diff --git a/scripts/_common.sh b/scripts/_common.sh
index 1b4d782..d2e19d5 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -272,15 +272,40 @@ exec_as() {
   fi
 }
 
+#=================================================
+
 # Check if an URL is already handled
 # usage: is_url_handled URL
 is_url_handled() {
-  local output=($(curl -k -s -o /dev/null \
-      -w 'x%{redirect_url} %{http_code}' "$1"))
-  # It's handled if it does not redirect to the SSO nor return 404
-  [[ ! ${output[0]} =~ \/yunohost\/sso\/ && ${output[1]} != 404 ]]
+    # Declare an array to define the options of this helper.
+    declare -Ar args_array=( [u]=url= )
+    local url
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+
+    # Try to get the url with curl, and keep the http code and an eventual redirection url.
+    local curl_output="$(curl --insecure --silent --output /dev/null \
+      --write-out '%{http_code};%{redirect_url}' "$url")"
+
+    # Cut the output and keep only the first part to keep the http code
+    local http_code="${curl_output%%;*}"
+    # Do the same thing but keep the second part, the redirection url
+    local redirection="${curl_output#*;}"
+
+    # Return 1 if the url isn't handled.
+    # Which means either curl got a 404 (or the admin) or the sso.
+    # A handled url should redirect to a publicly accessible url.
+    # Return 1 if the url has returned 404
+    if [ "$http_code" = "404" ] || [[ $redirection =~ "/yunohost/admin" ]]; then
+        return 1
+    # Return 1 if the url is redirected to the SSO
+    elif [[ $redirection =~ "/yunohost/sso" ]]; then
+        return 1
+    fi
 }
 
+#=================================================
+
 # Make the main steps to migrate an app to its fork.
 #
 # This helper has to be used for an app which needs to migrate to a new name or a new fork
diff --git a/scripts/change_url b/scripts/change_url
index f645daf..5900652 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -100,6 +100,19 @@ then
 	ynh_replace_string "'overwrite.cli.url' => 'http://${old_domain}'," "'overwrite.cli.url' => 'https://${new_domain}'," "${final_path}/config/config.php"
 fi
 
+if [ $change_domain -eq 1 ]
+then
+	# Check if .well-known is available for this domain
+	if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+	then
+		ynh_print_warn --message="Another app already uses the domain $domain to serve a caldav/carddav feature. You may encounter issues when dealing with your calendar or address book."
+
+		# Remove lines about .well-known/carddav and caldav with sed.
+		sed --in-place --regexp-extended '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' "/etc/nginx/conf.d/$new_domain.d/$app.conf"
+		ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+	fi
+fi
+
 #=================================================
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index f1c431a..b7ad783 100755
--- a/scripts/install
+++ b/scripts/install
@@ -92,10 +92,13 @@ ynh_setup_source "$final_path"
 #=================================================
 ynh_print_info "Configuring nginx web server..."
 
-# Do not serve .well-known if it's already served on the domain
-if is_url_handled "https://$domain/.well-known/caldav" ; then
-    sed -ri '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' \
-        "../conf/nginx.conf"
+# Check if .well-known is available for this domain
+if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+then
+    ynh_print_warn --message="Another app already uses the domain $domain to serve a caldav/carddav feature. You may encounter issues when dealing with your calendar or address book."
+
+    # Remove lines about .well-known/carddav and caldav with sed.
+    sed --in-place --regexp-extended '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' "../conf/nginx.conf"
 fi
 
 # Create a dedicated nginx config
diff --git a/scripts/restore b/scripts/restore
index c3d55b1..0a28807 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -46,6 +46,15 @@ test ! -d $final_path \
 
 ynh_restore_file "/etc/nginx/conf.d/$domain.d/$app.conf"
 
+# Check if .well-known is available for this domain
+if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+then
+    ynh_print_warn --message="Another app already uses the domain $domain to serve a caldav/carddav feature. You may encounter issues when dealing with your calendar or address book."
+
+    # Remove lines about .well-known/carddav and caldav with sed.
+    sed --in-place --regexp-extended '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' "/etc/nginx/conf.d/$domain.d/$app.conf"
+fi
+
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 167bbe0..79dac00 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -123,10 +123,13 @@ ynh_backup_if_checksum_is_different "/etc/nginx/conf.d/$domain.d/$app.conf"
 ynh_remove_nginx_config
 ynh_app_setting_delete $app "checksum__etc_nginx_conf.d_$domain.d_$app.conf" || true
 
-# Do not serve .well-known if it's already served on the domain
-if is_url_handled "https://$domain/.well-known/caldav" ; then
-    sed -ri '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' \
-        "../conf/nginx.conf"
+# Check if .well-known is available for this domain
+if is_url_handled "https://$domain/.well-known/caldav" || is_url_handled "https://$domain/.well-known/carddav"
+then
+    ynh_print_warn --message="Another app already uses the domain $domain to serve a caldav/carddav feature. You may encounter issues when dealing with your calendar or address book."
+
+    # Remove lines about .well-known/carddav and caldav with sed.
+    sed --in-place --regexp-extended '/^location = \/\.well\-known\/(caldav|carddav) \{/,/\}/d' "../conf/nginx.conf"
 fi
 
 # Create a dedicated nginx config