我想做一个rest-put与一个etag从get接收到一个特定的资源，使用头if-match。我看到它不支持这个标题，我想知道是否有任何解决办法。我可以计算控制器中的etag吗？我是否应该发送get请求以查看etag是否同时更改？但在我的put请求到达服务器之前，这可能会改变。我怎么处理？

@ApiResponses({
        @ApiResponse(code = 200, message = "OK"),
        @ApiResponse(code = 500, message = "System Error")
})
@ApiOperation(value = "returns the updated meal", response = MealDTO.class, produces = MediaType.APPLICATION_JSON_VALUE)
@PutMapping("/meal/{mealId}")
public MealDTO updateMeal(
        @ApiParam(name = "userId", type = "long", value = "ID of the User", example = "-1")
        @PathVariable Long userId,
        @ApiParam(name = "mealId", type = "long", value = "ID of the meal", example = "-1")
        @PathVariable Long mealId,
        @ApiParam(name = "mealDTO", type = "MealDTO")
        @RequestBody MealDTO mealDTO
) throws Exception {
    log.debug("Entered class = MealController & method = updateMeal");
// do something with ShallowEtagHeaderFilter Bean here maybe?
    mealDTO.setId(mealId);
    var result = this.mealService.updateMeal(mealDTO, userId);
    socketHandler.notifySessions(result, Action.UPDATE, userId);
    return result;
}