Fix api url for Github Enterprise

[v2kiran]

The api url has been coded in the following format:

$url = "https://api.$hostName/$UriFragment"

While this works for github it fails with the enterprise version because the api url is different:

http(s)://[hostname]/api/v3

As a result when you call any of the function referencing Github enterprise you may get the following error:

The remote name could not be resolved: 'api.myghhost.com'
At C:\Program 
Files\WindowsPowerShell\Modules\PowerShellForGitHub\0.8.0\GitHubCore.ps1:520 
char:9
+         throw $newLineOutput
+         ~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OperationStopped: (The remote name.... 
   com':String) [], RuntimeException
    + FullyQualifiedErrorId : The remote name could not be resolved: 'api.myghhost.com'

Will raise a PR to fix this.

[HowardWolosky]

That sounds like a dupe of #101 (and the documentation for that feature can be found here. Please re-activate with more details if I've misunderstood.

[HowardWolosky]

Actually, after you saying that not all enterprise installations have the API available at api. <hostname>?

[v2kiran]

hmm I thought all Github enterprise instances had a different api url than the public github.com. This has been the case in my current setup as well as the last place I worked.

Are you saying that there are some github enterprise instances that are accessible at : api.ghhost?

https://developer.github.com/enterprise/2.16/v3/#current-version

[HowardWolosky]

That was the case for @Cellivar who implemented #101... Reading the docs, it appears not to be the required case. Re-opening this issue. Feel free to provide a PR.

[Cellivar]

To my knowledge both API endpoints work with a strong preference from GitHub support for the api.(domain) endpoint. We have seen integrations using either one to no ill effect.

If your deployment doesn't expose api.(domain) that's usually a sign of a configuration issue. You can confirm the subdomain isolation configuration settings in the management console. https://help.github.com/enterprise/2.1/admin/articles/configuring-dns-ssl-and-subdomain-settings