Parse SSE responses in HTTP client via event_stream_parser

The Streamable HTTP spec allows servers to respond with either
`application/json` or `text/event-stream`. The client previously
rejected the latter. Add SSE parsing via the optional
`event_stream_parser` gem (users add it to their Gemfile when their
server uses SSE), dispatch on the response Content-Type, and scan the
event stream for the first JSON-RPC response message.

Document the new optional dependency in both the README's HTTP
Transport Layer section and docs/building-clients.md.

No other Streamable HTTP features (202 handling, session IDs,
`connect`, DELETE termination) are included here; those will land in
follow-up PRs.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Ates Goral 2026-04-19 11:54:03 -04:00
commit b832933f9f

View file

@ -51,11 +51,12 @@ stdio_transport.close
## HTTP Transport
Use `MCP::Client::HTTP` to interact with MCP servers over HTTP. Requires the `faraday` gem:
Use `MCP::Client::HTTP` to interact with MCP servers over HTTP. Requires the `faraday` gem, plus `event_stream_parser` if the server uses SSE (`text/event-stream`) responses:
```ruby
gem 'mcp'
gem 'faraday', '>= 2.0'
gem 'event_stream_parser', '>= 1.0' # optional, required only for SSE responses
```
```ruby