Hi, some iOS requests to gateway.icloud.com via squid (explicit) throw the following error in the logs: 2020-07-23T15:31:08+10:00 00.11.22.68 (squid-1): ABCD::17 (iphoneXs.domain.com) - via -:- - - [23/Jul/2020:15:31:08 +1000] "- error:invalid-request HTTP/1.1" 400 3739 "-" "-" NONE_NONE:HIER _NONE (mode:- sni:-) Cache file logging of HTTP only shows Squid's response (not the client request). tcpdump gives the following TCP stream (in ASCII): C->S: ................_\...&_<.@4..../..K.......' ........z...h.q.B..H..c....0L>...4.......,.+.$.#. . ...0./.(.'...........=.<.5./..... ..................gateway.icloud.com..... ..............................................h2.http/1.1.......3.&.$... R..{V$_<]..yM..L...1b ..d...). ..-.....+. .......... . ......................................................................................................................................................................................................................... S->C: HTTP/1.1 400 Bad Request Server: squid/5.0.1-20200312-r8a511d5e0 Mime-Version: 1.0 Date: Thu, 23 Jul 2020 05:00:20 GMT Content-Type: text/html;charset=utf-8 Content-Length: 3406 X-Squid-Error: ERR_PROTOCOL_UNKNOWN 0 Vary: Accept-Language Content-Language: en X-Cache: MISS from proxy-01.thismonkey.com Connection: close <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html><head> <meta type="copyright" content="Copyright (C) 1996-2020 The Squid Software Foundation and contributors"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>ERROR: The requested URL could not be retrieved</title> <style type="text/css"><!-- <snip> Does anyone know what type of request the client is sending? And why squid is unhappy with it? To my eye it doesn't look like HTTP - perhaps the h2 is a clue? Thanks _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users