go/src/mime/type.go

var mimeTypes …

var mimeTypesLower …

var extensionsMu …

var extensions …

// setMimeTypes is used by initMime's non-test path, and by tests.
func setMimeTypes(lowerExt, mixExt map[string]string) { … }

var builtinTypesLower …

var once …

var (
	testInitMime …
	osInitMime …
)

func initMime() { … }

// TypeByExtension returns the MIME type associated with the file extension ext.
// The extension ext should begin with a leading dot, as in ".html".
// When ext has no associated type, TypeByExtension returns "".
//
// Extensions are looked up first case-sensitively, then case-insensitively.
//
// The built-in table is small but on unix it is augmented by the local
// system's MIME-info database or mime.types file(s) if available under one or
// more of these names:
//
//	/usr/local/share/mime/globs2
//	/usr/share/mime/globs2
//	/etc/mime.types
//	/etc/apache2/mime.types
//	/etc/apache/mime.types
//
// On Windows, MIME types are extracted from the registry.
//
// Text types have the charset parameter set to "utf-8" by default.
func TypeByExtension(ext string) string { … }

// ExtensionsByType returns the extensions known to be associated with the MIME
// type typ. The returned extensions will each begin with a leading dot, as in
// ".html". When typ has no associated extensions, ExtensionsByType returns an
// nil slice.
func ExtensionsByType(typ string) ([]string, error) { … }

// AddExtensionType sets the MIME type associated with
// the extension ext to typ. The extension should begin with
// a leading dot, as in ".html".
func AddExtensionType(ext, typ string) error { … }

func setExtensionType(extension, mimeType string) error { … }