I have a website http://dermadoc.ch with several images that are no more displayed (mostly by IE versions) My server shows no errors but the browser just displays the broken image symbol.The images seem fine, for example http://dermadoc.ch/images/canfield.jpg$ identify canfield.jpgcanfield.jpg JPEG 153x115 153x115+0+0 8-bit sRGB 5.55KB 0.000u 0:00.000browsershots.org shows no problem with any version, but I have some IE 11 examples where the images are not shown.It's seems that the problem is intermittent (see comments).The files were not modified since ages and I don't remember any relevant changes in the Apache config but the inclusion of IPv6 Adresses (but this was months ago and the problems are newer).The corresponding vhost definition<VirtualHost 78.47.122.114:80 [2a01:4f8:d13:f44::2]:80>    ServerAdmin matteo@corti.li    DocumentRoot /var/www/dermadoc.ch/    RequestHeader unset If-Modified-Since    RequestHeader unset If-None-Match   <IfModule mod_headers.c>     <FilesMatch \.(js|css|xml|gz|html)$>        Header append Vary: Accept-Encoding      </FilesMatch>    </IfModule>    <Directory /var/www/dermadoc.ch/>       Options +Includes       AllowOverride AuthConfig            </Directory>    ServerName dermadoc.ch    ServerAlias www.dermadoc.ch    ErrorLog logs/dermadoc.ch-error_log    CustomLog logs/dermadoc.ch-access_log combined    XBitHack on</VirtualHost>Some images are displayed as broken, most likely only partially transmitted.Are there some global settings that could have been changed by an Apache update?Are there known problem with latest updates on Fedora?UpdateLooking at the log entries I notice that the size of the object varies greatly (from 1KB to 5KB for the very same file)Why does Apache deliver different content for the same file?For the file in my example (the first number is the number of entries in the log and the second the size):  1 1150  8 5472 11 5500142 5549Update 2Completely removed mod_deflate.so. No improvementsUpdate 3The delivered headers seems OK (with the correct size 5500)HTTP/1.1 200 OKDate: Thu, 24 Mar 2016 17:13:39 GMTServer: Apache/2.4.18 (Fedora) OpenSSL/1.0.2g-fips PHP/5.6.19 SVN/1.9.3 mod_wsgi/4.4.8 Python/2.7.10Last-Modified: Thu, 24 Mar 2016 13:58:14 GMTETag: 157c-52ecbd675dda8Accept-Ranges: bytesContent-Length: 5500Content-Type: image/jpeg
Sporadic problems with some images
apache;images