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https://issues.apache.org/jira/browse/HTTPCLIENT-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928358#comment-16928358
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Oleg Kalnichevski commented on HTTPCLIENT-2015:
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[~francium25] Timeouts define the maximum period of between two consecutive
network packets or i/o operations. They are not absolute values. For instance,
for multi-home DNS addresses HttpClient will attempt to connect to each defined
IP endpoints by default before throwing a timeout exception.
Oleg
> Connect timeout value is effective doubled
> ------------------------------------------
>
> Key: HTTPCLIENT-2015
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2015
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.5.10
> Environment: Debian-based Linux
> openjdk version "1.8.0_222"
> OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1-b10)
> OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
> Reporter: Chanseok Oh
> Priority: Minor
>
> The connection times out, say, after 6 seconds when calling
> `setConnectionTimeout(3000)`. The timeout value is effectively doubled. I've
> provided sample code, which demonstrates that the JDK Socket times out after
> 3 seconds, but the Apache HTTP Client times out after 6 seconds.
> This may seem like a minor bug to others, but our product functionality
> depends on timeouts in part and allows the user to adjust the timeouts, and
> this timeout-doubling-effect is causing some trouble to us.
> {code:java}
> public static void main(String[] args) {
> long started = System.nanoTime();
> try (Socket socket = new Socket()) {
> socket.connect(new InetSocketAddress("example.com", 81), 3000);
> } catch (IOException ex) {
> ex.printStackTrace(System.out);
> } finally {
> System.out.println("JDK elapsed (s): " + (System.nanoTime() - started)
> / 1000000000L);
> }
> try (CloseableHttpClient client = HttpClients.createDefault()) {
> HttpGet httpGet = new HttpGet("https://example.com:81";);
>
> httpGet.setConfig(RequestConfig.custom().setConnectTimeout(3000).build());
> long started2 = System.nanoTime();
> try (CloseableHttpResponse res = client.execute(httpGet)) {
> } finally {
> System.out.println("Apache elapsed (s): " + (System.nanoTime() -
> started2) / 1000000000L);
> }
> } catch (IOException ex) {
> ex.printStackTrace(System.out);
> }
> }
> {code}
>
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