google chrome - How can I enable Cross-Origin data access with PageSpeed Service? -


i have page uses html canvas , javascript extract colours image. i've ensured images pulled server directly, rather cdn.

i've set server headers access-control-allow-origin:*. working until enabled google's pagespeed service. triggering script (clicking on 1 of icons) produces dreaded unable image data canvas because canvas has been tainted cross-origin data. error (it works fine when bypassing pagespeed however).

i've disabled image hosting in pagespeed control panel, seemed work, morning i'm seeing error again.

pagespeed control panel

i've ensured .js file manipulates canvas excluded pagespeed optimizations. know can disable pagespeed url, seems rather heavy handed (especially so, given there pages below base url need optimizations, there's no way can see exclude 1 url while including subdirectories in pagespeed).

how can find out what's triggering error? in other words, chrome think cross-origin data coming from?


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