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appname/appversion indicates the application name and version.Mozilla/5.0 (platform rv:geckoversion) Gecko/geckotrail appname/appversion Mozilla/5.0 (platform rv:geckoversion) Gecko/geckotrail Firefox/firefoxversion appname/appversion Note: The recommended way of sniffing for Gecko-based browsers (if you have to sniff for the browser engine instead of using feature detection) is by the presence of the " Gecko" and " rv:" strings, since some other browsers include a " like Gecko" token.įor other products based on Gecko, the string can take one of two forms, where the tokens have the same meaning except those noted below: Experimental Feature-Policy: xr-spatial-tracking.Experimental Non-standard Feature-Policy: unsized-media.Experimental Non-standard Feature-Policy: unoptimized-images.Experimental Feature-Policy: speaker-selection.Experimental Feature-Policy: screen-wake-lock.Experimental Feature-Policy: publickey-credentials-get.

Experimental Feature-Policy: picture-in-picture.Experimental Non-standard Feature-Policy: oversized-images.Experimental Feature-Policy: microphone.Experimental Feature-Policy: magnetometer.Experimental Non-standard Feature-Policy: legacy-image-formats.Experimental Non-standard Feature-Policy: layout-animations.Experimental Feature-Policy: geolocation.Experimental Feature-Policy: fullscreen.Experimental Feature-Policy: encrypted-media.Experimental Feature-Policy: document-domain.Experimental Feature-Policy: display-capture.Experimental Feature-Policy: ambient-light-sensor.Experimental Feature-Policy: accelerometer.Reason: CORS preflight channel did not succeed.Reason: CORS header 'Origin' cannot be added.Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'.Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed.Reason: CORS header 'Access-Control-Allow-Origin' missing.Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel.Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'.Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'.Reason: CORS request external redirect not allowed.Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'.Experimental Non-standard Deprecated Viewport-Width.