The plus(+) sign received by @RequestParam is replaced by a blank

PythonQQ :

I'm trying to get an ISO String with @RequestParam and parse it to a Date.

Using code below, I tried to test with http://localhost:8989/api/v1/test?date=2019-08-19%2000:00:00.000+0000

But the result was 400 Bad Request, When I changed the type of date value to String, it was 2019-08-19 00:00:00.000 0000.

public class myController {

    @GetMapping(value = "/api/{version}/test", produces = "application/json")
    public ResponseEntity<MyList> getFreeList(
        @PathVariable
        String version,
        @RequestParam("date")
        @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss.SSSZ")
        Optional<Date> date) {
            return new ResponseEntity<>(myService.getList(
                date.orElse(null)),
                HttpStatus.OK);
    }
}

I can't change the URL format. How to get the plus sign properly?

Eyal :

Url parameters must be encoded

It's the caller's responsibility to do so. If the caller uses Java, he can simply set the value to be:

URLEncoder.encode("2019-08-19 000:00:00.000+0000", "UTF-8");

Which will be resolved to

2019-08-19%2000:00:00.000%2B0000