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Sorry, not clear what issue you're talking about ? please give more details.

#rm -rf /tmp/lshttpd/bak_core/*

you need empty /tmp/lshttpd/bak_core/ first. otherwise it'll keep sending emails. if no new file create in /tmp/lshttpd/bak_core/, then the issue fixed. otherwise, please log a ticket to better trace it until it's resolved.

unfortunately you can't. they're controlled by facebook, amason, google, nobody except themselves can control that.

first please confirm it's lscache related. after disable lscache, 503 gone ?

lscache cache dynamic generated pages which usually the bottleneck, usually it's much more important than pagespeed which optimize static contents. you feel your website fast -- this is most important. you can refer the complaints, and spend time to fix them, or ignore them if no time...

not sure what exactly happen on your servers. please try: 1. rm -rf /usr/local/lsws/autoupdate/* 2. /usr/local/lsws/admin/misc/lsup.sh -f -v 5.2.1 to see if the issue will be gone.

please refer https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:config:enable_pagespeed

those errors should be in /etc/apache2/logs/error_log if cPanel/WHM EA4

1. how about lsws 5.1.17 ? 2. please check cPanel Admin Home → Software → Multi-PHP Manager, to have cloudlinux alt-php work, the domain's PHP version should be same as "System PHP Version"

settings of Configuration -> Server -> Script Handler ? you needn't edit lsphp56, since after editing, lsphp56 almost same as cl_phpselector ? right, cl_phpselector is just for cloudliunx php selector. in above Script Handler, for php suffix, select cl_phpselector as handler

Thanks much for the detailed explanation. much clear for me now. so all clients much log in first ? so the backend php know which group the client belong to ? then different cache to serve different groups(or log in users) ?

here's lscache api document: https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:cache:developer_guide not sure if Cache Vary and/or esi can implement the "preflight request" feature or close to the feature ? I mainly from an end user's standpoint. can you give an example which...

can you do tests on a specific web site to illustrate the issue accurately ? using webpagetest.org as test tool 1. under apache, the TTFB (Time To First Byte) 2. under litespeed, the TTFB which not from cache (without response header: X-LiteSpeed-Cache:hit) 3. under litespeed, the TTFB which...

any of the websites has enabled lscache ?

please refer https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:php:503-errors

standard version won't work well with apache's httpd.conf. only first 5 virtual hosts are read and parsed. and, no official download link and document from current official web site regarding standard version.

can you provide temp root access, I can login to take a look.

the rewrite rule looks ok, and can work with apache and litespeed ? but has nothing to do with "Litespeed cache"

I tried out an workaround for you. here's the example php code: /usr/local/lsws/DEFAULT/html/test>cat t.php <?php $file = "lsws_logo.png"; header("Content-Length: " . filesize($file)); //header("Content-Disposition: attachment; filename=" . basename($_GET['query'])); header("Content-Disposition...