Springboot RestClient 404 not found though address does exist

Question

I am trying to make a Call by the org.springframework.web.client.RestClient.

The address/resource does definetly exist GET http://localhost:8080/someResource.
It is retrievable by simple call in the browser or via curl.

Using the RestClient returns a 404 - not found. Why is it that way. What do I have to tweak to get a 200 success answer?

final var restClient = RestClient.create(); String result = restClient.get() .uri("http://localhost:8080/someResource") .header("User-Agent", "Mozilla/5.0") .accept( MediaType.ALL ) .retrieve() .body(String.class);

Also the IntelliJ's http tooling (https://www.jetbrains.com/help/idea/http-client-in-product-code-editor.html) also does return a 404.

Strange to say, e.g. a request with RestClient to https://google.com does properly work.

I build an even more simplified example on github which does not work, see test class test.Tester: https://github.com/greyshine/springboot-simple-http-call

Is there a special minimal set of headers needed or anything else?

A call on the browser does work.
A call via curl localhost:8080/test-get does work.
A call via RESTer Chrome extension does work.

@shaileshpatil no that doesn't do the job. I used the example from here stackoverflow.com/a/70044681/845117 — Dirk Schumacher
– Dirk Schumacher, Commented Aug 10 at 8:53
Well if other tools (i.e. Inteij client are also getting a 404 it does not sound like your call is the problem. That suggests there is some problem with what ever is serving up the localhost:8080/someResource URL. What does it show is happening when it gets the request? — BrianC
– BrianC, Commented Aug 12 at 15:27
Oh. Might be this. What MIME type is the end point you are calling configured to accept? JSON maybe? .accept( MediaType.ALL ) — BrianC
– BrianC, Commented Aug 12 at 15:28
@BrianC that will not do it either. I build the example on github, as stated in my updated question... — Dirk Schumacher
– Dirk Schumacher, Commented Aug 22 at 20:20

Dirk Schumacher · Accepted Answer · 2025-08-31 06:41:02Z

Well, I did get it running. No code change it does work properly as expected when I programmed it.

I guess this is an issue with IntelliJ and not the programming.
I observed that when 'messing' around with IntelliJ and Springboot-Web there is sometimes an nginx process in the background which 'still' serves requests on the http port though the web-app with the same port is shut down (on error or properly).
I may be mistaken that the process is started by intellij i.e. the springboot app. I will keep watching this.
(Using Springboot 3.5.0, Oracle OpenJdk22, IntelliJ 2024.1.7 UE)
Thanks to all who had an eye on it.

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