{"record":{"id":"7389bd12253cf4f5","repo":"AlistGo/alist","slug":"xml-encoding-q-declared-but-decoder-charsetreade","errorCode":null,"errorMessage":"xml: encoding %q declared but Decoder.CharsetReader is nil","messagePattern":"xml: encoding %q declared but Decoder\\.CharsetReader is nil","errorType":"validation","errorClass":null,"httpStatus":400,"severity":"error","filePath":"server/webdav/internal/xml/xml.go","lineNumber":618,"sourceCode":"\t\t\tif b0 == '?' && b == '>' {\n\t\t\t\tbreak\n\t\t\t}\n\t\t\tb0 = b\n\t\t}\n\t\tdata := d.buf.Bytes()\n\t\tdata = data[0 : len(data)-2] // chop ?>\n\n\t\tif target == \"xml\" {\n\t\t\tcontent := string(data)\n\t\t\tver := procInst(\"version\", content)\n\t\t\tif ver != \"\" && ver != \"1.0\" {\n\t\t\t\td.err = fmt.Errorf(\"xml: unsupported version %q; only version 1.0 is supported\", ver)\n\t\t\t\treturn nil, d.err\n\t\t\t}\n\t\t\tenc := procInst(\"encoding\", content)\n\t\t\tif enc != \"\" && enc != \"utf-8\" && enc != \"UTF-8\" {\n\t\t\t\tif d.CharsetReader == nil {\n\t\t\t\t\td.err = fmt.Errorf(\"xml: encoding %q declared but Decoder.CharsetReader is nil\", enc)\n\t\t\t\t\treturn nil, d.err\n\t\t\t\t}\n\t\t\t\tnewr, err := d.CharsetReader(enc, d.r.(io.Reader))\n\t\t\t\tif err != nil {\n\t\t\t\t\td.err = fmt.Errorf(\"xml: opening charset %q: %v\", enc, err)\n\t\t\t\t\treturn nil, d.err\n\t\t\t\t}\n\t\t\t\tif newr == nil {\n\t\t\t\t\tpanic(\"CharsetReader returned a nil Reader for charset \" + enc)\n\t\t\t\t}\n\t\t\t\td.switchToReader(newr)\n\t\t\t}\n\t\t}\n\t\treturn ProcInst{target, data}, nil\n\n\tcase '!':\n\t\t// <!: Maybe comment, maybe CDATA.\n\t\tif b, ok = d.mustgetc(); !ok {","sourceCodeStart":600,"sourceCodeEnd":636,"githubUrl":"https://github.com/AlistGo/alist/blob/843d9dc8149126976b2625911e45a4d3ffd6f2f5/server/webdav/internal/xml/xml.go#L600-L636","documentation":"Error \"xml: encoding %q declared but Decoder.CharsetReader is nil\" thrown in AlistGo/alist.","triggerScenarios":"Thrown at server/webdav/internal/xml/xml.go:618 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Send a well-formed XML 1.0 request body with a supported encoding and retry."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"843d9dc8149126976b2625911e45a4d3ffd6f2f5","analyzedAt":"2026-08-15T12:14:11.722Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}