RuntimeException thrown in interceptor never notifies Call

If an okhttp3.Interceptor throws an exception, the suspend function in a Retrofit interface never completes (neither returning a value or throwing an exception).

A sample project demonstrating the issue with a simple JUnit test can be found here: https://github.com/robfletcher/retrofit-coroutines-hang

The real situation when I’ve encountered this is when an SSL handshake fails.

FWIW the same behavior is seen using https://github.com/JakeWharton/retrofit2-kotlin-coroutines-adapter with Retrofit 2.5.0

[Hodkinson]

Just adding a workaround here in case it helps. Actually in my case even IOExceptions are not propagating back. Retrofit 2.6.2, okhttp 4.2.0

I wanted to deal with this at point of call rather than add an UncaughtExceptionHandler.

So the workaround was to add an interceptor which catches any IOExceptions, and returns a blank response with a magic status code.

private val errorInterceptor = object : Interceptor {
        override fun intercept(chain: Interceptor.Chain): okhttp3.Response {
            return try {
                chain.proceed(chain.request())
            } catch (e: IOException) {
                okhttp3.Response.Builder()
                    .code(418)
                    .request(chain.request())
                    .body(object: ResponseBody() {
                        override fun contentLength() = 0L
                        override fun contentType(): MediaType? = null
                        override fun source(): BufferedSource = Buffer()
                    })
                    .message(e.message ?: e.toString())
                    .protocol(Protocol.HTTP_1_1)
                    .build()
            }
        }
    }

This could be combined with a Result object like in the answer here: https://stackoverflow.com/questions/57625272/retrofit-2-6-0-custom-coroutines-calladapterfactory where the status code or message is checked and a NetworkError returned.

[Nghicv]

Hi @robfletcher, are there any updates on this issue?