René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unable to call tools with Chinese names using HttpClientSseClientTransport and HttpClientStreamableHttpTransport","articleBody":"\n\n**Bug description**\nWhen I call the tool which name  is Chinese,  The mcp client will throws Exception below.\n```\nException in thread \"main\" io.modelcontextprotocol.spec.McpError: Tool not found: 天气预报\n\tat io.modelcontextprotocol.spec.McpClientSession.lambda$sendRequest$11(McpClientSession.java:248)\n\tSuppressed: The stacktrace has been enhanced by Reactor, refer to additional information below:\n```\nThe tool name is messy code. \n\n\n**Environment**\nSpring AI 1.0.0    ,   mcp 0.10.0  ,  without vector store\n\n**Java SDK**\nOpenjdk17\n\n**Steps to reproduce**\nJust add a tool with a Chinese name(such as  天气预报),  then call the tool.\n\n**Recommendation**\n**sendMessage in HttpClientSseClientTransport.java** \n```\nString jsonText = this.objectMapper.writeValueAsString(message);\n\t\t\tURI requestUri = Utils.resolveUri(baseUri, endpoint);\n\t\t\tHttpRequest request = this.requestBuilder.uri(requestUri)\n\t\t\t\t.setHeader(\"Content-Type\", \"application/json;charset=UTF-8\")\n\t\t\t\t.POST(HttpRequest.BodyPublishers.ofString(jsonText))\n\t\t\t\t.build();\n```\n\nSo just set the default request encoding of HttpRequest in the HttpClientSseClientTransport  to UTF-8.\n","author":{"url":"https://github.com/pcalpha","@type":"Person","name":"pcalpha"},"datePublished":"2025-05-23T08:37:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/260/java-sdk/issues/260"}