Can you explain how hitting /retry tests timeouts?

It looks like all this endpoint does is immediately return a 500
https://github.com/spring-cloud/spring-cloud-gateway/pull/3713/files#diff-a2252bbc8510b2b95c8edffb04415464d9b1c5840d8069753726236cf771d71dR346-R360

https://github.com/spring-cloud/spring-cloud-gateway/pull/3713/files#diff-a2252bbc8510b2b95c8edffb04415464d9b1c5840d8069753726236cf771d71dR394-R398

route：retry_with_backoff_timeout_test config:
retries:3
firstbackoff: 100ms factor:2
timeout 100ms

The final calculation result will result in backoff>timeout

But /httpbin/retry will never take 100ms it just immediately returns a 500 based on count
https://github.com/spring-cloud/spring-cloud-gateway/pull/3713/files#diff-a2252bbc8510b2b95c8edffb04415464d9b1c5840d8069753726236cf771d71dL322-L342

It seems like you would want to use /httpbin/sleep to test timeout functionality.

yes /httpbin/retry will return 500 immediately.

but i set backoff config. firstbackoff will delay 100ms . and backoff will increase exponential(factor 2).

i update the unit test to verfiy TestConfig.map key retry-with-backoff-timeout value is 2 .
this proves that after the first retry, the backoff will be greater than timeout, retry will terminate and then return the current response.

	@Test
	public void retryWithBackoffTimeout() {
		// backoff > timeout
		testClient.get()
			.uri("/retry?key=retry-with-backoff-timeout&count=3")
			.header(HttpHeaders.HOST, "www.retrywithbackofftimeout.org")
			.exchange()
			.expectStatus()
			.isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
		assertThat(TestConfig.map.get("retry-with-backoff-timeout")).isNotNull().hasValue(2);
	}

route config:

				.route("retry_with_backoff_timeout_test", r -> r.host("**.retrywithbackofftimeout.org")
					.filters(f -> f.prefixPath("/httpbin").retry(config -> {
						config.setRetries(3)
							.setBackoff(Duration.ofMillis(100), null, 2, true)
							.setTimeout(Duration.ofMillis(200));
					}))
					.uri(uri))