/usr/local/lib/swipl/library/ext/http/http/mimetype.pl
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 file_content_type(+File:atom, -ContentType:atom) is det
 file_content_type(+File:atom, ?MediaType, -ContentType:atom) is det
True if File should be served using ContentType: ContentType. It takes the following steps:
  1. Determine the media type using file_mime_type/2, unless already specified using file_content_type/3.
  2. Determine it is a text file using text_mimetype/1
  3. Use the charset from the Prolog flag default_charset

The behavior is controlled by several hooks and a flag.

  • mime:mime_extension/2 defines the media type
  • text_mimetype/1 defines the media type is text
  • mime:charset/3 derives the charset for a file with a given media type, if the media type is text according to text_mimetype/1.
  • If text_mimetype/1 succeeds and mime:charset/3 fails, the flag default_charset defines the charset unless it is set to -. The flag set by default to UTF-8 if the Prolog flag encoding is set to utf8.