Fix MCP endpoint with redirect HTTPS

[JamesNK]

Description

Fix dashboard configuration error when MCP endpoint is the only non-HTTPS endpoint.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue (consider using one of the following templates):
      • New (or update) doc-idea template
      • New breaking-change template
      • New diagnostic template
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 12556

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12556"

[Copilot]

Pull Request Overview

This PR adds support for MCP (Model Context Protocol) endpoint to work with HTTP-only configuration, ensuring that HTTPS redirection is only enabled when all endpoints (Frontend, OTLP gRPC, OTLP HTTP, and MCP) are using HTTPS.

Key changes:

• Updated the isAllHttps check to include the MCP endpoint when determining whether to enable HTTPS redirection
• Added a test to verify that the MCP endpoint works correctly when configured with HTTP while other endpoints use HTTPS
• Introduced a local variable to improve code readability when iterating over grouped endpoints

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Aspire.Dashboard/DashboardWebApplication.cs	Added MCP endpoint to the HTTPS check and extracted grouped endpoints to a local variable
tests/Aspire.Dashboard.Tests/Integration/McpServiceTests.cs	Added test case to verify MCP endpoint works with HTTP-only configuration

[JamesNK]

/backport to release/13.0

[github-actions]

Started backporting to release/13.0: https://github.com/dotnet/aspire/actions/runs/18969710303