I don't understand how this makes sense

When I used it this way it never worked as expected, and after looking up a lot of information and source code I found that it only needed the url not to be equal to the empty string to work.

But the official comments don't explain much, so this will help other developers who are careless like me.

	@FeignClient(name = "dynamic")
	interface DynamicClient {

		@RequestLine("GET /")
		String get(URI uri);
	}

Can you please provide a complete, minimal, verifiable sample (something that we can unzip attached to this issue or git clone, build, and deploy) that reproduces the problem.

Of course, please run this unit test directly to reproduce it.

https://github.com/crossoverJie/spring-cloud-openfeign/blob/c3c6973451dbbb3b7b43d9ad6b41d8e498c41cc7/spring-cloud-openfeign-core/src/test/java/org/springframework/cloud/openfeign/FeignClientErrorDecoderTests.java#L74

Hello, @crossoverJie; thanks for submitting a PR. The 2.2.x branch is no longer supported. The test you've provided does not reproduce a valid use-case. Also, it lacks any assertion. Apart from this, I don't think we should be adding a String constant just for the benefit of linking to it from the javadoc.