I use Mod_pagespeed last stable version and i see it's remove the exiting image canonical headers even when all filters are off and only ModPagespeed on. here is my details when everything off and it's still remove the headers from images:
mod_pagespeed on
Filters:
db Debug
hw Flushes html
Options:
EnableCachePurge (euci) True
EnableRewriting (e) 1
FetchWithGzip (afg) True
FileCacheCleanIntervalMs (afcci) 3600000
FileCacheInodeLimit (afcl) 500000
FileCacheSizeKb (afc) 102400
HttpCacheCompressionLevel (hccl) 9
RewriteLevel (l) Pass Through
RunExperiment (fur) False
Statistics (ase) True
StatisticsLogging (asle) True
#NumFlushes 0
#EndDocument after 9187us
#Total Parse duration 1670us
#Total Render duration 642us
#Total Idle duration 7517us
The following filters were disabled for this request:
SupportNoscript
I see this update and think it's maybe the IPRO but like i sad before, it's happen even no filters are on.
I see this (future) update to and think if this will gonna slove the problem?
But still, i think my bug report is more basic then the problem from the link above, pagespeed always did not need to modify canonical headers if some filters are off
Thank you.