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how throw a custom exception in JSONAPI?

In D8 i’m trying to throw custom exceptions for extra validations that i need to do before the content is saved in my custom entity, but when i do the validations in the presave method and throw a normal Exception:

public function preSave(EntityStorageInterface $storage) {    throw new Exception("The content is duplicated", 409); }

The response of JSONAPI is code 500 Internal Server Error and the response:

{ "jsonapi": {     "version": "1.0",     "meta": {         "links": {             "self": {                 "href": "http://jsonapi.org/format/1.0/"             }         }     } }, "errors": [     {         "title": "Internal Server Error",         "status": "500",         "detail": "The content is duplicated",         "links": {             "via": {                 "href": "http://site.docksal/jsonapi/content_entity/content_entity"             },             "info": {                 "href": "http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1"             }         }     } ]

}

how can i control de error Code, title, status and detail.

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how throw a custom exception in JSONAPI?

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