src/pagespeed/automatic/system_tests/image_quality_and_response.sh - incubator-pagespeed-debian - Git at Google

 set -u
 set -e

 # Rewrites an image with the specified Save-Data header and Via header;
 # verifies the content type, length, and Vary header of the response.
 function ipro_rewrite_image_and_verify_response() {
   local HAS_SAVE_DATA=$1
   local HAS_VIA=$2
   local EXPECTED_CONTENT_TYPE=$3
   local EXPECTED_VARY=$4
   local EXPECTED_CONTENT_LENGTH=$5
   local SECONDARY_HOST="optimizeforbandwidth.example.com"
   local OPT="--save-headers --user-agent=$USER_AGENT"

   local URL
   if [ -z "${STATIC_DOMAIN:-}" ]; then
     URL="http://$HOST/$IMAGE"
   fi

   local TIME_OUT_STR=""
   if [ "$EXPECTED_CONTENT_LENGTH" = "$UNOPTIMIZED" ]; then
     TIME_OUT_STR="-expect_time_out"
   fi

   local TEST_ID="IPRO rewrite image $URL UA=$USER_AGENT"
   if [ "$ACCEPT_WEBP" = true ]; then
     OPT+=" --header=Accept:image/webp"
     TEST_ID+=" Accept:webp"
   fi
   if [ "$HAS_SAVE_DATA" = true ]; then
     OPT+=" --header=Save-Data:on"
     TEST_ID+=" Save-Data:on"
   fi
   if [ "$HAS_VIA" = true ]; then
     OPT+=" --header=Via:proxy"
     TEST_ID+=" Via:proxy"
   fi

   # Fetch the image until it's optimized or timed-out.
   start_test "$TEST_ID"
   http_proxy=$SECONDARY_HOSTNAME \
     fetch_until -save $TIME_OUT_STR $URL 'grep -c W/\"PSA-aj-' 1 "$OPT"

   local TYPE="$(extract_headers $FETCH_UNTIL_OUTFILE | \
     scrape_header 'Content-Type')"
   check [ $TYPE = $EXPECTED_CONTENT_TYPE ]
   # If the image can be optimized, content length is checked against a range
   # for accommodating image encoder version difference.
   local LENGTH="$(extract_headers $FETCH_UNTIL_OUTFILE | scrape_content_length)"
   if [ "$EXPECTED_CONTENT_LENGTH" != "$UNOPTIMIZED" ]; then
     local MIN_LENGTH=`expr $EXPECTED_CONTENT_LENGTH - 30`
     local MAX_LENGTH=`expr $EXPECTED_CONTENT_LENGTH + 30`
     check [ $LENGTH -ge $MIN_LENGTH ]
     check [ $LENGTH -le $MAX_LENGTH ]
   fi
   local VARY="$(extract_headers $FETCH_UNTIL_OUTFILE | scrape_header 'Vary')"
   if [ -z $EXPECTED_VARY ]; then
     check_not_from "$(extract_headers $FETCH_UNTIL_OUTFILE)" grep -q "^Vary: "
   else
     check [ $VARY = $EXPECTED_VARY ]
   fi
 }

 # Rewrites an image using the specified user-agent. Checks the combination
 # of with and without Save-Data header and Via header.
 # With "Via", "AllowVaryOn: auto" implies "Save-Data,Accept".
 # Without "Via", "AllowVaryOn: auto" implies "Save-Data,User-Agent".
 function ipro_rewrite_image() {
   local HOST=$1
   local IMAGE=$2
   local USER_AGENT=$3
   local ACCEPT_WEBP=$4
   local EXPECTED_CONTENT_TYPE_VIA_YES=$5
   local EXPECTED_CONTENT_TYPE_VIA_NO=$6
   local EXPECTED_VARY_VIA_YES=$7
   local EXPECTED_VARY_VIA_NO=$8
   local EXPECTED_LENGTH_SD_NO_VIA_YES=$9
   local EXPECTED_LENGTH_SD_NO_VIA_NO=${10}
   local EXPECTED_LENGTH_SD_YES_VIA_YES=${11}
   local EXPECTED_LENGTH_SD_YES_VIA_NO=${12}
   # Constants
   local SAVE_DATA_YES=true
   local SAVE_DATA_NO=false
   local VIA_YES=true
   local VIA_NO=false
   # Save-Data: no, Via: yes
   ipro_rewrite_image_and_verify_response "$SAVE_DATA_NO" "$VIA_YES" \
     "$EXPECTED_CONTENT_TYPE_VIA_YES" "$EXPECTED_VARY_VIA_YES" \
     "$EXPECTED_LENGTH_SD_NO_VIA_YES"
   # Save-Data: no, Via: no
   ipro_rewrite_image_and_verify_response "$SAVE_DATA_NO" "$VIA_NO" \
     "$EXPECTED_CONTENT_TYPE_VIA_NO" "$EXPECTED_VARY_VIA_NO" \
     "$EXPECTED_LENGTH_SD_NO_VIA_NO"
   # Save-Data: yes, Via: yes
   ipro_rewrite_image_and_verify_response "$SAVE_DATA_YES" "$VIA_YES" \
     "$EXPECTED_CONTENT_TYPE_VIA_YES" "$EXPECTED_VARY_VIA_YES" \
     "$EXPECTED_LENGTH_SD_YES_VIA_YES"
   # Save-Data: yes, Via: no
   ipro_rewrite_image_and_verify_response "$SAVE_DATA_YES" "$VIA_NO" \
     "$EXPECTED_CONTENT_TYPE_VIA_NO" "$EXPECTED_VARY_VIA_NO" \
     "$EXPECTED_LENGTH_SD_YES_VIA_NO"
 }

 # Hosts
 HOST_ALLOW_ACCEPT="ipro-for-browser.example.com"
 HOST_ALLOW_AUTO="ipro-for-browser-vary-on-auto.example.com"
 HOST_ALLOW_NONE="ipro-for-browser-vary-on-none.example.com"
 # User-agents
 CHROME_MOBILE="Mozilla*Android*Mobile*Chrome/44.*"
 SAFARI_MOBILE="iPhone*Safari/8536.25"
 FIREFOX_DESKTOP="Firefox/1.5"
 # Images
 # JPEG image which will be optimized to lossy format.
 IMAGE_PUZZLE="images/Puzzle.jpg"
 # PNG image which will be optimized to lossless format.
 IMAGE_CUPPA="images/Cuppa.png"
 # PNG image which will be optimized to lossy format.
 IMAGE_BIKE="images/BikeCrashIcn.png"
 # Animated GIF which can only be optimized to animated WebP.
 IMAGE_ANIMATION="images/PageSpeedAnimationSmall.gif"
 # Qualities overriding
 UNSET_QUALITY=\
 "?PageSpeedJpegQualityForSaveData=-1&PageSpeedWebpQualityForSaveData=-1"
 SAME_QUALITY=\
 "?PageSpeedJpegQualityForSaveData=75&PageSpeedWebpQualityForSaveData=70"
 # Constants
 ACCEPT_WEBP_YES=true
 ACCEPT_WEBP_NO=false
 UNOPTIMIZED=-1

 # Allowed to vary on "Auto". Test 3 kinds of user-agents, on 3 quality levels
 # for 4 kinds of images.
 # JPEG image, optimized for Chrome on Android.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
   "Accept,Save-Data" "User-Agent,Save-Data" 33108 25774 19124 19124
 # JPEG image, optimized for Safari on iOS.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
   "Accept,Save-Data" "User-Agent,Save-Data" 73096 51452 38944 38944
 # JPEG image, optimized for Firefox on desktop.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
   "$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
   "Accept,Save-Data" "User-Agent,Save-Data" 73096 73096 38944 38944
 # Photographic PNG image, optimized for Chrome on Android.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
   "Accept,Save-Data" "User-Agent,Save-Data" 2454 2014 1476 1476
 # Photographic PNG image, optimized for Safari on iOS.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
   "Accept,Save-Data" "User-Agent,Save-Data" 3536 2606 2069 2069
 # Photographic PNG image, optimized for Firefox on desktop.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
   "$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
   "Accept,Save-Data" "User-Agent,Save-Data" 3536 3536 2069 2069
 # Non-photographic PNG image, optimized for Chrome on Android.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/png" "image/webp" \
   "" "User-Agent" 770 694 770 694
 # Non-photographic PNG image, optimized for Safari on iOS.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/png" "image/png" \
   "" "User-Agent" 770 770 770 770
 # Non-photographic PNG image, optimized for Firefox on desktop.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
   "$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/png" "image/png" \
   "" "User-Agent" 770 770 770 770
 # Animated GIF image, optimized for Chrome on Android.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/gif" "image/webp" \
   "" "User-Agent,Save-Data" "$UNOPTIMIZED" 6490 "$UNOPTIMIZED" 4312
 # Animated GIF image, optimized for Safari on iOS.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/gif" "image/gif" \
   "" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"
 # Animated GIF image, optimized for Firefox on desktop.
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
   "$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/gif" "image/gif" \
   "" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"

 # Only allow to vary on Accept, JPEG image is optimized to desktop quality.
 ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_PUZZLE" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
   "Accept" "Accept" 33108 33108 33108 33108
 # Only allow to vary on Accept, photographic PNG image is optimized to PNG and
 # Vary header is not added.
 ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_CUPPA" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_YES" "image/png" "image/png" \
   "" "" 770 770 770 770
 # Only allow to vary on Accept, animated image cannot be optimized.
 ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_ANIMATION" \
   "$SAFARI_MOBILE" "$ACCEPT_WEBP_YES" "image/gif" "image/gif" \
   "" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"
 # Nothing is allowed to vary on, JPEG image is optimized to desktop quality and
 # Vary header is not added.
 ipro_rewrite_image "$HOST_ALLOW_NONE" "$IMAGE_PUZZLE" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/jpeg" "image/jpeg" \
   "" "" 73096 73096 73096 73096
 # When quality for Save-Data was not set, Vary header does not include
 # "Save-Data".
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE$UNSET_QUALITY" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
   "Accept" "User-Agent" 33108 25774 33108 25774
 # When quality for Save-Data was set to the same for desktop, Vary header does
 # not include "Save-Data".
 ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE$SAME_QUALITY" \
   "$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
   "Accept" "User-Agent" 33108 25774 33108 25774
	set -u
	set -e

	# Rewrites an image with the specified Save-Data header and Via header;
	# verifies the content type, length, and Vary header of the response.
	function ipro_rewrite_image_and_verify_response() {
	local HAS_SAVE_DATA=$1
	local HAS_VIA=$2
	local EXPECTED_CONTENT_TYPE=$3
	local EXPECTED_VARY=$4
	local EXPECTED_CONTENT_LENGTH=$5
	local SECONDARY_HOST="optimizeforbandwidth.example.com"
	local OPT="--save-headers --user-agent=$USER_AGENT"

	local URL
	if [ -z "${STATIC_DOMAIN:-}" ]; then
	URL="http://$HOST/$IMAGE"
	fi

	local TIME_OUT_STR=""
	if [ "$EXPECTED_CONTENT_LENGTH" = "$UNOPTIMIZED" ]; then
	TIME_OUT_STR="-expect_time_out"
	fi

	local TEST_ID="IPRO rewrite image $URL UA=$USER_AGENT"
	if [ "$ACCEPT_WEBP" = true ]; then
	OPT+=" --header=Accept:image/webp"
	TEST_ID+=" Accept:webp"
	fi
	if [ "$HAS_SAVE_DATA" = true ]; then
	OPT+=" --header=Save-Data:on"
	TEST_ID+=" Save-Data:on"
	fi
	if [ "$HAS_VIA" = true ]; then
	OPT+=" --header=Via:proxy"
	TEST_ID+=" Via:proxy"
	fi

	# Fetch the image until it's optimized or timed-out.
	start_test "$TEST_ID"
	http_proxy=$SECONDARY_HOSTNAME \
	fetch_until -save $TIME_OUT_STR $URL 'grep -c W/\"PSA-aj-' 1 "$OPT"

	local TYPE="$(extract_headers $FETCH_UNTIL_OUTFILE \| \
	scrape_header 'Content-Type')"
	check [ $TYPE = $EXPECTED_CONTENT_TYPE ]
	# If the image can be optimized, content length is checked against a range
	# for accommodating image encoder version difference.
	local LENGTH="$(extract_headers $FETCH_UNTIL_OUTFILE \| scrape_content_length)"
	if [ "$EXPECTED_CONTENT_LENGTH" != "$UNOPTIMIZED" ]; then
	local MIN_LENGTH=`expr $EXPECTED_CONTENT_LENGTH - 30`
	local MAX_LENGTH=`expr $EXPECTED_CONTENT_LENGTH + 30`
	check [ $LENGTH -ge $MIN_LENGTH ]
	check [ $LENGTH -le $MAX_LENGTH ]
	fi
	local VARY="$(extract_headers $FETCH_UNTIL_OUTFILE \| scrape_header 'Vary')"
	if [ -z $EXPECTED_VARY ]; then
	check_not_from "$(extract_headers $FETCH_UNTIL_OUTFILE)" grep -q "^Vary: "
	else
	check [ $VARY = $EXPECTED_VARY ]
	fi
	}

	# Rewrites an image using the specified user-agent. Checks the combination
	# of with and without Save-Data header and Via header.
	# With "Via", "AllowVaryOn: auto" implies "Save-Data,Accept".
	# Without "Via", "AllowVaryOn: auto" implies "Save-Data,User-Agent".
	function ipro_rewrite_image() {
	local HOST=$1
	local IMAGE=$2
	local USER_AGENT=$3
	local ACCEPT_WEBP=$4
	local EXPECTED_CONTENT_TYPE_VIA_YES=$5
	local EXPECTED_CONTENT_TYPE_VIA_NO=$6
	local EXPECTED_VARY_VIA_YES=$7
	local EXPECTED_VARY_VIA_NO=$8
	local EXPECTED_LENGTH_SD_NO_VIA_YES=$9
	local EXPECTED_LENGTH_SD_NO_VIA_NO=${10}
	local EXPECTED_LENGTH_SD_YES_VIA_YES=${11}
	local EXPECTED_LENGTH_SD_YES_VIA_NO=${12}
	# Constants
	local SAVE_DATA_YES=true
	local SAVE_DATA_NO=false
	local VIA_YES=true
	local VIA_NO=false
	# Save-Data: no, Via: yes
	ipro_rewrite_image_and_verify_response "$SAVE_DATA_NO" "$VIA_YES" \
	"$EXPECTED_CONTENT_TYPE_VIA_YES" "$EXPECTED_VARY_VIA_YES" \
	"$EXPECTED_LENGTH_SD_NO_VIA_YES"
	# Save-Data: no, Via: no
	ipro_rewrite_image_and_verify_response "$SAVE_DATA_NO" "$VIA_NO" \
	"$EXPECTED_CONTENT_TYPE_VIA_NO" "$EXPECTED_VARY_VIA_NO" \
	"$EXPECTED_LENGTH_SD_NO_VIA_NO"
	# Save-Data: yes, Via: yes
	ipro_rewrite_image_and_verify_response "$SAVE_DATA_YES" "$VIA_YES" \
	"$EXPECTED_CONTENT_TYPE_VIA_YES" "$EXPECTED_VARY_VIA_YES" \
	"$EXPECTED_LENGTH_SD_YES_VIA_YES"
	# Save-Data: yes, Via: no
	ipro_rewrite_image_and_verify_response "$SAVE_DATA_YES" "$VIA_NO" \
	"$EXPECTED_CONTENT_TYPE_VIA_NO" "$EXPECTED_VARY_VIA_NO" \
	"$EXPECTED_LENGTH_SD_YES_VIA_NO"
	}

	# Hosts
	HOST_ALLOW_ACCEPT="ipro-for-browser.example.com"
	HOST_ALLOW_AUTO="ipro-for-browser-vary-on-auto.example.com"
	HOST_ALLOW_NONE="ipro-for-browser-vary-on-none.example.com"
	# User-agents
	CHROME_MOBILE="MozillaAndroidMobileChrome/44."
	SAFARI_MOBILE="iPhone*Safari/8536.25"
	FIREFOX_DESKTOP="Firefox/1.5"
	# Images
	# JPEG image which will be optimized to lossy format.
	IMAGE_PUZZLE="images/Puzzle.jpg"
	# PNG image which will be optimized to lossless format.
	IMAGE_CUPPA="images/Cuppa.png"
	# PNG image which will be optimized to lossy format.
	IMAGE_BIKE="images/BikeCrashIcn.png"
	# Animated GIF which can only be optimized to animated WebP.
	IMAGE_ANIMATION="images/PageSpeedAnimationSmall.gif"
	# Qualities overriding
	UNSET_QUALITY=\
	"?PageSpeedJpegQualityForSaveData=-1&PageSpeedWebpQualityForSaveData=-1"
	SAME_QUALITY=\
	"?PageSpeedJpegQualityForSaveData=75&PageSpeedWebpQualityForSaveData=70"
	# Constants
	ACCEPT_WEBP_YES=true
	ACCEPT_WEBP_NO=false
	UNOPTIMIZED=-1

	# Allowed to vary on "Auto". Test 3 kinds of user-agents, on 3 quality levels
	# for 4 kinds of images.
	# JPEG image, optimized for Chrome on Android.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
	"Accept,Save-Data" "User-Agent,Save-Data" 33108 25774 19124 19124
	# JPEG image, optimized for Safari on iOS.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
	"Accept,Save-Data" "User-Agent,Save-Data" 73096 51452 38944 38944
	# JPEG image, optimized for Firefox on desktop.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE" \
	"$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
	"Accept,Save-Data" "User-Agent,Save-Data" 73096 73096 38944 38944
	# Photographic PNG image, optimized for Chrome on Android.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
	"Accept,Save-Data" "User-Agent,Save-Data" 2454 2014 1476 1476
	# Photographic PNG image, optimized for Safari on iOS.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
	"Accept,Save-Data" "User-Agent,Save-Data" 3536 2606 2069 2069
	# Photographic PNG image, optimized for Firefox on desktop.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_BIKE" \
	"$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/jpeg" "image/jpeg" \
	"Accept,Save-Data" "User-Agent,Save-Data" 3536 3536 2069 2069
	# Non-photographic PNG image, optimized for Chrome on Android.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/png" "image/webp" \
	"" "User-Agent" 770 694 770 694
	# Non-photographic PNG image, optimized for Safari on iOS.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/png" "image/png" \
	"" "User-Agent" 770 770 770 770
	# Non-photographic PNG image, optimized for Firefox on desktop.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_CUPPA" \
	"$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/png" "image/png" \
	"" "User-Agent" 770 770 770 770
	# Animated GIF image, optimized for Chrome on Android.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/gif" "image/webp" \
	"" "User-Agent,Save-Data" "$UNOPTIMIZED" 6490 "$UNOPTIMIZED" 4312
	# Animated GIF image, optimized for Safari on iOS.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_NO" "image/gif" "image/gif" \
	"" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"
	# Animated GIF image, optimized for Firefox on desktop.
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_ANIMATION" \
	"$FIREFOX_DESKTOP" "$ACCEPT_WEBP_NO" "image/gif" "image/gif" \
	"" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"

	# Only allow to vary on Accept, JPEG image is optimized to desktop quality.
	ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_PUZZLE" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
	"Accept" "Accept" 33108 33108 33108 33108
	# Only allow to vary on Accept, photographic PNG image is optimized to PNG and
	# Vary header is not added.
	ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_CUPPA" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_YES" "image/png" "image/png" \
	"" "" 770 770 770 770
	# Only allow to vary on Accept, animated image cannot be optimized.
	ipro_rewrite_image "$HOST_ALLOW_ACCEPT" "$IMAGE_ANIMATION" \
	"$SAFARI_MOBILE" "$ACCEPT_WEBP_YES" "image/gif" "image/gif" \
	"" "" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED" "$UNOPTIMIZED"
	# Nothing is allowed to vary on, JPEG image is optimized to desktop quality and
	# Vary header is not added.
	ipro_rewrite_image "$HOST_ALLOW_NONE" "$IMAGE_PUZZLE" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/jpeg" "image/jpeg" \
	"" "" 73096 73096 73096 73096
	# When quality for Save-Data was not set, Vary header does not include
	# "Save-Data".
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE$UNSET_QUALITY" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
	"Accept" "User-Agent" 33108 25774 33108 25774
	# When quality for Save-Data was set to the same for desktop, Vary header does
	# not include "Save-Data".
	ipro_rewrite_image "$HOST_ALLOW_AUTO" "$IMAGE_PUZZLE$SAME_QUALITY" \
	"$CHROME_MOBILE" "$ACCEPT_WEBP_YES" "image/webp" "image/webp" \
	"Accept" "User-Agent" 33108 25774 33108 25774