# system.net.httpClient issue on particular machine **URL:** \ **Category:** Ignition\ **Created:** [July 12, 2021, 4:26pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748 "2021-07-12T16:26:18Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![idekelly.d.king](https://avatars.discourse-cdn.com/v4/letter/i/6bbea6/32.png) [@idekelly.d.king](https://forum.inductiveautomation.com/u/idekelly.d.king)\ **Post date:** [July 12, 2021, 4:26pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748/1 "2021-07-12T16:26:18Z")
I am having a similar issue and I’ve uninstalled/re-installed designer a few times, but it doesn’t help. Trying to run the example below in the script Console doesn’t work. But if I paste the same code in a MessageHandler and then use system.util.sendRequest. It works fine… `client ` `=` `system.net.httpClient()` `# Send a non-blocking request to an endpoint that will wait 3 seconds` `promise ` `=` `client.getAsync(` `"https://httpbin.org/delay/3"` `, params` `=` `{` `"a"` `: ` `1` `, ` `"b"` `: ` `2` `})` ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 12, 2021, 4:32pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748/2 "2021-07-12T16:32:37Z")
A `NoClassDefFound` error almost always implicates a faulty upgrade process; the `PyArgParser` class called out in the OP (you don’t mention if you’re getting the exact same error) is always available in all scopes in Ignition, so the only way it couldn’t be available is if Ignition itself is using old code. ---
**Author:** ![idekelly.d.king](https://avatars.discourse-cdn.com/v4/letter/i/6bbea6/32.png) [@idekelly.d.king](https://forum.inductiveautomation.com/u/idekelly.d.king)\ **Post date:** [July 12, 2021, 5:19pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748/3 "2021-07-12T17:19:29Z")
here’s the error I’m getting: ```auto Java Traceback: Traceback (most recent call last): File "", line 5, in at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:94) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.get(JythonHttpClient.java:296) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) java.io.IOException: java.io.IOException: Unable to GET https://httpbin.org/get?a=1&b=2 at org.python.core.Py.JavaError(Py.java:552) at org.python.core.Py.JavaError(Py.java:543) at org.python.core.PyReflectedFunction. __call__ (PyReflectedFunction.java:190) at org.python.core.PyObject. __call__ (PyObject.java:438) at org.python.core.PyMethod.instancemethod ___call__ (PyMethod.java:237) at org.python.core.PyMethod. __call__ (PyMethod.java:228) at org.python.pycode._pyx26.f$0(:10) at org.python.pycode._pyx26.call_function() at org.python.core.PyTableCode.call(PyTableCode.java:171) at org.python.core.PyCode.call(PyCode.java:18) at org.python.core.Py.runCode(Py.java:1614) at org.python.core.Py.exec(Py.java:1658) at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:276) at org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.java:131) at com.inductiveautomation.ignition.designer.gui.tools.jythonconsole.JythonConsole$ConsoleWorker.doInBackground(JythonConsole.java:605) at com.inductiveautomation.ignition.designer.gui.tools.jythonconsole.JythonConsole$ConsoleWorker.doInBackground(JythonConsole.java:593) at java.desktop/javax.swing.SwingWorker$1.call(Unknown Source) at java.base/java.util.concurrent.FutureTask.run(Unknown Source) at java.desktop/javax.swing.SwingWorker.run(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) Caused by: java.io.IOException: Unable to GET https://httpbin.org/get?a=1&b=2 at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:94) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.get(JythonHttpClient.java:296) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.python.core.PyReflectedFunction. __call__ (PyReflectedFunction.java:188) ... 19 more Caused by: java.net.ConnectException at java.net.http/jdk.internal.net.http.HttpClientImpl.send(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientFacade.send(Unknown Source) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:92) ... 25 more Caused by: java.net.ConnectException at java.net.http/jdk.internal.net.http.common.Utils.toConnectException(Unknown Source) at java.net.http/jdk.internal.net.http.PlainHttpConnection.connectAsync(Unknown Source) at java.net.http/jdk.internal.net.http.AsyncSSLConnection.connectAsync(Unknown Source) at java.net.http/jdk.internal.net.http.Http2Connection.createAsync(Unknown Source) at java.net.http/jdk.internal.net.http.Http2ClientImpl.getConnectionFor(Unknown Source) at java.net.http/jdk.internal.net.http.ExchangeImpl.get(Unknown Source) at java.net.http/jdk.internal.net.http.Exchange.establishExchange(Unknown Source) at java.net.http/jdk.internal.net.http.Exchange.responseAsyncImpl0(Unknown Source) at java.net.http/jdk.internal.net.http.Exchange.responseAsyncImpl(Unknown Source) at java.net.http/jdk.internal.net.http.Exchange.responseAsync(Unknown Source) at java.net.http/jdk.internal.net.http.MultiExchange.responseAsyncImpl(Unknown Source) at java.net.http/jdk.internal.net.http.MultiExchange.lambda$responseAsyncImpl$7(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.uniHandle(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.uniHandleStage(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.handle(Unknown Source) at java.net.http/jdk.internal.net.http.MultiExchange.responseAsyncImpl(Unknown Source) at java.net.http/jdk.internal.net.http.MultiExchange.lambda$responseAsync0$2(Unknown Source) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientImpl$DelegatingExecutor.execute(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.completeAsync(Unknown Source) at java.net.http/jdk.internal.net.http.MultiExchange.responseAsync(Unknown Source) at java.net.http/jdk.internal.net.http.HttpClientImpl.sendAsync(Unknown Source) ... 28 more Caused by: java.nio.channels.UnresolvedAddressException at java.base/sun.nio.ch.Net.checkAddress(Unknown Source) at java.base/sun.nio.ch.SocketChannelImpl.connect(Unknown Source) at java.net.http/jdk.internal.net.http.PlainHttpConnection.lambda$connectAsync$0(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Native Method) ... 51 more Traceback (most recent call last): File "", line 5, in at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:94) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.get(JythonHttpClient.java:296) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) java.io.IOException: java.io.IOException: Unable to GET https://httpbin.org/get?a=1&b=2 ``` ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 12, 2021, 6:43pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748/4 "2021-07-12T18:43:29Z")
> [@idekelly.d.king](#): > > `Caused by: java.nio.channels.UnresolvedAddressException` Your local machine (at least within the context of Java) can't resolve `httpbin.org`. Are you behind a restrictive firewall, have custom DNS, custom hosts file, etc? Does `google.com` work, or some other test site? What about an internal site (even the gateway address itself?) It's unrelated to the error in the original thread, so I split this off to a new thread. ---
**Author:** ![idekelly.d.king](https://avatars.discourse-cdn.com/v4/letter/i/6bbea6/32.png) [@idekelly.d.king](https://forum.inductiveautomation.com/u/idekelly.d.king)\ **Post date:** [July 14, 2021, 4:12pm UTC](https://forum.inductiveautomation.com/t/system-net-httpclient-issue-on-particular-machine/48748/5 "2021-07-14T16:12:02Z")
I am behind a firewall that doesn’t allow access to external addresses.