Hey all, I’ve setup my Ktor client with both HttpT...

# ktor

[Jorge Domínguez]

Hey all, I’ve setup my Ktor client with both HttpTimeout and HttpRequestRetry plugins. Currently I’m facing an issue when using retryOnExceptionIf where I get a CancellationException instead of a HttpRequestTimeoutException when a timeout happens. This is preventing me from retrying timed out requests and using retryOnException(… retryOnTimeout = true) doesn’t seem to work either. There seems to be mention of this already here, but I can’t find a solution. Is this a known issue?

[Aleksei Tirman [JB]]

Can you please share a code snippet to reproduce it?

[Jorge Domínguez]

thanks for the reply, I was trying to create a snippet so I modified the Client Retry sample but I can see the issue is not reproducible there, the retryOnExceptionIf does get a HttpRequestTimeoutException. It’s worth noting that the cause property of the CancellationException I get is of type HttpRequestTimeoutException, does that hint something? also I’m using Charles proxy in my project to simulate the timeout

[Aleksei Tirman [JB]]

No. That's expected:

val killer = scope.launch {
    delay(requestTimeout)
    val cause = HttpRequestTimeoutException(request)
    LOGGER.trace("Request timeout: ${request.url}")
    executionContext.cancel(cause.message!!, cause)
}

[Jorge Domínguez]

I see, I still can’t wrap my head around why this happens though, what determines if the exception will be a HttpRequestTimeoutException or a CancellationException?

[Aleksei Tirman [JB]]

It's difficult to say without the code