Fix azure path parsing

[kylebarron]

Which issue does this PR close?

• Closes Incorrect prefix in ObjectStoreScheme::parse for Azure HTTP urls #398.

Rationale for this change

Is there a spec for each of these URL formats? In my usage of Azure so far it seems like Azure URLs like https://blob.core.windows.net/ always have the container as the first element of the URL path. Is that true?

Refer to the tests updated in this PR and ensure that you agree with the edited versions of them.

What changes are included in this PR?

Fixed parsing paths from Azure URLs.

Are there any user-facing changes?

Yes. Up to consideration whether this is a bug fix or a breaking change.

[kylebarron]

The failing emulator tests seem unrelated?

[alamb]

Here is a proposed fix for the emulator tests:

• Chore: fix emulator tests due to changes in reqwest #401

[alamb]

Thank you @kylebarron

This seems like it does what it is designed to do. I don't know much about azure

Is the path format documented anywhere that I can double check?

[kylebarron]

I also don't know the most about Azure; I've only started working with it recently.

I don't know where these URL patterns are documented; it's just my understanding that the first part of the path is the container name.

[alamb]

Thanks @kylebarron

[kylebarron]

Is the path format documented anywhere that I can double check?

Looks like here? https://learn.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-containers--blobs--and-metadata#resource-uri-syntax

Each resource has a corresponding base URI, which refers to the resource itself.

For the storage account, the base URI includes the name of the account only:

https://myaccount.blob.core.windows.net

For a container, the base URI includes the name of the account and the name of the container:

https://myaccount.blob.core.windows.net/mycontainer

For a blob, the base URI includes the name of the account, the name of the container, and the name of the blob:

https://myaccount.blob.core.windows.net/mycontainer/myblob

There is also a section about a root container that I'm not familiar with.

[alamb]

Thanks again @kylebarron