When I request a rest api that returns “202 accepted” I’m getting an error with Webflux. Requests that result in “200 ok” working fine.

Bellow the code:

fun requestPasswordReset(email: String) = Mono.just(
    Envelope(
        from = Email(from),
        to = listOf(Email(email)),
        subject = "Hello World",
        html = "<H1>Hello World!</H1>"
    )
).flatMap(mailerSendClient::send)
    .doOnError {
        println(it.message)//202 accepted as WebClientResponseException here

        }

Here is my interface:

@HttpExchange("/v1/email")
fun interface MailerSendClient {


    @PostExchange
    fun send(@RequestBody envelope: Envelope): Mono<Unit>
}

And my webclient config:

@Bean
fun createMailerSendClient(
    @Value("${mailer-send.api.uri}") baseUrl: String,
    @Value("${mailer-send.api.token}") token: String
): MailerSendClient {
    val client = WebClient.builder()
        .baseUrl(baseUrl)
        .defaultHeader(HttpHeaders.AUTHORIZATION, "Bearer $token")
        .build()

    return httpServiceProxyFactory(client, MailerSendClient::class.java)
}

fun <T> httpServiceProxyFactory(webClient: WebClient, clazz: Class<T>) =
    HttpServiceProxyFactory.builderFor(WebClientAdapter.create(webClient)).build()
        .createClient(clazz)

It works ok, I’m able to send the email but I’m getting this strange behaviour. What am I missing?