Vaadin Push has sometimes invalid json format

Hi everybody,

we currently sometimes are getting json erros which are related to vaadin push and we do not reall know how
to handle it / what the root cause of this problem is. Take this json for example:

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If you run this through a json validator you will quickly find the error here.
This is only happening sometimes and we cant really reproduce it.

We get this kind of error too. Are you using Spring-Boot?

Yes.

@Hennes

yes, currently we are using

id "org.springframework.boot" version "2.0.0.RELEASE"

which version are you using?

We use 2.0.2.RELEASE.

We use nginx in front of our web application. We can avoid the bug when we access our application directly by IP address instead of the domain.

Do you use nginx or something else?

Nope, we dont use anything like that.

I’m having the exact same issue (with the exact same invalid key).
Using Spring Boot 2.0.6.RELEASE and Vaadin 12.0.3

I didn’t have the issue until I started working on security. Now I have it when I get redirected to the Login page.

I’m following the method as described on https://vaadin.com/forum/thread/17085790/spring-boot-2-security-and-flow

Any ideas?

Kind regards,
Kristof

17477297.png