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Allow the end-to-end test's host under DNS rebinding protection #614

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Merged
koic merged 1 commit into from
Oct 15, 2026
Merged

Allow the end-to-end test's host under DNS rebinding protection #614

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9 changes: 8 additions & 1 deletion test/mcp/server/oauth/end_to_end_test.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,14 @@ def setup
WhoamiTool.observations.clear

@server = MCP::Server.new(name: "e2e_server", tools: [WhoamiTool])
@transport = Transports::StreamableHTTPTransport.new(@server, enable_json_response: true)
# The transport serves `mcp.example.com`, so the host is allow-listed as a deployment there would:
# DNS rebinding protection rejects any other `Host`, and WebMock 3.34 and later hand the Rack app
# the host of the request URL.
@transport = Transports::StreamableHTTPTransport.new(
@server,
enable_json_response: true,
allowed_hosts: [URI(MCP_URL).host],
)

@metadata = ProtectedResourceMetadata.new(
resource: MCP_URL,
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