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I understand I can do something like :
```url = Output.all([server.username, server.password]).apply(lambda l: f"http://{l[0]}:{l[1]}/")```
But Is there a way to dump the whole server object and its fields?

You should be able to print the object inside the apply. Something along the lines of
```url = server_object.apply(lambda l: pprint(vars(l)))```

Alternatively, you can view the state of your resources through the pulumi SaaS, or with `pulumi stack export`

AttributeError: 'Instance' object has no attribute 'apply'
  error: an unhandled error occurred: Program exited with non-zero exit code: 1

may be i will pulumi.export("SERVER", server_object) and see it at the end ?

Ah, in that case, you need to wrap the object in an output before running apply:
`pulumi.Output(server_object).apply(...)`

It may not work during preview, as some of the values may not have been resolved yet. The export should also work.

<https://www.pulumi.com/docs/intro/concepts/programming-model/#outputs>