JSON_PARSER_ERROR in REST consuming Service

Hi All,

I am updating the External system Service(Sales Force) through REST API's using SAP ABAP. I'm giving the inputs as specified below.

Requested Body in the form Of JSON:

  body = '{ "City" : "Newyork" } '.

     lv_body = body.

Sending Request

  http_client->request->set_header_field( name  = '~request_method'

    value = 'PATCH' ).

while executing the report i am getting the below message in the content field.

[{"message":"The HTTP entity body is required, but this request has no entity body.","errorCode":"JSON_PARSER_ERROR"}]

Please kindly help me on this.

Thanks,

Harikrishna