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Add CORS middleware to Starlette app for frontend support #1201

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Introduces CORS middleware to the Starlette app instances in FastMCP to allow requests from local web frontends. This enables compatibility with web clients running on localhost and related origins, supporting credentials and common HTTP methods and headers.

Motivation and Context

Fixes #187 (comment)

How Has This Been Tested?

Breaking Changes

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

Introduces CORS middleware to the Starlette app instances in FastMCP to allow requests from local web frontends. This enables compatibility with web clients running on localhost and related origins, supporting credentials and common HTTP methods and headers.
@SmartManoj SmartManoj requested a review from a team as a code owner July 26, 2025 12:27
@SmartManoj SmartManoj requested a review from dsp-ant July 26, 2025 12:27
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Better CORS defaults for SSE transport
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