Application Gateway support for Get Server Variables APIs

[nirkum18]

Is your feature request related to a problem? Please describe.
CLI needs to be updated according to the NRP and swagger changes. We have added 3 new APIs to fetch the supported server variables, request and response headers, for Header CRUD feature in Application Gateway. CLI needs to be updated to support these APIs.

Describe the solution you'd like
Need CLI to be written as per the Swagger Changes here.

[tjprescott]

API version 2018-11-01.

[tjprescott]

@nirkum18 I believe there is something wrong with the Swagger specs for these three endpoints. Whenever I try to call them using the Autorest generated SDK, I get the following error:

  File "d:\gitrepos\github\env\lib\site-packages\azure\mgmt\network\v2018_12_01\operations\application_gateways_operations.py", line 955, in list_available_response_headers
    deserialized = models.list(internal_paging, self._deserialize.dependencies)
AttributeError: module 'azure.mgmt.network.v2018_12_01.models' has no attribute 'list'

cc/ @lmazuel

[tjprescott]

I will proceed with my PR to bump the Network API version, but I will not add these commands until the specs are fixed.

[nirkum18]

@nirkum18 I believe there is something wrong with the Swagger specs for these three endpoints. Whenever I try to call them using the Autorest generated SDK, I get the following error:

  File "d:\gitrepos\github\env\lib\site-packages\azure\mgmt\network\v2018_12_01\operations\application_gateways_operations.py", line 955, in list_available_response_headers
    deserialized = models.list(internal_paging, self._deserialize.dependencies)
AttributeError: module 'azure.mgmt.network.v2018_12_01.models' has no attribute 'list'

cc/ @lmazuel

Sorry for the delayed reply. I was OOF in the past week.

@tjprescott Some recent swagger changes related to these changes were pushed to the network-january-release branch. If you the SDK, that you are using, is getting generated from network-december-release branch, it may not contain the recently checkedin changes.

I have generated the SDK with those changes and powershell cmdlets are working fine for me.
Here is the swagger PR link: Azure/azure-rest-api-specs#5113

In this PR we changed the return type of commandlets from a dictionary to a list of strings.

[tjprescott]

Thanks for the update @nirkum18. When those changes are merged to master, we will be able to proceed.

[tjprescott]

@nirkum18 it seems the network-january-release branch has still not been merged to master? Do you know when this will happen?

[tjprescott]

Due to the necessity for Swagger changes, there is no way this will be released this sprint. @nirkum18 please advise when the Swagger fix has been merged and we will reschedule this work accordingly.

[tjprescott]

Swagger issues have been resolved, so this change will go into Sprint 58.