调用PATCH API方法返回400错误？

Question

我试图在 ABAP 中调用 PATCH 方法 API，但我总是收到代码 400，并带有错误消息，内容类型不受支持，其所需的 application/json 已在代码中设置。

    cl_http_client=>create_by_url(
      EXPORTING
        url                = lv_url
      IMPORTING
        client             = lo_client
      EXCEPTIONS
        argument_not_found = 1
        plugin_not_active  = 2
        internal_error     = 3
        OTHERS             = 4 ).
  
*   Set request parameter (Authorization)
    lo_client->request->set_header_field(
      name  = mc_param_name_authorization
      value = mc_auth_type_bearer && | { mv_access_token }|
    ).


*   Set request parameter (apiKey)
    lo_client->request->set_header_field(
      name  = mc_param_name_apikey
      value = CONV string( ms_access_settings-api_key )
    ).


*   Set request parameter (realm)
    lo_client->request->set_header_field(
      name  = mc_param_name_realm
      value = get_realm( mc_api_call_approve )
    ).
    lo_client->request->set_method( 'PATCH' ).
    lo_client->request->set_content_type( 'application/json' ).
    lo_http_client->request->set_cdata( lv_body_json ).

    lo_client->send( ).

    lo_client->receive(
      EXCEPTIONS
        http_communication_failure = 1
        http_invalid_state         = 2
        http_processing_failed     = 3
        OTHERS                     = 4 ).