Hi, I’m currently upgrading my project to ktor2. I...

# ktor

[doyaaaaaaken]

Hi, I’m currently upgrading my project to ktor2.
I use [CachingHeader plugin](https://ktor.io/docs/caching.html), and CachingOptions (io.ktor.server.http.content) class shows compile errors because it became to need expires parameter (non nullable).
As I know, If we want to return Cache-Control: no-cache as http response, then expires header is not required.
Why is this parameter required?

[Aleksei Tirman [JB]]

As I can see, the expires parameter is nullable with a default null value in Ktor 2.0.2:

public data class CachingOptions(val cacheControl: CacheControl? = null, val expires: GMTDate? = null)

So I can write a code like this:

install(CachingHeaders) {
    options { call, outgoingContent ->
        CachingOptions(CacheControl.NoCache(CacheControl.Visibility.Public))
    }
}

[doyaaaaaaken]

Oh, I used io.ktor.server.http.content.CachingOptions, but I replaces it with io.ktor.http.content.CachingOptions so it works well.
You made me aware of it.
Thank you.