bug report: POST request tool / headers not sent

KNIME Analytics Platform
1

Hi all,

I’m trying to work with the POST request tool to interact with a web page.

I have specified a number of headers for the request in the tool’s configuration.

All the headers starting with ‘Sec-Fetch’ are not sent.

I have tested this by replacing my destination URL with https://httpbin.org/anything which echoes the request back in the response.

The response that comes back does not contain any of those headers.

In Postman, I am able to send these headers both to the website, and to httpbin and see them echoed back to me.

I’ve attached a very simple workflow demonstrating this behaviour.

Any advice or suggestions would be very welcome.

Thanks,
Tim.

Post request example.zip (10.2 KB)

2

Not sure why this happens with the POST node. But I just tried it with Palladian’s HTTP Retriever and there, all headers are properly sent. The configuration works somewhat differently, so here’s an example workflow with the setup:

https://nodepit.com/workflow/com.nodepit.space%2Fqqilihq%2Fpublic%2Fforum%2Fbug-report-post-request-tool-headers-not-sent-20941.knwf

– Philipp

1 Like
3

Hi qqilihq,

Unfortunately I can’t use the Palladian nodes for licensing reasons.

I should have mentioned that in my post.

Thanks for the quick response!

Tim.

4

I looked in to the logfile, and found that there is an exception happening:

2020-02-11 17:36:27,742 : WARN  : KNIME-Worker-9-GET Request 0:1 :  : RestNodeModel : GET 
Request : 0:1 : Call #1 failed: java.util.concurrent.ExecutionException: 
javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: SSLHandshakeException 
invoking https://[myURL]: sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to 
requested target

javax.ws.rs.ProcessingException: java.util.concurrent.ExecutionException: 
javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: SSLHandshakeException 
invoking https://[myURL]: sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to 
requested target

at org.knime.rest.nodes.common.RestNodeModel.invoke(RestNodeModel.java:485)

at org.knime.rest.nodes.common.RestNodeModel.makeFirstCall(RestNodeModel.java:371)

at org.knime.rest.nodes.common.RestNodeModel.execute(RestNodeModel.java:332)

at org.knime.core.node.NodeModel.execute(NodeModel.java:737)

at org.knime.core.node.NodeModel.executeModel(NodeModel.java:571)

at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1236)

at org.knime.core.node.Node.execute(Node.java:1016)

at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:557)

at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:95)

at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:218)

at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:124)

at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:334)

at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:210)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123)

at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246)
5

Hi Tim,

That’s a pity!

But just to be clear: The Palladian Nodes can be used in any environment. Only for running them on a KNIME Server you need a commercial license, for which we charge a very fair price (i.e. a fraction of what you pay for a KNIME server).

Anyways: I hope that someone will help you to get your POST issue fixed! And should you want to give the Palladian Nodes a try, feel free to get in touch with us: mail@palladian.ws

2 Likes
6

Thank you for the clarification - that makes a huge difference.
I’d misunderstood and thought that a commercial license was needed for any use in a commercial setting.
In that case my problem is solved, and I’ll use the Palladian nodes.
Thanks for the advice and for the tools.

Tim

1 Like
7

Happy to hear! :slight_smile:

8

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