Не отправляется пост запрос на https://kad.arbitr.ru/Kad/SearchInstances

Что не так? Заголовки указал, но отправляет ошибку.

Ошибки и тд:

Заголовки:

Host: kad.arbitr.ru
Content-Length: 0
Accept: application/json
Accept-Language: en-US,en;q=0.9,ru;q=0.8
Connection: keep-alive
Content-Length: 128
Content-Type: application/json
Cookie: CUID=7e1b50a0-2336-4054-8def-4d5ae2027ac5:TFzHrBpdshqaPG+PUVK2pQ==; _ga=GA1.2.717610766.1616405337; _ym_uid=1616405339169640867; _ym_d=1616405339; tmr_lvid=6f8904fe3cda89871a125c344e049bf1; tmr_lvidTS=1616405340439; .ASPXAUTH=F9CC19474E55EF627C7A56677437D839490C2F23CE1F101E42D17674C086C3DD38ED577E9649ADDBEF8D843FEBD2BB9CFBC6BE56316C5D852E95AFF80645023E548E4BAF119B6F3E11303069AE733F20A39D33860BD5CB2F2E5381DBA6377DC6DB965AC1; Notification_All=b4065a6530a34322bb59dae9c84e55ed_1618261200000_shown; _fbp=fb.1.1616866575060.1234424134; KadLVCards=%d0%9056-24251%2f2021~%d0%9056-24252%2f2021~%d0%9084-1532%2f2021~%d0%9081-2387%2f2021~%d0%9084-1439%2f2021; _gid=GA1.2.947744914.1617283680; _ym_isad=2; ASP.NET_SessionId=w0j20f1sx3rp3kco1qwve0pc; pr_fp=a03b4918e200e179f875f89a461312f1173e1f4edfdf235d69d9d3740cdf021c; tmr_detect=1%7C1617351472345; tmr_reqNum=345; wasm=1e1ea3fb48cae3ce97b9cc05a1a1016c; rcid=79f8e70e-d65f-400c-936a-8fbecb09698b
Origin: https://kad.arbitr.ru
Referer: https://kad.arbitr.ru/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)         Chrome/89.0.4389.90 Safari/537.36
x-date-format: iso
X-Requested-With: XMLHttpRequest
{Page: 1, Count: 25, Courts: [], DateFrom: null, DateTo: null, Sides: [], Judges: [], CaseNumbers: [],…}