import content types from https://cs.opensource.google/go/go/+/refs/tags/go1.20.3:src/mime/type.go;l=111 and https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types

contenttype.go

@@ -15,57 +15,174 @@ func SetContentTypeIfMedia(w http.ResponseWriter, r *http.Request) {
 	k := "Content-Type"
 	v := ""
 	switch ext {
-	case ".mp4":
-		v = "video/mp4"
 	case ".mkv":
 		v = "video/x-matroska"
-	case ".mp3":
-		v = "audio/mpeg3"
 	case ".epub", ".mobi":
+		v = "application/epub+zip"
 		k = "Content-Disposition"
 		v = "attachment"
-	case ".jpg", ".jpeg":
-		v = "image/jpeg"
 	case ".md":
 		v = "text/markdown"
 		v = "text/html"
-	case ".gif":
-		v = "image/gif"
-	case ".png":
-		v = "image/png"
 	case ".ico":
 		v = "image/x-icon"
-	case ".svg":
-		v = "image/svg+xml"
-	case ".css":
-		v = "text/css"
-	case ".js":
-		v = "text/javascript"
-	case ".json":
-		v = "application/json"
-	case ".html", ".htm":
-		v = "text/html"
 	case ".pdf":
 		w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", path.Base(r.URL.Path)))
 		v = "application/pdf"
-	case ".webm":
-		v = "video/webm"
-	case ".weba":
-		v = "audio/webm"
-	case ".webp":
-		v = "image/webp"
-	case ".zip":
-		v = "application/zip"
-	case ".7z":
-		v = "application/x-7z-compressed"
-	case ".tar":
-		v = "application/x-tar"
 	case ".m4b":
 		v = "application/octet-stream"
-	case ".xml", ".rss", ".feed", ".rdf":
+	case ".rss", ".feed", ".rdf":
 		v = "application/rss+xml"
+
+	case ".htm":
+		v = "text/html; charset=utf-8"
+	case ".html":
+		v = "text/html; charset=utf-8"
+	case ".jpeg":
+		v = "image/jpeg"
+	case ".jpg":
+		v = "image/jpeg"
 	case ".wasm":
 		v = "application/wasm"
+
+	case ".aac":
+		v = "audio/aac"
+	case ".abw":
+		v = "application/x-abiword"
+	case ".arc":
+		v = "application/x-freearc"
+	case ".avif":
+		v = "image/avif"
+	case ".avi":
+		v = "video/x-msvideo"
+	case ".azw":
+		v = "application/vnd.amazon.ebook"
+	case ".bin":
+		v = "application/octet-stream"
+	case ".bmp":
+		v = "image/bmp"
+	case ".bz":
+		v = "application/x-bzip"
+	case ".bz2":
+		v = "application/x-bzip2"
+	case ".cda":
+		v = "application/x-cdf"
+	case ".csh":
+		v = "application/x-csh"
+	case ".css":
+		v = "text/css"
+	case ".csv":
+		v = "text/csv"
+	case ".doc":
+		v = "application/msword"
+	case ".docx":
+		v = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+	case ".eot":
+		v = "application/vnd.ms-fontobject"
+	case ".gz":
+		v = "application/gzip"
+	case ".gif":
+		v = "image/gif"
+	case ".htm,":
+		v = ".html text/html"
+	case ".ics":
+		v = "text/calendar"
+	case ".jar":
+		v = "application/java-archive"
+	case ".jpeg,":
+		v = ".jpg image/jpeg"
+	case ".js":
+		v = "text/javascript (Specifications: HTML and RFC 9239)"
+	case ".json":
+		v = "application/json"
+	case ".jsonld":
+		v = "application/ld+json"
+	case ".mid,":
+		v = ".midi audio/midi, audio/x-midi"
+	case ".mjs":
+		v = "text/javascript"
+	case ".mp3":
+		v = "audio/mpeg"
+	case ".mp4":
+		v = "video/mp4"
+	case ".mpeg":
+		v = "video/mpeg"
+	case ".mpkg":
+		v = "application/vnd.apple.installer+xml"
+	case ".odp":
+		v = "application/vnd.oasis.opendocument.presentation"
+	case ".ods":
+		v = "application/vnd.oasis.opendocument.spreadsheet"
+	case ".odt":
+		v = "application/vnd.oasis.opendocument.text"
+	case ".oga":
+		v = "audio/ogg"
+	case ".ogv":
+		v = "video/ogg"
+	case ".ogx":
+		v = "application/ogg"
+	case ".opus":
+		v = "audio/opus"
+	case ".otf":
+		v = "font/otf"
+	case ".png":
+		v = "image/png"
+	case ".php":
+		v = "application/x-httpd-php"
+	case ".ppt":
+		v = "application/vnd.ms-powerpoint"
+	case ".pptx":
+		v = "application/vnd.openxmlformats-officedocument.presentationml.presentation"
+	case ".rar":
+		v = "application/vnd.rar"
+	case ".rtf":
+		v = "application/rtf"
+	case ".sh":
+		v = "application/x-sh"
+	case ".svg":
+		v = "image/svg+xml"
+	case ".tar":
+		v = "application/x-tar"
+	case ".tif,":
+		v = ".tiff image/tiff"
+	case ".ts":
+		v = "video/mp2t"
+	case ".ttf":
+		v = "font/ttf"
+	case ".txt":
+		v = "text/plain"
+	case ".vsd":
+		v = "application/vnd.visio"
+	case ".wav":
+		v = "audio/wav"
+	case ".weba":
+		v = "audio/webm"
+	case ".webm":
+		v = "video/webm"
+	case ".webp":
+		v = "image/webp"
+	case ".woff":
+		v = "font/woff"
+	case ".woff2":
+		v = "font/woff2"
+	case ".xhtml":
+		v = "application/xhtml+xml"
+	case ".xls":
+		v = "application/vnd.ms-excel"
+	case ".xlsx":
+		v = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+	case ".xml":
+		v = "application/xml"
+	case ".xul":
+		v = "application/vnd.mozilla.xul+xml"
+	case ".zip":
+		v = "application/zip"
+	case ".3gp":
+		v = "video/3gpp; audio/3gpp if it doesn't contain video"
+	case ".3g2":
+		v = "video/3gpp2; audio/3gpp2 if it doesn't contain video"
+	case ".7z":
+		v = "application/x-7z-compressed"
 	default:
 		return
 	}