Anyone got Ktor Client (2.0.0-beta1) to force a result from http cache using an

only-if-cached

cache control header? Ktor always responds with status code 504 even if there is a non-stale result in cache.

Could you please share a code snippet to illustrate your issue?

Configure the client engine with:

install(HttpCache)

Send some request:

httpClient.get("SOME_URL") {
    header(HttpHeaders.CacheControl, "only-if-cached")
}

Shouldn’t fail with status code 504 if there is a response in the http cache, but it does.

Could you please describe what should be returned from a server for

SOME_URL

endpoint or give a link to public resource?

In our case, it’s a private REST API that delivers JSON. The response contains correct ETag and Cache-Control headers to work properly with the HttpCache.

Is it about Ktor client for the browser JS target?

No Android / iOS