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Title: Streamable HTTP - SSE Failure Logging / Handling · Issue #877 · modelcontextprotocol/java-sdk · GitHub

Open Graph Title: Streamable HTTP - SSE Failure Logging / Handling · Issue #877 · modelcontextprotocol/java-sdk

X Title: Streamable HTTP - SSE Failure Logging / Handling · Issue #877 · modelcontextprotocol/java-sdk

Description: Version 1.1.0 I'm connecting to the https://www.javadocs.dev/mcp server - streamable http, but no SSE support. I get this on Spring app startup: 2026-03-19T21:33:47.310-06:00 INFO 114327 --- [ient-1-Worker-0] i.m.client.LifecycleInitiali...

Open Graph Description: Version 1.1.0 I'm connecting to the https://www.javadocs.dev/mcp server - streamable http, but no SSE support. I get this on Spring app startup: 2026-03-19T21:33:47.310-06:00 INFO 114327 --- [ient-...

X Description: Version 1.1.0 I'm connecting to the https://www.javadocs.dev/mcp server - streamable http, but no SSE support. I get this on Spring app startup: 2026-03-19T21:33:47.310-06:00 INFO 114327 --- [i...

Opengraph URL: https://github.com/modelcontextprotocol/java-sdk/issues/877

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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Streamable HTTP - SSE Failure Logging / Handling","articleBody":"Version 1.1.0\n\nI'm connecting to the https://www.javadocs.dev/mcp server - streamable http, but no SSE support. I get this on Spring app startup:\n\n```\n2026-03-19T21:33:47.310-06:00  INFO 114327 --- [ient-1-Worker-0] i.m.client.LifecycleInitializer          : Server response with Protocol: 2025-03-26, Capabilities: ServerCapabilities[completions=null, experimental=null, logging=null, prompts=null, resources=null, tools=ToolCapabilities[listChanged=false]], Info: Implementation[name=javadocs.dev, title=null, version=0.0.2] and Instructions null\n2026-03-19T21:33:47.318-06:00  WARN 114327 --- [ient-1-Worker-0] i.m.client.LifecycleInitializer          : Handling exception\n\nio.modelcontextprotocol.spec.McpTransportException: Unrecognized server error when connecting to SSE stream, status code: 404\n\tat io.modelcontextprotocol.client.transport.HttpClientStreamableHttpTransport.lambda$reconnect$11(HttpClientStreamableHttpTransport.java:303) ~[mcp-core-1.1.0.jar:1.1.0]\n\tat reactor.core.publisher.FluxFlatMap$FlatMapMain.onNext(FluxFlatMap.java:389) ~[reactor-core-3.8.4.jar:3.8.4]\n\tat reactor.core.publisher.FluxCreate$BufferAsyncSink.drain(FluxCreate.java:887) ~[reactor-core-3.8.4.jar:3.8.4]\n\tat reactor.core.publisher.FluxCreate$BufferAsyncSink.next(FluxCreate.java:812) ~[reactor-core-3.8.4.jar:3.8.4]\n\tat reactor.core.publisher.FluxCreate$SerializedFluxSink.next(FluxCreate.java:164) ~[reactor-core-3.8.4.jar:3.8.4]\n\tat io.modelcontextprotocol.client.transport.ResponseSubscribers$BodilessResponseLineSubscriber.hookOnComplete(ResponseSubscribers.java:315) ~[mcp-core-1.1.0.jar:1.1.0]\n\tat reactor.core.publisher.BaseSubscriber.onComplete(BaseSubscriber.java:200) ~[reactor-core-3.8.4.jar:3.8.4]\n\tat org.reactivestreams.FlowAdapters$FlowToReactiveSubscriber.onComplete(FlowAdapters.java:221) ~[reactive-streams-1.0.4.jar:na]\n\tat java.net.http/jdk.internal.net.http.LineSubscriberAdapter$LineSubscription.loop(LineSubscriberAdapter.java:430) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:280) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:233) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.LineSubscriberAdapter$LineSubscription.signalComplete(LineSubscriberAdapter.java:193) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.LineSubscriberAdapter.onComplete(LineSubscriberAdapter.java:114) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.HttpBodySubscriberWrapper.complete(HttpBodySubscriberWrapper.java:293) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.HttpBodySubscriberWrapper.onComplete(HttpBodySubscriberWrapper.java:401) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Stream.schedule(Stream.java:230) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:280) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:233) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Stream.receiveDataFrame(Stream.java:427) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Stream.incoming(Stream.java:566) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection.processFrame(Http2Connection.java:1070) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.frame.FramesDecoder.decode(FramesDecoder.java:155) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection$FramesController.processReceivedData(Http2Connection.java:318) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection.asyncReceive(Http2Connection.java:871) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection$Http2TubeSubscriber.processQueue(Http2Connection.java:1840) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:280) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:233) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection$Http2TubeSubscriber.runOrSchedule(Http2Connection.java:1857) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection$Http2TubeSubscriber.onNext(Http2Connection.java:1884) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.Http2Connection$Http2TubeSubscriber.onNext(Http2Connection.java:1818) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SSLTube$DelegateWrapper.onNext(SSLTube.java:219) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SSLTube$SSLSubscriberWrapper.onNext(SSLTube.java:499) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SSLTube$SSLSubscriberWrapper.onNext(SSLTube.java:304) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SubscriberWrapper$DownstreamPusher.run1(SubscriberWrapper.java:316) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SubscriberWrapper$DownstreamPusher.run(SubscriberWrapper.java:259) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:280) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:233) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SubscriberWrapper.outgoing(SubscriberWrapper.java:232) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SubscriberWrapper.outgoing(SubscriberWrapper.java:198) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SSLFlowDelegate$Reader.processData(SSLFlowDelegate.java:465) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SSLFlowDelegate$Reader$ReaderDownstreamPusher.run(SSLFlowDelegate.java:283) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(SequentialScheduler.java:182) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:149) ~[java.net.http:na]\n\tat java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:207) ~[java.net.http:na]\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090) ~[na:na]\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614) ~[na:na]\n\tat java.base/java.lang.Thread.run(Thread.java:1474) ~[na:na]\n```\n\nEverything works correctly. The MCP spec does say that the GET to /mcp can return a 405 response, which I tried but still got a similar logged error.","author":{"url":"https://github.com/jamesward","@type":"Person","name":"jamesward"},"datePublished":"2026-03-20T15:59:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/877/java-sdk/issues/877"}
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