Doing so can result in IIS serving unrecognized files and displaying sensitive information to users. You can also configure IIS to serve undefined file types by adding a wildcard character (*) MIME type.ĭo not use wildcard MIME-types on production servers. You can also use wildcards for mime types in IIS, but is advised to not do this: In consequence the Keys Patterns (various file name extensions associated with the MIME type) and DefaultApp (the default application associated with this MIME type) are also deprecated. Type=MimeType is deprecated as there is a new standard for this now, see the Shared MIME-info Database specification for more information. However, please note that Key= MimeType is deprecated as there is a new standard for this. As you have pointed out a wildcard can be used when specifying the "Desktop Entry" for the the KDE and GNOME desktop environments. So that it can be used for my purpose without the need of specifying the singular file extensions/mimes? Source W3C - The Content-Type Header FieldĬan I use a wildcard like image/* for my special case? Such compound types should be represented using the "multipart" or "application" types. Such information can be used, for example, to decide whether or not to show a user the raw data from an unrecognized subtype - such an action might be reasonable for unrecognized subtypes of text, but not for unrecognized subtypes of image or audio.įor this reason, registered subtypes of audio, image, text, and video, should not contain embedded information that is really of a different type. Thus, a Content-Type of "image/xyz" is enough to tell a user agent that the data is an image, even if the user agent has no knowledge of the specific image format "xyz". In general, the top-level Content-Type is used to declare the general type of data, while the subtype specifies a specific format for that type of data. "such an action might be reasonable for unrecognized subtypes of text, but not for unrecognized subtypes of image or audio" "a Content-Type of image/xyz is enough to tell a user agent that the data is an image, even if the user agent has no knowledge of the specific image format xyz. In theory you could use an unknown Subtype such as image/xyz but W3C says explicitely: There is no single Content-Type/subtype that covers multiple image formats. There isn't a Mime Type image/generic (See "Further reading" below for the full list of IANA registered image subtypes).ĭoes it mean that there is a mime-type for multiple image files? Mime Types are specified as Content-Type/subtype So without the correct mimetype or extension there would be no way to correctly identify the type of the file. SVG files, for example, are just XML files. Not all image files have a header that identifies their type. You need a Mime Type in order to know how to process a file (without having to read the file header). Normally there isn't, but there are a couple of exceptions documented later in this answer. Is there a generic mime-type for all image files?
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