diff --git a/net/extension_map.json b/net/extension_map.json
index 2fbe0c8854..9152a228ab 100644
--- a/net/extension_map.json
+++ b/net/extension_map.json
@@ -1,5 +1,6 @@
 {
   "": "application/octet-stream",
+  ".7z": "application/x-7z-compressed",
   ".aac": "audio/aac",
   ".abw": "application/x-abiword",
   ".arc": "application/octet-stream",
@@ -18,6 +19,7 @@
   ".epub": "application/epub+zip",
   ".es": "application/ecmascript",
   ".gif": "image/gif",
+  ".gz": "application/gzip",
   ".htm": "text/html",
   ".html": "text/html",
   ".ico": "image/x-icon",
@@ -27,10 +29,14 @@
   ".jpg": "image/jpeg",
   ".js": "application/javascript",
   ".json": "application/json",
+  ".md": "text/markdown",
   ".mid": "audio/x-midi",
   ".midi": "audio/x-midi",
+  ".mp3": "audio/mpeg",
+  ".mp4": "video/mpeg",
   ".mpeg": "video/mpeg",
   ".mpkg": "application/vnd.apple.installer+xml",
+  ".less": "text/less",
   ".odp": "application/vnd.oasis.opendocument.presentation",
   ".ods": "application/vnd.oasis.opendocument.spreadsheet",
   ".odt": "application/vnd.oasis.opendocument.text",
@@ -45,11 +51,15 @@
   ".rar": "application/x-rar-compressed",
   ".rtf": "application/rtf",
   ".sh": "application/x-sh",
+  ".sass": "text/x-sass",
+  ".scss": "text/x-scss",
   ".svg": "image/svg+xml",
   ".swf": "application/x-shockwave-flash",
   ".tar": "application/x-tar",
+  ".tar.gz": "application/tar+gzip",
   ".tif": "image/tiff",
   ".tiff": "image/tiff",
+  ".toml": "application/toml",
   ".ts": "application/typescript",
   ".ttf": "font/ttf",
   ".txt": "text/plain",