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fix: require metadata for modern HTTP requests (#1089)

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This commit is contained in:
Dale Seo 2026-07-30 15:45:01 -04:00 • committed by GitHub
commit 58b136f44f
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1 changed files with 179 additions and 8 deletions
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22
crates/rmcp/src/transport/streamable_http_server/tower.rs
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@ -467,19 +467,27 @@ fn validate_request_protocol_version_meta(
return Ok(());
}
let is_discover = matches!(&request.request, ClientRequest::DiscoverRequest(_));
let Some(meta_version) = request.request.get_meta().protocol_version() else {
if is_discover {
let meta = request.request.get_meta();
let header_version = headers
.get(HEADER_MCP_PROTOCOL_VERSION)
.and_then(|value| value.to_str().ok());
let Some(meta_version) = meta.protocol_version() else {
let requires_request_metadata = is_discover
|| header_version
.is_some_and(|version| version >= ProtocolVersion::V_2026_07_28.as_str());
if requires_request_metadata {
let missing = meta.missing_required_keys(&ProtocolVersion::V_2026_07_28);
return Err(invalid_params_jsonrpc_response(
Some(request.id.clone()),
"Invalid params: server/discover requires protocolVersion in request _meta",
format!(
"Invalid params: request _meta is missing or has malformed required fields: {}",
missing.join(", ")
),
));
}
return Ok(());
};
let Some(header_version) = headers
.get(HEADER_MCP_PROTOCOL_VERSION)
.and_then(|value| value.to_str().ok())
else {
let Some(header_version) = header_version else {
return Err(header_mismatch_jsonrpc_response(
Some(request.id.clone()),
"request _meta protocolVersion requires MCP-Protocol-Version header",