[Question] CPU 100% Apache Ktor Http Client

Ktor Version

1.1.3

Ktor Engine Used(client or server and name)

Apache

JVM Version, Operating System and Relevant Context

Feedback

I utilize ktor http client to communicating from service to other service, but after 10 minutes deployment my machine experience CPU 100%, any idea why ?

here’s the building block that I use,

override fun sendAsync(request: HttpRequest, responseCallback: Callback<HttpResponse>) {
    GlobalScope.launch (Dispatchers.IO + CoroutineName(key ?: "")) {
      try {
        decorateRequest(request)

        val requestUrl = URL(request.url)
        val requestBody = String(request.body.asArray(), StandardCharsets.UTF_8)
        val requestMethod = HttpMethod(request.method)
        val requestContentType = createContentType(request)

        val clientResponse = httpClient!!.request<io.ktor.client.response.HttpResponse>{
          method = requestMethod
          url(requestUrl)
          body = TextContent(requestBody, requestContentType)

          request.headers.forEach {
            if (!unsafeHeaderSet.contains(it.name)) {
              header(it.name, it.value)
            }
          }
        }

        val response = HttpResponse()
        val responseBodyString = String(clientResponse.readBytes())
        response.statusCode = clientResponse.status.value
        response.bodyEncoding = "UTF-8"
        response.body = IndirectNIOBuffer(ByteBuffer.wrap(responseBodyString.toByteArray(charset("UTF-8"))), true)

        clientResponse.headers.forEach { name, value ->
          val headerValue = value.joinToString(",")

          response.addHeader(name, headerValue)
        }

        clientResponse.close()
        responseCallback.onComplete(response)
      } catch (error: Exception) {
        responseCallback.onException(error)
      }
    }
  }

[ok2c]

@e5l @IRus TLSv13 caused us a lot grief but as far as I can say all known issues have been resolved with HttpCore 4.4.12.

[IRus]

Apache Client one of the most feature complete, and production tested clients. This issue related to the newest JDK releases and particularly TSL v1.3 support. Still, this https://github.com/ktorio/ktor/issues/1018#issuecomment-565648818 fixes issue