Ktor Client error when validating 200 responses with HttpResponseValidator - spring

Question

Ktor Client Version
1.6.7
Ktor Client Engine
CIO
JVM Version
1.8
Kotlin Version
1.6.10
Json Plugin
Jackson
Feedback:
The API that I'm calling returns errors with 200 HTTP Response and an error message in the response body, so I'm trying to validate the response with HttpResponseValidator but I get two kinds of errors depending on how I'm trying to get the response body.
This is the first one:
HttpClient {
install(JsonFeature)
HttpResponseValidator {
validateResponse { response ->
val responseBody = response.receive<Response>()
responseBody.sErrMsg?.let { message ->
when {
"Invalid Session ID" in message -> {
throw ResponseStatusException(
HttpStatus.UNAUTHORIZED,
message
)
}
}
}
}
}
defaultRequest {
url(URL)
headers {
contentType(ContentType.Application.Json)
}
timeout {
requestTimeoutMillis = timeoutInMillis
}
}
}
httpClient.post<Response> {
body = Request(
key = value
)
}
And I get:
io.ktor.client.call.DoubleReceiveException: Response already received: HttpClientCall[URL, 200 OK]
And this is the second way I'm trying to get the response body when doing the validation based on a similar issue (KTOR-643) but I'm facing another error:
HttpClient {
install(JsonFeature)
HttpResponseValidator {
validateResponse { response ->
val responseBody = ObjectMapper().readTree(response.readBytes())
val errorMessage = responseBody["ERROR_MESSAGE"]?.asText()
errorMessage?.let { message ->
when {
"Invalid Session ID" in message -> {
throw ResponseStatusException(
HttpStatus.UNAUTHORIZED,
message
)
}
}
}
}
}
defaultRequest {
url(URL)
headers {
contentType(ContentType.Application.Json)
}
timeout {
requestTimeoutMillis = timeoutInMillis
}
}
}
httpClient.post<Response> {
body = Request(
key = value
)
}
And I get:
com.fasterxml.jackson.databind.exc.MismatchedInputException: No content to map due to end-of-input
at [Source: (String)""; line: 1, column: 0]
at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) ~[jackson-databind-2.13.1.jar:2.13.1]
So basically all I get when doing receive() after readBytes() when validating is ""
Btw, I'm using Spring Boot and the HttpClient is injected and I'm making the call in a #Service