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fix: Handle non-compliant notification responses #589

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Merged
merged 1 commit into from
Oct 1, 2025
+6 −4
Merged

fix: Handle non-compliant notification responses #589

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5 changes: 3 additions & 2 deletions ...main/java/io/modelcontextprotocol/client/transport/HttpClientStreamableHttpTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -507,8 +507,9 @@ else if (contentType.contains(TEXT_EVENT_STREAM)) {
else if (contentType.contains(APPLICATION_JSON)) {
deliveredSink.success();
String data = ((ResponseSubscribers.AggregateResponseEvent) responseEvent).data();
if (sentMessage instanceof McpSchema.JSONRPCNotification && Utils.hasText(data)) {
logger.warn("Notification: {} received non-compliant response: {}", sentMessage, data);
if (sentMessage instanceof McpSchema.JSONRPCNotification) {
logger.warn("Notification: {} received non-compliant response: {}", sentMessage,
Utils.hasText(data) ? data : "[empty]");
return Mono.empty();
}

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5 changes: 3 additions & 2 deletions .../main/java/io/modelcontextprotocol/client/transport/WebClientStreamableHttpTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -423,8 +423,9 @@ private Flux<McpSchema.JSONRPCMessage> directResponseFlux(McpSchema.JSONRPCMessa
ClientResponse response) {
return response.bodyToMono(String.class).<Iterable<McpSchema.JSONRPCMessage>>handle((responseMessage, s) -> {
try {
if (sentMessage instanceof McpSchema.JSONRPCNotification && Utils.hasText(responseMessage)) {
logger.warn("Notification: {} received non-compliant response: {}", sentMessage, responseMessage);
if (sentMessage instanceof McpSchema.JSONRPCNotification) {
logger.warn("Notification: {} received non-compliant response: {}", sentMessage,
Utils.hasText(responseMessage) ? responseMessage : "[empty]");
s.complete();
}
else {
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