HTTP interface client ignores @DateTimeFormat on path variable

[dominik-kovacs]

Affects: 6.0.0-M5

@DateTimeFormat is not formatting the path variable in the final URL.

example client:

public interface OpenBankingClient {

  @GetExchange("/periods/{token}/{dateFrom}/{dateTo}/transactions.json")
  OpenBankingTransactionsDto fetchTransactionsStatement(
      @PathVariable String token,
      @PathVariable @DateTimeFormat(iso = DateTimeFormat.ISO.DATE) LocalDate dateFrom,
      @PathVariable @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate dateTo);
}

client config:

@Configuration
public class RestClientConfig {

  @Bean
  public OpenBankingClient openBankingClient() throws Exception {
    WebClientAdapter webClientAdapter =
            WebClientAdapter.forClient(WebClient.create("https://example.com"));
    HttpServiceProxyFactory httpServiceProxyFactory = new HttpServiceProxyFactory(webClientAdapter);
    httpServiceProxyFactory.afterPropertiesSet();
    return httpServiceProxyFactory.createClient(OpenBankingClient.class);
  }
}

The desired string format of dateTo and dateFrom variables is yyyy-MM-dd.
-- for example, https://example.com/periods/xxx/2022-09-05/2022-09-06/transactions.json

What am I getting is MM/dd/yy (this may vary based on the locale) -- for example, https://example.com/periods/xxx/9%2F5%2F22/9%2F6%2F22/transactions.json