How can i use PATCH Method in Bonita?

I'm trying to call PATCH service from bonita.
I see bonita only supporting GET,POST,DELETE,PUT methods. Is there any way i can call PATCH method.

Can't upload a case document through /bpm/caseDocument POST request

Using bonitaVersion: 7.3.2
I'm not able to upload a document through ../bpm/caseDocument POST request
request_payload is
{"caseId": 38012, "file":"test.doc", "name":"myTestList","fileName":"test_1.doc", "name":"testfiles", "description":""}
and response is
"exception": "class java.lang.IllegalArgumentException",
"message": "Can't parse JSon",
"stacktrace": [