The following variables needs to be implemented inside libModSecurity: - MULTIPART_BOUNDARY_QUOTED - MULTIPART_BOUNDARY_WHITESPACE - MULTIPART_CRLF_LINE - MULTIPART_DATA_AFTER - MULTIPART_DATA_BEFORE - MULTIPART_FILE_LIMIT_EXCEEDED - MULTIPART_FILENAME - MULTIPART_HEADER_FOLDING - MULTIPART_INVALID_HEADER_FOLDING - MULTIPART_INVALID_PART - MULTIPART_INVALID_QUOTING - MULTIPART_LF_LINE - MULTIPART_MISSING_SEMICOLON - MULTIPART_NAME - MULTIPART_STRICT_ERROR More information about these variables can be found at ModSecurity reference manual: https://github.com/SpiderLabs/ModSecurity/wiki/Reference-Manual