e5d3b2c135
## Summary When using browser-based MCP clients such as MCP Inspector, connections to the example HTTP server failed due to two issues: 1. CORS preflight (OPTIONS) requests returned 405 Method Not Allowed, causing browsers to block all cross-origin requests. 2. `Accept: */*` (commonly sent by browsers and fetch API) returned 406 Not Acceptable because the transport required the Accept header to explicitly list `application/json` and `text/event-stream`. Add `rack-cors` middleware to the example HTTP servers so that preflight requests are handled correctly and `Mcp-Session-Id` is exposed to browser clients. Also fix `validate_accept_header` in `StreamableHTTPTransport` to treat `*/*` as satisfying all required Accept types. Fixes #141. ## Repro Steps ### 1. Start the example server (Terminal 1) ```console $ bundle exec ruby examples/streamable_http_server.rb ``` ### 2. Start MCP Inspector (Terminal 2) ```console $ npx @modelcontextprotocol/inspector ``` ### 3. Open the Inspector Web UI (http://localhost:6274) in a browser - Set Transport Type to "Streamable HTTP" - Set URL to http://localhost:9393 - Disable the Authorization header toggle (the example server does not require authentication) - Click "Connect" Before this change, the connection fails due to CORS or 406 errors. After this change, the connection succeeds and tools are listed. These steps have been added to examples/README.md.
30 lines
747 B
Ruby
30 lines
747 B
Ruby
# frozen_string_literal: true
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source "https://rubygems.org"
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# Specify runtime dependencies in the gemspec
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gemspec
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# Specify development dependencies below
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gem "rubocop-minitest", require: false
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gem "rubocop-rake", require: false
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gem "rubocop-shopify", ">= 2.18", require: false if RUBY_VERSION >= "3.1"
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gem "puma", ">= 5.0.0"
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gem "rack-cors"
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gem "rackup", ">= 2.1.0"
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gem "activesupport"
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# Fix io-console install error when Ruby 3.0.
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gem "debug" if RUBY_VERSION >= "3.1"
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gem "rake", "~> 13.0"
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gem "sorbet-static-and-runtime" if RUBY_VERSION >= "3.0"
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gem "yard", "~> 0.9"
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gem "yard-sorbet", "~> 0.9" if RUBY_VERSION >= "3.1"
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group :test do
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gem "faraday", ">= 2.0"
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gem "minitest", "~> 5.1", require: false
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gem "mocha"
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gem "webmock"
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end
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