Web Service call using system.net.httpClient

Ignition
,
1

Hi All, my first post here. Hopefully up to standards!

I have been tasked with setting up communication with WebServices from Gateway and I have some problems sending the data.

  • The Gateway sits on industrial network,
  • I have been assured the Firewall exceptions were added,
  • *.PEM certificates were copied to gateway PC windows Certificate stores and Ignition KeyStores - the gateway was restarted.

The connection from Gateway PC was tested by standalone(vbs) script and is returning desired value from WebService.
Initially I have tried urllib2 to make a call, it is working from my laptop from corporate network but didn't from the Gateway script(I probably need to add certificates to JavaWrapper configuration?)

Since then we moved to system.net.httpClient using a simple script below(increasing/adding timeout didn't help):

from java.lang import Exception as JavaException

#logger
logger = system.util.getLogger("test")

# Credentials
username = username
password = secret

# URL to send the request to
url = "https://urlhere.com"

# XML payload as a string
xml_payload = """
<Request>
    <Item>REDACTED</Item>
</Request>
"""

# Create a dictionary with headers for XML content type
headers = {
    "Content-Type": "application/xml"
}

# Specify a timeout (in milliseconds)
timeout = 30000

# Create an HTTP client with the specified timeout and credentials
client = system.net.httpClient(timeout=timeout, username=username, password=password)

try:
    # Make a POST request with the XML payload
    response = client.post(url, data=xml_payload, headers=headers)

    # Check the response
    if response.good:
        # Log successful response
        logger.info("Successful POST to URL: %s with response status code: %s" % (url, response.statusCode))
        logger.info("Response Body: %s" % response.text)
    else:
        # Log error response
        logger.error("Error POSTing to URL: %s with response status code: %s" % (url, response.statusCode))
        logger.error("Response Body: %s" % response.text)

except JavaException as je:
    # Log Java Exception
    logger.error("Java Exception occurred while POSTing to URL: %s" % url, je)
    je.printStackTrace()

except Exception as e:
    # Log Python Exception
    logger.error("Python Exception occurred while POSTing to URL: %s" % url, e)

and this is the message from gateway logger:

java.io.IOException: Unable to POST https:/urlhere.com

at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.send(JythonHttpClient.java:103)

at com.inductiveautomation.ignition.common.script.builtin.http.JythonHttpClient.post(JythonHttpClient.java:318)

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:190)

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._pyx9.f$0(:144)

at org.python.pycode._pyx9.call_function()

at org.python.core.PyTableCode.call(PyTableCode.java:173)

at org.python.core.PyCode.call(PyCode.java:18)

at org.python.core.Py.runCode(Py.java:1687)

at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:804)

at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$TrackingProjectScriptManager.runCode(ProjectScriptLifecycle.java:843)

at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:752)

at com.inductiveautomation.ignition.gateway.project.ProjectScriptLifecycle$TrackingProjectScriptManager.runCode(ProjectScriptLifecycle.java:824)

at com.inductiveautomation.ignition.common.script.TagChangeScriptExecutor$TagChangeExecutionCallback.execute(TagChangeScriptExecutor.java:242)

at com.inductiveautomation.ignition.common.script.TagChangeScriptExecutor$TagChangeExecutionCallback.execute(TagChangeScriptExecutor.java:194)

at com.inductiveautomation.ignition.common.util.SerialExecutionQueue$PollAndExecute.run(SerialExecutionQueue.java:102)

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 java.base/java.lang.Thread.run(Unknown Source)

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:101)

... 26 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

and I am just wondering what I am missing in order to make that connection/call.
Please let me know if I can provide more information. We are on Ignition 8.1.

2

A connect timed out means whatever you're talking to isn't responding at all. Corporate firewall is likely to blame. Make sure there's an open tunnel between your target service and your gateway on the HTTPS port (443 unless otherwise specified).

1 Like
3

Thanks @PGriffith, I will forward to IT to check.

Edit:
it were the ports in the end. Thank you for your help!

1 Like