ResponseFilter of ClientFilter does not support MutableHttpResponse

[eratolekov]

Expected Behavior

The content-type of response of httpclient (HttpBinClient) is rewrited from application/json to text/plain

    @ResponseFilter
    fun filter(request: MutableHttpRequest<*>, response: MutableHttpResponse<*>) {
        response.headers.set("content-type", "text/plain")
    }

ps My goal is to fix a header of declarative httpclient's response. Some remote service returns broken content-type, I guess the best way to fix it is ResponseFilter of ClientFilter.

Actual Behaviour

The exception is raised:

Unexpected error occurred: class io.micronaut.http.client.netty.FullNettyClientHttpResponse cannot be cast to class io.micronaut.http.MutableHttpResponse (io.micronaut.http.client.netty.FullNettyClientHttpResponse and io.micronaut.http.MutableHttpResponse are in unnamed module of loader 'app')
java.lang.ClassCastException: class io.micronaut.http.client.netty.FullNettyClientHttpResponse cannot be cast to class io.micronaut.http.MutableHttpResponse (io.micronaut.http.client.netty.FullNettyClientHttpResponse and io.micronaut.http.MutableHttpResponse are in unnamed module of loader 'app')
	at com.github.mn.$HttpBinFilter$Definition$Exec.dispatch(Unknown Source)
	at io.micronaut.context.AbstractExecutableMethodsDefinition$DispatchedExecutableMethod.invokeUnsafe(AbstractExecutableMethodsDefinition.java:447)
	at io.micronaut.http.filter.FilterRunner$FilterMethod.filter0(FilterRunner.java:640)
	at io.micronaut.http.filter.FilterRunner$FilterMethod.filter(FilterRunner.java:629)
...

Steps To Reproduce

1. Run the project
2. Perform request curl -v -X GET "http://localhost:8080/json"
3. See stacktraces in application logs: Unexpected error occurred: class io.micronaut.http.client.netty.FullNettyClientHttpResponse cannot be cast to class io.micronaut.http.MutableHttpResponse (io.micronaut.http.client.netty.FullNettyClientHttpResponse and io.micronaut.http.MutableHttpResponse are in unnamed module of loader 'app')

Environment Information

OS: Windows 11 21H2 x64 JVM: 17.0.1 (Oracle Corporation 17.0.1+12-39) Micronaut 4.1.5: Gradle, Kotlin, Spock, Reactor, Netty

Example Application

https://github.com/eratolekov/micronaut-responsefilter-bug

Version

4.1.5