René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SSE Server drops client connection at 5 min.","articleBody":"**Bug description**\nI developed a MCP server with webmvc SSE endpoint but when a client connects via /sse endpoint, after appx 5 min later server drops connection. This is happen because Client-side needs from server-side to ping itself. Current release doesnt support this and \n\n**Environment**\nJDK:17\nSpring Boot: 3.5.3\nSpring AI: 1.0.0\n\n**Steps to reproduce**\nYou can reproduce this bug on any setup. I try with Spring example with webmvc [https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/weather/starter-webmvc-server](url) You can start this app and just connect it with cursor or vscode and then 5min later client will got an error.\n\nClient-side servername: LOCAL-SERVER,\n    \"LOCAL-SERVER\": {\n      \"url\": \"http://localhost:8080/sse\"\n    }\n\n2025-07-18 21:18:05.422 [info] user-LOCAL-SERVER: Handling CreateClient action\n2025-07-18 21:18:05.422 [info] user-LOCAL-SERVER: Creating streamableHttp transport\n2025-07-18 21:18:05.422 [info] user-LOCAL-SERVER: Connecting to streamableHttp server\n2025-07-18 21:18:05.432 [error] user-LOCAL-SERVER: Client error for command Error POSTing to endpoint (HTTP 404): {\"timestamp\":\"2025-07-18T18:18:05.431+00:00\",\"status\":404,\"error\":\"Not Found\",\"path\":\"/sse\"}\n2025-07-18 21:18:05.433 [info] user-LOCAL-SERVER: Client closed for command\n2025-07-18 21:18:05.433 [error] user-LOCAL-SERVER: Error connecting to streamableHttp server, falling back to SSE: Error POSTing to endpoint (HTTP 404): {\"timestamp\":\"2025-07-18T18:18:05.431+00:00\",\"status\":404,\"error\":\"Not Found\",\"path\":\"/sse\"}\n2025-07-18 21:18:05.433 [error] user-LOCAL-SERVER: Error connecting to streamableHttp server, falling back to SSE: Error POSTing to endpoint (HTTP 404): {\"timestamp\":\"2025-07-18T18:18:05.431+00:00\",\"status\":404,\"error\":\"Not Found\",\"path\":\"/sse\"}\n2025-07-18 21:18:05.433 [info] user-LOCAL-SERVER: Connecting to SSE server\n2025-07-18 21:18:05.448 [info] user-LOCAL-SERVER: Successfully connected to streamableHttp server\n2025-07-18 21:18:05.448 [info] user-LOCAL-SERVER: Storing streamableHttp client\n2025-07-18 21:18:05.449 [info] user-LOCAL-SERVER: Handling ListOfferings action\n2025-07-18 21:18:05.449 [info] user-LOCAL-SERVER: Listing offerings\n2025-07-18 21:18:05.449 [info] user-LOCAL-SERVER: Connected to streamableHttp server, fetching offerings\n2025-07-18 21:18:05.452 [info] listOfferings: Found 3 tools\n2025-07-18 21:18:05.452 [info] user-LOCAL-SERVER: Found 3 tools\n2025-07-18 21:23:09.107 [error] user-LOCAL-SERVER: Client error for command SSE error: TypeError: terminated: Body Timeout Error\n\n**Expected behavior**\nYou can add periodic ping option to keep alive for each client connection. (time)\n\n\nSame issue: [https://github.com/modelcontextprotocol/typescript-sdk/issues/270](url)\n","author":{"url":"https://github.com/albayrakonur","@type":"Person","name":"albayrakonur"},"datePublished":"2025-07-18T18:26:58.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/414/java-sdk/issues/414"}