{"record":{"id":"47a4bffe0bde4263","repo":"nats-io/nats-server","slug":"processleafmsgargs-parse-error-s","errorCode":null,"errorMessage":"processLeafMsgArgs Parse Error: '%s'","messagePattern":"processLeafMsgArgs Parse Error: '(.+?)'","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/leafnode.go","lineNumber":3255,"sourceCode":"\t\tcase ' ', '\\t', '\\r', '\\n':\n\t\t\tif start >= 0 {\n\t\t\t\targs = append(args, arg[start:i])\n\t\t\t\tstart = -1\n\t\t\t}\n\t\tdefault:\n\t\t\tif start < 0 {\n\t\t\t\tstart = i\n\t\t\t}\n\t\t}\n\t}\n\tif start >= 0 {\n\t\targs = append(args, arg[start:])\n\t}\n\n\tc.pa.arg = arg\n\tswitch len(args) {\n\tcase 0, 1:\n\t\treturn fmt.Errorf(\"processLeafMsgArgs Parse Error: '%s'\", args)\n\tcase 2:\n\t\tc.pa.reply = nil\n\t\tc.pa.queues = nil\n\t\tc.pa.szb = args[1]\n\t\tc.pa.size = parseSize(args[1])\n\tcase 3:\n\t\tc.pa.reply = args[1]\n\t\tc.pa.queues = nil\n\t\tc.pa.szb = args[2]\n\t\tc.pa.size = parseSize(args[2])\n\tdefault:\n\t\t// args[1] is our reply indicator. Should be + or | normally.\n\t\tif len(args[1]) != 1 {\n\t\t\treturn fmt.Errorf(\"processLeafMsgArgs Bad or Missing Reply Indicator: '%s'\", args[1])\n\t\t}\n\t\tswitch args[1][0] {\n\t\tcase '+':\n\t\t\tc.pa.reply = args[2]","sourceCodeStart":3237,"sourceCodeEnd":3273,"githubUrl":"https://github.com/nats-io/nats-server/blob/3a66a489d262bf89b71a71c955c94920394532f3/server/leafnode.go#L3237-L3273","documentation":"Leaf-node protocol parse guard: a non-header message line split into 0 or 1 argument tokens, too few to carry subject plus size (and optional reply), so the message cannot be parsed.","triggerScenarios":"Thrown at server/leafnode.go:3255 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Verify protocol compatibility across leaf peers","Check for connection corruption or protocol-mangling proxies","Enable trace logging to capture the malformed line"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3a66a489d262bf89b71a71c955c94920394532f3","analyzedAt":"2026-09-02T04:41:54.247Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}