Source note · Model Context Protocol transports compared
MCP revision 2026-07-28 removed SSE stream resumability and message redelivery (the Last-Event-ID header and SSE event IDs) from Streamable HTTP; a broken response stream loses the in-flight request and clients MUST re-issue it as a new request with a new request ID.
Checked 2026-09-30
- Vendor
- Model Context Protocol project
- Product
- MCP specification
- Subsystem
- Streamable HTTP transport
- Deployment
- remote-http
- Region
- not restricted
- Release range
- MCP revision 2026-07-28
- Checked
- 2026-09-30
Sources
- Model Context Protocol specification 2026-07-28, Key Changes — Model Context Protocol project · tier 1 standards and regulators · section Major changes, item 9
Cite this note
APA
WarmTransfer. (2026, September 30). Model Context Protocol transports compared: source note mcp-transport-differences-http-no-resumability. WarmTransfer. https://warmtransfer.net/knowledge/claims/mcp-transport-differences-http-no-resumability
BibTeX
@misc{warmtransfer-claim-mcp-transport-differences-http-no-resumability,
title = {Model Context Protocol transports compared: source note mcp-transport-differences-http-no-resumability},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/mcp-transport-differences-http-no-resumability},
note = {Source note mcp-transport-differences-http-no-resumability, checked 2026-09-30}
}