Resteasy Reactive: Headers manipulated in ServerRequestFilter are not injected properly into rest method

[andreas-eberle]

Describe the bug

When modifying or create a new header in a @ServerRequestFilter annotated method (with or without preMatching = true) does not have an effect on method paramteres injected with @RestHeader or @HeaderParam.

E.g. for a method like

@GET
	@Produces(MediaType.TEXT_PLAIN)
	public String hello(
			@RestHeader("new-header") String newHeader,
			@RestHeader(HttpHeaders.USER_AGENT) String userAgent,
			HttpHeaders httpHeaders
	) { ... }

you will get the original header for the user agent field, no matter what you set to the headers via ContainerRequestContext.getHeaders().putSingle() in the @ServerRequestFilter annotated method.

However, the modified headers are available in the HttpHeaders object you can inject into the method.

Expected behavior

The injected headers should reflect the modified values.

Actual behavior

The injected headers contain the original request headers instead of the modified ones, which are only available from the HttpHeaders object.

How to Reproduce?

Reproducer:
2021-08-10_resteasy-reactive-modify-headers.zip

1. Download and unzip
2. Start quarkus with ./gradlew quarkusDev
3. Go to http://localhost:8080/hello
4. You will get a response listing the injected header value as well as the value available from the HttpHeaders object. I'd expect them to be the same.
5. Classes NewHeaderCreatingRequestFilter and UserAgentRequestFilter create a new header and modifiy the user agent header respectively.

Output of uname -a or ver

No response

Output of java -version

No response

GraalVM version (if different from Java)

No response

Quarkus version or git rev

2.1.1

Build tool (ie. output of mvnw --version or gradlew --version)

No response

Additional information

No response

[quarkus-bot]

/cc @FroMage, @geoand, @stuartwdouglas

[geoand]

I am on PTO (and I think the other folks mentioned by the bot are as well), so it might be a while before we take a look

[andreas-eberle]

Thanks for the update. Have a good time!

[andreas-eberle]

Thanks @stuartwdouglas !