.Net: Bug: VertexAI global Endpoint not working

[schmitch]

Describe the bug
Currently we try to use the global endpoint with SemanticKernel with VertexAI.
However it looks like that is not possible because the uri is different.

the global endpoint looks like that:

$"https://aiplatform.googleapis.com/{versionSubLink}/projects/{projectId}/locations/{location}/publishers/google/models/{this._modelId}:...

however the regional endpoints that this project uses are like that:

$"https://{location}-aiplatform.googleapis.com/{versionSubLink}/projects/{projectId}/locations/{location}/publishers/google/models/{this._modelId}:

the fix is probably easy by just "hardcoding" that if the location is global, that the base domain is different.

Platform

• Language: C#
• AI model: VertexAI

Original Issue: #12525

[Joshualover]

Great bug report! 👍

This is a very clear explanation of the issue with VertexAI global endpoints.

Quick suggestion:

You could try using environment variables to make the fix more flexible:

var baseUri = _config.GlobalEndpointEnabled
    ? $"https://aiplatform.googleapis.com/{versionSubLink}/..."
    : $"https://{location}-aiplatform.googleapis.com/{versionSubLink}/...";

This way, users can control whether to use global or regional endpoints via configuration.

Would be happy to help test or provide more suggestions if needed!

[schmitch]

Great bug report! 👍

This is a very clear explanation of the issue with VertexAI global endpoints.

Quick suggestion:

You could try using environment variables to make the fix more flexible:

var baseUri = _config.GlobalEndpointEnabled
? $"https://aiplatform.googleapis.com/{versionSubLink}/..."
: $"https://{location}-aiplatform.googleapis.com/{versionSubLink}/...";

This way, users can control whether to use global or regional endpoints via configuration.

Would be happy to help test or provide more suggestions if needed!

actually there is no config to give and I would say that adding a config here makes no sense because the user will set the location anyway which than actually decides the correct endpoint? would be a little bit stupid if I need to set:

location: "global", config: new Config { GlobalEndpointEnabled = true }

?