another chrome bug:

navigating somewhere and back can return a REALLY OLD copy of the page

copyparty/util.py

@@ -15,6 +15,7 @@ import threading
 import mimetypes
 import contextlib
 import subprocess as sp  # nosec
+from datetime import datetime
 
 from .__init__ import PY2, WINDOWS, ANYWIN
 from .stolen import surrogateescape
@@ -47,6 +48,9 @@ if WINDOWS and PY2:
     FS_ENCODING = "utf-8"
 
 
+HTTP_TS_FMT = "%a, %d %b %Y %H:%M:%S GMT"
+
+
 HTTPCODE = {
     200: "OK",
     204: "No Content",
@@ -652,6 +656,11 @@ def exclude_dotfiles(filepaths):
     return [x for x in filepaths if not x.split("/")[-1].startswith(".")]
 
 
+def http_ts(ts):
+    file_dt = datetime.utcfromtimestamp(ts)
+    return file_dt.strftime(HTTP_TS_FMT)
+
+
 def html_escape(s, quote=False, crlf=False):
     """html.escape but also newlines"""
     s = s.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")