Allow use of app behind a proxy

[nikku]

What should we do?

We want to investigate if and how we can use the app to work from behind a proxy.

• Extend Zeebe Connection Test to support a proxy setup
• Verify that the modeler works through a proxy

Why should we do it?

Related to https://jira.camunda.com/browse/SUPPORT-22708

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Cf. Electron proxy documentation

[nikku]

Looking to potentially prioritize this next iteration.

[wanddynosios]

@nikku Cloud you please elaborate what this issue is exactly for?

We are currently deploying c8 via the helm-chart to an air-gapped k8s cluster. After configuring a proxy and no_proxy for the webapp (to access the internet marketplace) as mentioned here, we are experiencing routing loops. For some reason, the requests against the keycloak are routed through the proxy, despite being included in the no_proxy.

I this issue connected, or should we open a new one?
@asys3

[nikku]

I'm pretty sure this is connected. What we've found is that customers, with certain proxy configurations were not able to reach the remote end, though we did not find a way to reproduce this ourselves. Hence we created this issue to develop a test bed.

However this issue specifically targets the Desktop Modeler. Similar issues may exist for Web Modeler, of course.