{"record":{"id":"3f96efc30702e9cd","repo":"IceWhaleTech/CasaOS","slug":"parsefileheader-fail-s","errorCode":null,"errorMessage":"ParseFileHeader fail:%s","messagePattern":"ParseFileHeader fail:(.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/utils/file/file.go","lineNumber":755,"sourceCode":"\t\tread_total += read_len\n\t\tif !found_boundary {\n\t\t\tboundary_loc = bytes.LastIndex(read_data[:read_total], boundary)\n\t\t\tif boundary_loc == -1 {\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\tfound_boundary = true\n\t\t}\n\t\tstart_loc := boundary_loc + len(boundary)\n\t\tfmt.Println(string(read_data))\n\t\tfile_head_loc := bytes.Index(read_data[start_loc:read_total], []byte(\"\\r\\n\\r\\n\"))\n\t\tif file_head_loc == -1 {\n\t\t\tcontinue\n\t\t}\n\t\tfile_head_loc += start_loc\n\t\tret := false\n\t\theadMap, ret := ParseFileHeader(read_data, boundary)\n\t\tif !ret {\n\t\t\treturn headMap, nil, fmt.Errorf(\"ParseFileHeader fail:%s\", string(read_data[start_loc:file_head_loc]))\n\t\t}\n\t\treturn headMap, read_data[file_head_loc+4 : read_total], nil\n\t}\n\treturn nil, nil, fmt.Errorf(\"reach to sream EOF\")\n}\n","sourceCodeStart":737,"sourceCodeEnd":761,"githubUrl":"https://github.com/IceWhaleTech/CasaOS/blob/0d3b2f444ec0193193cf03eef6d43c6e35b0183e/pkg/utils/file/file.go#L737-L761","documentation":"ParseFromHead found the boundary and the CRLFCRLF header terminator, but the nested ParseFileHeader call failed to extract a valid header map from the buffered bytes. The returned error embeds the raw header slice so the developer can see exactly which bytes were unparseable.","triggerScenarios":"A multipart part whose Content-Disposition header is malformed — missing 'name='/'filename=' parameters, wrong field ordering, or binary garbage between the boundary and the CRLFCRLF terminator — when ParseFileHeader is called with the buffer and boundary.","commonSituations":"Non-browser clients (curl scripting, custom SDKs) sending hand-built multipart headers; header lines with bare LF instead of CRLF; charset issues; truncated body where the header region is cut mid-line.","solutions":["Inspect the header bytes included in the error message — they show the exact malformed Content-Disposition.","Fix the client to use a standard multipart writer (Go mime/multipart.Writer, curl -F) so headers are well-formed CRLF-terminated.","Make ParseFileHeader more lenient (case-insensitive header names, optional filename) if you must accept loose clients.","Reject with HTTP 400 and a clear message instead of retrying — the body will not change."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// Sanity-check the part header region before parsing\nif !bytes.Contains(readData[startLoc:readTotal], []byte(\"Content-Disposition\")) {\n\treturn errors.New(\"multipart part is missing Content-Disposition\")\n}","typeGuard":null,"tryCatchPattern":"headMap, data, err := file.ParseFromHead(buf, 0, boundary, stream)\nif err != nil && strings.Contains(err.Error(), \"ParseFileHeader fail\") {\n\t// header bytes are embedded in the error — log them and reject with 400\n\tlog.Warn(\"bad multipart header\", zap.String(\"header\", err.Error()))\n\treturn http.StatusBadRequest, errors.New(\"malformed multipart header\")\n}","preventionTips":["Use standard multipart writers/clients (mime/multipart, curl -F) so headers are always CRLF-correct","Reject requests lacking a well-formed Content-Disposition early","Keep the header bytes in errors (as this code does) for fast diagnosis"],"tags":["multipart","parsing","http","upload"],"backgroundTag":null,"analyzedSha":"0d3b2f444ec0193193cf03eef6d43c6e35b0183e","analyzedAt":"2026-08-15T13:27:57.821Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}