httpCIient() HTTP Timeout from Project Script

dkhayes117 · May 15, 2025, 12:41pm

v8.1.44
I have a project script with a top-level variable holding a reference to a system.net.httpClient()

client = system.net.httpClient()

In another project script, I reference the client variable to call an API.

client = logistics.api.http.client
apiMethod = 'locations'
url = logistics.api.http.formatUrl(apiClass, apiMethod)
	
session_token = logistics.api.http.getSessionToken()
params = {'session_token':session_token}
#------------------------------------------------------------------------------------------------#
response = client.get(url, params=params)
...

Some days everything works perfect in the perspective project. Then other days, I get nothing but http timeout errors when calling the APIs. Copy/paste the URL into a browser and it runs perfect.

Gateway Error

com.inductiveautomation.ignition.common.script.JythonExecException: Traceback (most recent call last): File "", line 2, in runAction File "", line 157, in refreshList at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:104) at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.get(JythonHttpClient.java:308) at jdk.internal.reflect.GeneratedMethodAccessor1490.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://api.gpsinsight.com/v2/driver/list?session_token=<myToken>
at org.python.core.Py.JavaError(Py.java:545)
at org.python.core.Py.JavaError(Py.java:536)
at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:192)
at org.python.core.PyObject.__call__(PyObject.java:422)
at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:237)
at org.python.core.PyMethod.__call__(PyMethod.java:228)
at org.python.pycode._pyx185424.refreshList$2(:167)
at org.python.pycode._pyx185424.call_function()
at org.python.core.PyTableCode.call(PyTableCode.java:173)
at org.python.core.PyBaseCode.call(PyBaseCode.java:306)
at org.python.core.PyBaseCode.call(PyBaseCode.java:112)
at org.python.core.PyFunction.__call__(PyFunction.java:406)
at org.python.pycode._pyx185423.runAction$1(:2)
at org.python.pycode._pyx185423.call_function()
at org.python.core.PyTableCode.call(PyTableCode.java:173)
at org.python.core.PyBaseCode.call(PyBaseCode.java:306)
at org.python.core.PyFunction.function___call__(PyFunction.java:474)
at org.python.core.PyFunction.__call__(PyFunction.java:469)
at org.python.core.PyFunction.__call__(PyFunction.java:464)
at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:847)
at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:829)
at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$TrackingProjectScriptManager.runFunction(ProjectScriptLifecycle.java:868)
at com.inductiveautomation.ignition.common.script.ScriptManager$ScriptFunctionImpl.invoke(ScriptManager.java:1010)
at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$AutoRecompilingScriptFunction.invoke(ProjectScriptLifecycle.java:950)
at com.inductiveautomation.perspective.gateway.script.ScriptFunctionHelper.invoke(ScriptFunctionHelper.java:161)
at com.inductiveautomation.perspective.gateway.script.ScriptFunctionHelper.invoke(ScriptFunctionHelper.java:98)
at com.inductiveautomation.perspective.gateway.action.ScriptAction.runAction(ScriptAction.java:80)
at com.inductiveautomation.perspective.gateway.action.ActionDecorator.runAction(ActionDecorator.java:18)
at com.inductiveautomation.perspective.gateway.action.SecuredAction.runAction(SecuredAction.java:44)
at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.lambda$call$0(ActionCollection.java:263)
at com.inductiveautomation.perspective.gateway.api.LoggingContext.mdc(LoggingContext.java:54)
at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:252)
at com.inductiveautomation.perspective.gateway.model.ActionCollection$ActionSequence$ExecuteActionsTask.call(ActionCollection.java:221)
at com.inductiveautomation.perspective.gateway.threading.BlockingTaskQueue$TaskWrapper.run(BlockingTaskQueue.java:154)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at com.inductiveautomation.perspective.gateway.threading.BlockingWork$BlockingWorkRunnable.run(BlockingWork.java:58)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.python.core.PyException: java.io.IOException: java.io.IOException: Unable to GET https://api.gpsinsight.com/v2/driver/list?session_token=<myToken>
... 40 common frames omitted
Caused by: java.io.IOException: Unable to GET https://api.gpsinsight.com/v2/driver/list?session_token=<myToken>
at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:104)
at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.get(JythonHttpClient.java:308)
at jdk.internal.reflect.GeneratedMethodAccessor1490.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:190)
... 37 common frames omitted
Caused by: java.net.http.HttpConnectTimeoutException: HTTP connect timed out
at java.net.http/jdk.internal.net.http.HttpClientImpl.send(Unknown Source)
at java.net.http/jdk.internal.net.http.HttpClientFacade.send(Unknown Source)
at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:102)
... 42 common frames omitted
java.net.http.HttpConnectTimeoutException: HTTP connect timed out
at java.net.http/jdk.internal.net.http.MultiExchange.toTimeoutException(Unknown Source)
at java.net.http/jdk.internal.net.http.MultiExchange.getExceptionalCF(Unknown Source)
at java.net.http/jdk.internal.net.http.MultiExchange.lambda$responseAsyncImpl$7(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.uniHandle(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(Unknown Source)
at java.net.http/jdk.internal.net.http.Exchange.checkCancelled(Unknown Source)
at java.net.http/jdk.internal.net.http.Exchange.cancel(Unknown Source)
at java.net.http/jdk.internal.net.http.MultiExchange.cancel(Unknown Source)
at java.net.http/jdk.internal.net.http.PlainHttpConnection$ConnectTimerEvent.handle(Unknown Source)
at java.net.http/jdk.internal.net.http.HttpClientImpl.purgeTimeoutsAndReturnNextDeadline(Unknown Source)
at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.run(Unknown Source)
Caused by: java.net.ConnectException: HTTP connect timed out
... 13 common frames omitted

pturmel · May 15, 2025, 12:50pm

That's pretty definitively not an Ignition problem. That is a network issue or firewall issue between your gateway and your API server. Or, perhaps, a rate limiter on the API server.

(Testing elsewhere is meaningless.)

You will need IT help to pinpoint it. You probably should use wireshark to capture traffic when this happens. It will almost certainly show unanwered SYN packets for the connection attempts.

dkhayes117 · May 15, 2025, 12:57pm

As soon as I fired up wireshark on the gateway, it started working I'll have to wait for the next outage before I can capture anything.