The full name of mime is "Multipurpose Internet Mail Extensions" multi-function Internet Mail extended service, which is a multi-purpose Internet Mail extended protocol. It was first used in the email system in 1992, but it will also be applied to browsers later. The server will tell the browser the type of multimedia data they send, and the notification means to indicate the MIME type of the multimedia data, so that the browser can know the received information which is MP3 files, which are shockwave files. The server puts the mime token into the transmitted data to tell the browser which plug-in is used to read the relevant file. Mime supports mail messages in multiple formats, including non-ASCII characters and binary format attachments. This standard is defined in; RFC 2045,; RFC 2046,; RFC 2047 ,;
RFC 2048, and RFC 2049. RFC 822, which is transformed from RFC 2822, stipulates that the email standard does not allow seven characters other than the ASCII character set in the email message. For this reason, non-English-character messages and binary files, images, sounds, and other non-text messages cannot be transmitted in emails. Mime specifies a symbolic method used to represent a variety of data types. After the browser receives the file, it will go to the plug-in system to find out which plug-in can identify and read the received file. If the browser does not know which plug-in system to call, it may tell the user that a plug-in is missing, or directly select an existing plug-in to try to read the received file, the latter may cause a system crash. The absence of mime identifiers in the transmitted information may make it difficult to estimate the situation, because some computer systems may not have any faults, but some computers may crash.
