diff --git a/config/config.sh b/config/config.sh
index 780a55d..8004b77 100755
--- a/config/config.sh
+++ b/config/config.sh
@@ -14,3 +14,7 @@ PACFILE_NOSSL="result/proxy-host-nossl.pac"
 
 # Perform DNS resolving to detect and filter non-existent domains
 RESOLVE_NXDOMAIN="no"
+
+# Perform HTTP (port 80)/HTTPS (port 443) reachability test with curl,
+# to detect and filter broken websites
+TEST_WEB_AVAILABILITY="no"
diff --git a/parse.sh b/parse.sh
index 68b656e..3075c35 100755
--- a/parse.sh
+++ b/parse.sh
@@ -31,6 +31,13 @@ then
     awk -f scripts/getzones.awk temp/hostlist_original_with_include.txt | grep -v -F -x -f temp/exclude-hosts.txt | cat - temp/include-hosts.txt | sort -u > result/hostlist_zones.txt
 fi
 
+if [[ "$TEST_WEB_AVAILABILITY" == "yes" ]];
+then
+    timeout 2h parallel --bar -j96 -n1 -a result/hostlist_zones.txt scripts/test-with-curl.sh > temp/web-unreachable-exclude-hosts.txt || true
+    cat temp/web-unreachable-exclude-hosts.txt >> temp/exclude-hosts.txt
+    awk -f scripts/getzones.awk temp/hostlist_original_with_include.txt | grep -v -F -x -f temp/exclude-hosts.txt | cat - temp/include-hosts.txt | sort -u > result/hostlist_zones.txt
+fi
+
 # Generate a list of IP addresses
 awk -F';' '$1 ~ /\// {print $1}' temp/list.csv | grep -P '([0-9]{1,3}\.){3}[0-9]{1,3}\/[0-9]{1,2}' -o | sort -Vu > result/iplist_special_range.txt
 
diff --git a/scripts/test-with-curl.sh b/scripts/test-with-curl.sh
new file mode 100755
index 0000000..3f67265
--- /dev/null
+++ b/scripts/test-with-curl.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+function curl_open() {
+    local WEBSITE="$1"
+
+    curl --max-time 10 --compressed --fail --fail-early \
+         -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0 antizapret.prostovpn.org anti-censorship tester' \
+         "http://$WEBSITE" &> /dev/null
+    RESULT_HTTP="$?"
+    curl --max-time 10 --compressed --fail --fail-early \
+         -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0 antizapret.prostovpn.org anti-censorship tester' \
+         -k "https://$WEBSITE" &> /dev/null
+    RESULT_HTTPS="$?"
+
+    if [ "$RESULT_HTTP" -ne 0 ] && [ "$RESULT_HTTPS" -ne 0 ]; then
+        # If both HTTP and HTTPS failed, the website doesn't work
+        return 1
+    fi
+    return 0
+}
+
+WEBSITE="$1"
+curl_open "$WEBSITE"
+ERRCODE="$?"
+if [ "$ERRCODE" -ne 0 ]; then
+    #echo "$WEBSITE does not respond, marking as failed, not adding to the PAC list"
+    echo "$WEBSITE"
+fi
+exit $ERRCODE