fix(client): use StreamableHTTPError instead of plain Error in send() #1178
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Use StreamableHTTPError instead of plain Error when throwing HTTP errors in the send() method. This allows clients to programmatically access the HTTP status code via error.code, which is required for implementing proper SSE fallback behavior per MCP spec (only fallback for 400/404/405). Fixes modelcontextprotocol#1176
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felixweinberger
approved these changes
Nov 28, 2025
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Use
StreamableHTTPErrorinstead of plainErrorinsend()method to expose HTTP status code viaerror.code.Fixes: #1176