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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@
import com.fasterxml.jackson.databind.ObjectMapper;

import io.modelcontextprotocol.client.transport.ResponseSubscribers.ResponseEvent;
import io.modelcontextprotocol.spec.HttpHeaders;
import io.modelcontextprotocol.spec.McpClientTransport;
import io.modelcontextprotocol.spec.McpSchema;
import io.modelcontextprotocol.spec.ProtocolVersions;
Expand Down Expand Up @@ -66,8 +67,6 @@ public class HttpClientSseClientTransport implements McpClientTransport {

private static final String MCP_PROTOCOL_VERSION = ProtocolVersions.MCP_2024_11_05;

private static final String MCP_PROTOCOL_VERSION_HEADER_NAME = "MCP-Protocol-Version";

private static final Logger logger = LoggerFactory.getLogger(HttpClientSseClientTransport.class);

/** SSE event type for JSON-RPC messages */
Expand Down Expand Up @@ -403,7 +402,7 @@ public Mono<Void> connect(Function<Mono<JSONRPCMessage>, Mono<JSONRPCMessage>> h
.uri(uri)
.header("Accept", "text/event-stream")
.header("Cache-Control", "no-cache")
.header(MCP_PROTOCOL_VERSION_HEADER_NAME, MCP_PROTOCOL_VERSION)
.header(HttpHeaders.PROTOCOL_VERSION, MCP_PROTOCOL_VERSION)
.GET();
return Mono.from(this.httpRequestCustomizer.customize(builder, "GET", uri, null));
}).flatMap(requestBuilder -> Mono.create(sink -> {
Expand Down Expand Up @@ -529,7 +528,7 @@ private Mono<HttpResponse<String>> sendHttpPost(final String endpoint, final Str
return Mono.defer(() -> {
var builder = this.requestBuilder.copy()
.uri(requestUri)
.header(MCP_PROTOCOL_VERSION_HEADER_NAME, MCP_PROTOCOL_VERSION)
.header(HttpHeaders.PROTOCOL_VERSION, MCP_PROTOCOL_VERSION)
.POST(HttpRequest.BodyPublishers.ofString(body));
return Mono.from(this.httpRequestCustomizer.customize(builder, "POST", requestUri, body));
}).flatMap(customizedBuilder -> {
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -435,8 +435,10 @@ public Mono<Void> sendMessage(McpSchema.JSONRPCMessage sentMessage) {
})).onErrorMap(CompletionException.class, t -> t.getCause()).onErrorComplete().subscribe();

})).flatMap(responseEvent -> {
if (transportSession.markInitialized(
responseEvent.responseInfo().headers().firstValue("mcp-session-id").orElseGet(() -> null))) {
if (transportSession.markInitialized(responseEvent.responseInfo()
.headers()
.firstValue(HttpHeaders.MCP_SESSION_ID)
.orElseGet(() -> null))) {
// Once we have a session, we try to open an async stream for
// the server to send notifications and requests out-of-band.

Expand Down