
"plan_hours": null
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "04",
"plan_hours": "144"
},
{
"user_id": 26,
"project_id": 190,
"plan_year": 2022,
"plan_month": "05",
"plan_hours": null
}
]

It works in Retool! Fast and correct. And I see request in my backend log.
So the question - how could I debug and solve this problem?

Did you try to increase the timeout under the Advanced tab?
Screen Shot 2022-03-23 at 9.43.37 AM

Yes, shure. I set 60sec timeout - no result. I don't even find the request in backend log file. So there is another reason. Thnx for comment.