Hello again, I have quickly setup a Squid version 3.5.26 on Windows and with a minimalist config file: ------------------------------------------------------------------- acl allsrc src all http_access allow allsrc http_port 3128 cache_dir ufs /cygdrive/c/squidcache 100 16 256 coredump_dir /var/cache/squid refresh_pattern \.(jpg|gif|png|txt|docx|xlsx|pdf) 60 90% 600 override-expire reload-into-ims ignore-private refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 # Reverse Proxy settings https_port 10.10.10.10:443 accel defaultsite=olicomp.sharepoint.com cert=/cygdrive/c/squidssl/sharepoint.com.crt key=/cygdrive/c/squidssl/sharepoint.com.key cache_peer 123.123.123.123 parent 443 0 originserver login=PASSTHRU connection-auth=on ssl sslflags=DONT_VERIFY_PEER ------------------------------------------------------------------- Same result. I can see the cache disk folder being filled up. But the HIT will never happen. Latency stay high, speed stay low on document access / file transfer. Can Microsoft SharePoint Servers in Office 365 block any caching attempt ? Also, I am using a WebDAV client. Is WebDAV supported ? ------------------------------------------------------------------- Cache information for squid: Hits as % of all requests: 5min: 0.0%, 60min: 0.0% Hits as % of bytes sent: 5min: 0.0%, 60min: 0.0% Memory hits as % of hit requests: 5min: 0.0%, 60min: 0.0% ------------------------------------------------------------------- Regards, Olivier MARCHETTA -----Original Message----- From: Olivier MARCHETTA Sent: Tuesday, August 29, 2017 2:47 PM To: 'Amos Jeffries' <squid3@xxxxxxxxxxxxx>; squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: RE: Squid Reverse Proxy and WebDAV caching Hello Amos, Thank you for your answer. I have applied the configuration updates you recommended. My squid config file is more simple now. But unfortunately, I can see the cache filling itselt, but not being hit. Here's the internal manager info log: ------------------------------------------------------------------------------ Cache information for squid: Hits as % of all requests: 5min: 0.0%, 60min: 0.0% Hits as % of bytes sent: 5min: 0.4%, 60min: 0.4% Memory hits as % of hit requests: 5min: 0.0%, 60min: 0.0% Disk hits as % of hit requests: 5min: 0.0%, 60min: 0.0% Storage Swap size: 70752 KB Storage Swap capacity: 69.1% used, 30.9% free Storage Mem size: 216 KB Storage Mem capacity: 0.2% used, 99.8% free Mean Object Size: 1768.80 KB Requests given to unlinkd: 56 ------------------------------------------------------------------------------ As you can see, the cache swap capacity has been filled at 70%. But when I try to get the same content from another computer, the transfer is slow and the HIT percentage stay at 0. I have noticed the following errors in the Cache.log: Could not parse headers from on disk object I don't really know what to do next. I do not understand what this error means. My squid.conf file below: ------------------------------------------------------------------------------ # This file is automatically generated by pfSense # Do not edit manually ! http_port 10.10.10.10.108:3128 icp_port 0 digest_generation off dns_v4_first on pid_filename /var/run/squid/squid.pid cache_effective_user squid cache_effective_group proxy error_default_language en icon_directory /usr/local/etc/squid/icons visible_hostname pfSense Firewall cache_mgr pfsense@virtualdesk.cloud access_log /var/squid/logs/access.log cache_log /var/squid/logs/cache.log cache_store_log none netdb_filename /var/squid/logs/netdb.state pinger_enable on pinger_program /usr/local/libexec/squid/pinger logfile_rotate 7 debug_options rotate=7 shutdown_lifetime 3 seconds forwarded_for on uri_whitespace strip cache_mem 128 MB maximum_object_size_in_memory 256 KB memory_replacement_policy heap GDSF cache_replacement_policy heap LFUDA minimum_object_size 0 KB maximum_object_size 20 MB cache_dir ufs /var/squid/cache 100 16 256 offline_mode off cache_swap_low 90 cache_swap_high 95 cache allow all refresh_pattern \.(jpg|gif|png|txt|docx|xlsx|pdf) 60 90% 600 override-expire reload-into-ims ignore-private # Add any of your own refresh_pattern entries above these. refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 # Reverse Proxy settings https_port 10.10.10.10:443 accel cert=/usr/local/etc/squid/599eae0080989.crt key=/usr/local/etc/squid/599eae0080989.key # cache_peer tenant.sharepoint.com parent 443 0 originserver login=PASSTHRU connection-auth=on ssl sslflags=DONT_VERIFY_PEER acl allsrc src all http_access allow all ------------------------------------------------------------------------------ PS: I will keep the DON’T_VERIFY_PEER for testing but I understand this is a security risk. Thanks. Regards, Olivier MARCHETTA -----Original Message----- From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Amos Jeffries Sent: Saturday, August 26, 2017 5:21 AM To: squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: Re: Squid Reverse Proxy and WebDAV caching On 26/08/17 00:49, Olivier MARCHETTA wrote: > Hello, > > Finally Squid is caching my SharePoint online documents. > But it doesn't work yet. > If I enable offline mode, the WebDAV client will not be able to download documents from the cache. That directive was designed for HTTP/1.0 behaviours and only works for objects with optional revalidation. When the server delegates caching freshness decision to the proxy. When it is applied to content with mandatory revalidation; such as anything with no-cache, private, no-store, must-revalidate directives in HTTP/1.1 traffic. The result is that things are prohibited from being delivered AND prohibited from being updated. > And I will see the following errors in the log: > > --------------------------------------------------------------------------------- > TCP_OFFLINE_HIT_ABORTED/000 https://tenant.sharepoint.com/sites/Marketing/Shared%20Documents/large1%20-%20Copy%20-%20Copy%20-%20Copy%20-%20Copy.docx > TCP_OFFLINE_HIT_ABORTED/000 https://tenant.sharepoint.com/sites/Marketing/Shared%20Documents/large1%20-%20Copy%20-%20Copy%20-%20Copy%20-%20Copy.docx > ---------------------------------------------------------------------- > ----------- > Squid was simply not able to deliver anything to this client, not even an error message for some reason. It might be bugs in Squid preventing it generating an error page (ABORTED with 5xx status). But usually ABORTED/000 means the client was the one aborting / disconnecting before any HTTP response at all could be delivered. > If I disable offline mode, then nothing gets downloaded from the cache. How are you determining that? What I can see in the info so far provided is that Squid *is* finding cached content to work with. > > I have removed all ACL control from the squid conf (to make it easier for now). > I have replaced all refresh patterns by customs one (that I've found on Internet from another SharePoint caching project). > > Sorry for the long file below, but I am posting my conf file again. > I don't know why the Squid cache is aborting the cache HIT. You are forcing Squid to cache things that are marked as non-cacheable because they contain client-specific security or privacy details. Since the proxy is unable to determine for itself (on these objects) what details go to which client caching these things can only be done with revalidation before HIT delivery. Then you are also configuring Squid to be forbidden to revalidate anything at all. I suspect we have a bug somewhere in Squid that makes it do the ABORT/000, it should be doing a forced-MISS or a 5xx error with your config. But that is not what you are needing to happen anyhow, so fixing that particular bug wont help you. > If you have any clue, it would be very welcome. > > > --------------------------------------------------------------------------------- > http_port 92.222.209.108:3128 > icp_port 0 > digest_generation off > dns_v4_first on > pid_filename /var/run/squid/squid.pid > cache_effective_user squid > cache_effective_group proxy > error_default_language en > icon_directory /usr/local/etc/squid/icons > visible_hostname sv-1101-wvp01.virtualdesk.cloud > cache_mgr pfsense@virtualdesk.cloud > access_log /var/squid/logs/access.log > cache_log /var/squid/logs/cache.log > cache_store_log none > netdb_filename /var/squid/logs/netdb.state > pinger_enable on > pinger_program /usr/local/libexec/squid/pinger > > logfile_rotate 7 > debug_options rotate=7 > shutdown_lifetime 3 seconds > # Allow local network(s) on interface(s) > acl localnet src 92.222.209.0/24 > forwarded_for on > uri_whitespace strip > > > cache_mem 128 MB > maximum_object_size_in_memory 512 KB > memory_replacement_policy heap GDSF > cache_replacement_policy heap LFUDA > minimum_object_size 0 KB > maximum_object_size 20 MB > cache_dir ufs /var/squid/cache 100 16 256 > offline_mode off > cache_swap_low 90 > cache_swap_high 95 > cache allow all > > # Cache documents regardless what the server says > refresh_pattern .jpg 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .gif 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .png 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .txt 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .doc 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .docx 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .xls 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .xlsx 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern .pdf 14400 50% 18000 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private ignore-auth > The normal refresh_pattern lines should stay. Just be down here following your custom ones. At minimum the cgi-bin and '.' patterns are necessary for correct handling of dynamic content in the cache. [ Sorry I pressed send by accident earlier before completing that "Also," statement which was intended to say that. ] * The ignore-no-cache option was removed from Squid some versions ago. As I mentioned earlier CC:no-cache actually means things *are* cacheable in HTTP/1.1, so the directives intended effect is met by current Squids default behaviour. * The 50% only means +50% of the objects current age. Which can be very short for frequently or recently updated objects. Percentages over 100% are possible here, and usually necessary for good caching times. * override-lastmod was useful once to avoid bugs (and side-effects from misconfigured percentages mentioned above). But current Squid can figure out Last-Modified values from Dates and timestamps as needed. So the option is rarely necessary and more often than not actually causes worse caching in by prohibiting Squid from doing heuristic freshness calculations YMMV so testing for your specific traffic is needed before use of this option in current Squid. --> and remember how I mentioned offline_mode only works when the proxy is delegated the freshness calculations? this prohibits Squid from doing that calculation and uses the admin 14400 minute value instead. * "reload-into-ims ignore-reload" these two options are mutually exclusive. Changing a reload header value and ignoring it cannot be done simultaneously. Pick one: ignore-reload - completely ignore the client indication that it needs the latest data. Note that this is redundant with what offline_mode does, but far more selective about what URLs it happens for. reload-into-ims - ask the server if any changes have happened, so the cached content can be delivered if none instead of a full re-fetch. * Since all of these lines are identical except the regex pattern for URLs they apply to. You would save a lot more CPU cycles by combining the regex into one pattern and only having one config line for the lot. refresh_pattern \.(jpg|gif|png|txt|docx?|xlsx?pdf) 14400 50% 18000 \ override-expire reload-into-ims ignore-private ignore-auth * ignore-auth - I would also check the actual response headers from the server before using this option. While authentication credentials normally means non-cacheable in HTTP/1.0 traffic in HTTP/1.1 they mean mandatory revalidation in most cases and sometimes are irrelevant. What this option actually does is exclude special handling when auth headers are present - it actively *prevents* some HTTP/1.1 traffic being HIT on, when the special conditions were saying auth was cacheable or irrelevant. > # Setup acls > acl allsrc src all > http_access allow all > > request_body_max_size 0 KB > delay_pools 1 > delay_class 1 2 > delay_parameters 1 -1/-1 -1/-1 > delay_initial_bucket_level 100 > delay_access 1 allow allsrc These delay_parameters are doing nothing but wasting a surprisingly large amount of CPU time and memory for calculating traffic numbers and repeatedly pausing transactions for 0 milliseconds. > > # Reverse Proxy settings > https_port 92.222.209.108:443 accel cert=/usr/local/etc/squid/599eae0080989.crt key=/usr/local/etc/squid/599eae0080989.key > cache_peer olicomp.sharepoint.com parent 443 0 no-query no-digest originserver login=PASSTHRU connection-auth=on ssl sslflags=DONT_VERIFY_PEER front-end-https=auto name=rvp_sharepoint Avoid DONT_VERIFY_PEER like a plague. Find out the CA(s) which sign the peer's certs and configure Squid to trust only the right CA for these peer links, then add the NO_DEFAULT_CA flag. Even if it is one of the normal global CA. That will prevent unapproved MITM on your upstream traffic and help detect traffic loops if the DNS+Squid config gets wonky. > deny_info TCP_RESET allsrc This deny_info is explicitly configuring Squid to send a TCP_RESET (aka ABORTED/000) when ACL "allsrc" is the reason for transaction denial. With your access control rules removed it should not be having an effect, but beware of the above when you reinstate those rules. Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
