fix(http): preserve CORS across OAuth routes - #3147
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Apply the browser CORS contract at the root router so authentication, metadata, error, and fallback responses retain the required headers. Register protected-resource metadata for every MCP route variant and verify each challenge round trip.\n\nRefs #3095\n\nCo-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Centralizes CORS handling for all HTTP routes and expands OAuth protected-resource discovery across every MCP route variant.
Changes:
- Apply CORS middleware at the root router.
- Add OAuth metadata routes for readonly, insiders, and toolset combinations.
- Expand contract tests and OAuth/CORS documentation.
Show a summary per file
| File | Description |
|---|---|
pkg/http/server.go |
Centralizes HTTP router construction and CORS handling. |
pkg/http/server_test.go |
Tests CORS and OAuth metadata route contracts. |
pkg/http/oauth/oauth.go |
Adds missing protected-resource route variants. |
pkg/http/oauth/oauth_test.go |
Verifies the complete metadata route matrix. |
pkg/http/middleware/cors.go |
Preserves existing exposed response headers. |
pkg/http/middleware/cors_test.go |
Tests preflight and exposed-header behavior. |
docs/streamable-http.md |
Documents OAuth discovery and browser proxy requirements. |
Review details
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- Review effort level: Balanced
Prevent unrecognized protected-resource metadata paths from falling through to the MCP root mount and producing recursive authentication challenges.\n\nRefs #3095\n\nCo-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
social4hyq
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Sep 20, 2026
github-mcp-server 1.11.0 Created-by: HarmonybrewBot Commit-by: HarmonybrewBot Merged-by: HarmonybrewBot Description: Created by `brew bump` --- Created with `brew bump-formula-pr`.<details> <summary>release notes</summary> <pre>## Highlights - **Smarter OAuth challenges:** per-call scope checks request only the permissions each tool invocation needs with runtime checks where required. - **Improved browser OAuth support:** CORS now works across OAuth discovery routes, with configurable authorization-server URLs. - **Improved sub-issue workflow:** create parent and sub-issues atomically. - **Better HTTP caching for STDIO:** REST responses support ETag conditional requests. - **Runtime refresh:** upgraded to Go 1.27authorizationauthorization plus routine security and dependency updates. ## What's Changed * feat(http): add --authorization-server flag to override OAuth AS URL by @Anika-Sol in github/github-mcp-server#2900 * Name the root command after the installed binary by @plusky in github/github-mcp-server#2998 * fix(http): preserve CORS across OAuth routes by @SamMorrowDrums in github/github-mcp-server#3147 * Add atomic parent issue creation by @zwick in github/github-mcp-server#3134 * Add ETag conditional requests to the REST transport by @joshfree in github/github-mcp-server#3026 * build(deps): bump github/codeql-action from 4 to 4.37.4 by @dependabot[bot] in github/github-mcp-server#3004 * Add per-call OAuth scope checks by @SamMorrowDrums in github/github-mcp-server#3128 * build(deps): bump docker/setup-buildx-action from 4.2.0 to 4.3.0 by @dependabot[bot] in github/github-mcp-server#3157 * build(deps): bump github.com/go-chi/chi/v5 from 5.3.1 to 5.3.2 by @dependabot[bot] in github/github-mcp-server#3156 * build(deps): bump distroless/base-debian12 from `76b3162` to `fabbf1c` by @dependabot[bot] in github/github-mcp-server#3154 * build(deps): bump golang from 1.25.13-alpine to 1.27.0-alpine by @dependabot[bot] in github/github-mcp-server#3153 * build(deps): bump github.com/stretchr/testify from 1.12.0 to 1.12.1 by @dependabot[bot] in github/github-mcp-server#3155 ## New Contributors * @Anika-Sol made their first contribution in github/github-mcp-server#2900 * @plusky made their first contribution in github/github-mcp-server#2998 * @joshfree made their first contribution in github/github-mcp-server#3026 **Full Changelog**: https://github.com/github/github-mcp-server/compare/v1.10.1...v1.11.0</pre> <p>View the full release notes at <a href="https://github.com/github/github-mcp-server/releases/tag/v1.11.0">https://github.com/github/github-mcp-server/releases/tag/v1.11.0</a>.</p> </details> <hr> See merge request: Harmonybrew/homebrew-core!17684
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Summary
WWW-AuthenticateandMcp-Session-Idwithout enabling credentialed wildcard requestsValidation
script/lintscript/testOrigin: https://confer.toHosted dependencies
Addresses the OSS server portion of #3095.