ConnectGetNamespacedPodExec fails with 'Upgrade Required'

[tingweiwu]

I'm trying to use the Java client to execute a command in a container in a pod.

coreV1Api.connectGetNamespacedPodExec(name, namespace, command, name, true, false, true, false);

The server returns ApiException as following:

{"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"Upgrade request required","reason":"BadRequest","code":400}

could anyone help?

[tingweiwu]

I saw the python client issue kubernetes-client/python#58
it is related with the fact that requests is not SPDY compatible.

[karthikkondapally]

@tingweiwu
there is an example of how to use Exec of the jar
https://github.com/kubernetes-client/java/blob/master/examples/src/main/java/io/kubernetes/client/examples/ExecExample.java

[brendandburns]

Closing this since that example is correct. One thing to note is that if you have a proxy in the way, you need to make sure that it preserves the Host header.

[ekovacs]

basically the java-client will be scattered with broken methods like this, if such bug reports are closed :-/

[brendandburns]

The problem is that the methods are documented in Swagger/OpenAPI, so the code generator blindly generates them.

But the actual protocol used for implementing the methods (WebSockets) is something that the code generator doesn't support.

In theory we could modify the code gen project (https://github.com/kubernetes-client/gen) to strip those methods out of the Swagger before we generate the code, but it seems like a lot of work for minimal pay-off.

That said, if someone wants to take this on as a project, I'd gladly merge the PR. But it needs to be a change to https://github.com/kubernetes-client/gen, not this repo.

[marceloFA]

The problem is that the methods are documented in Swagger/OpenAPI, so the code generator blindly generates them.

But the actual protocol used for implementing the methods (WebSockets) is something that the code generator doesn't support.

In theory we could modify the code gen project (https://github.com/kubernetes-client/gen) to strip those methods out of the Swagger before we generate the code, but it seems like a lot of work for minimal pay-off.

That said, if someone wants to take this on as a project, I'd gladly merge the PR. But it needs to be a change to https://github.com/kubernetes-client/gen, not this repo.

Does this mean that the method ConnectGetNamespacedPodExec is in fact unusable?