diff --git a/api/gitlab-bash-api.sh b/api/gitlab-bash-api.sh
index 061da21..4982cdf 100644
--- a/api/gitlab-bash-api.sh
+++ b/api/gitlab-bash-api.sh
@@ -10,14 +10,12 @@
 #
 # Last version is available on GitHub: https://github.com/cClaude/gitlab-bash-api
 #
-declare LF
-LF="
-"
-declare -r LF
+chr() {
+  printf \\$(printf '%03o' $1)
+}
 
-declare CR
-CR="$(echo -e "\r")"
-declare -r CR
+declare -r LF=$(chr "10")
+declare -r CR=$(chr "13")
 
 NEXT_PAGE='*'
 
@@ -32,7 +30,7 @@ function gitlab_get_page {
   local curl_url="${GITLAB_URL_PREFIX}/api/${GITLAB_API_VERSION}/${api_url}?page=${page}&per_page=${PER_PAGE_MAX}&${api_params}"
   local curl_result
 
-  curl_result=$(curl --include --silent --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" "${curl_url}")
+  curl_result=$(curl --include --silent --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" "${curl_url}" ${client_certificate})
   local curl_rc=$?
 
   if [ $curl_rc -ne 0 ]; then
@@ -110,7 +108,7 @@ function gitlab_post {
   local curl_url="${GITLAB_URL_PREFIX}/api/${GITLAB_API_VERSION}/${api_url}?per_page=${PER_PAGE_MAX}&${api_params}"
   local curl_result
 
-  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X POST --silent "${curl_url}")
+  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X POST --silent "${curl_url}" ${client_certificate})
   local curl_rc=$?
 
   if [ $curl_rc -ne 0 ]; then
@@ -131,7 +129,7 @@ function gitlab_put {
   local curl_url="${GITLAB_URL_PREFIX}/api/${GITLAB_API_VERSION}/${api_url}?per_page=${PER_PAGE_MAX}&${api_params}"
   local curl_result
 
-  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X PUT --silent "${curl_url}")
+  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X PUT --silent "${curl_url}" ${client_certificate})
   local curl_rc=$?
 
   if [ $curl_rc -ne 0 ]; then
@@ -152,7 +150,7 @@ function gitlab_delete {
   local curl_url="${GITLAB_URL_PREFIX}/api/${GITLAB_API_VERSION}/${api_url}?per_page=${PER_PAGE_MAX}&${api_params}"
   local curl_result
 
-  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X DELETE --silent "${curl_url}")
+  curl_result=$(curl --header "PRIVATE-TOKEN: ${GITLAB_PRIVATE_TOKEN}" -X DELETE --silent "${curl_url}" ${client_certificate})
   local curl_rc=$?
 
   if [ $curl_rc -ne 0 ]; then
@@ -398,3 +396,14 @@ if [ -z "${PER_PAGE_MAX}" ]; then
   # Max value for GitLab is 100
   PER_PAGE_MAX=50
 fi
+
+#prepare client_certificate part of CURL
+if [ -n ${GITLAB_CLIENT_CERTIFICATE} ]; then
+  client_certificate=" --cert ${GITLAB_CLIENT_CERTIFICATE}"
+  if [ ! -n ${GITLAB_CLIENT_CERTIFICATE_PASSWORD} ]; then
+    client_certificate+=":${GITLAB_CLIENT_CERTIFICATE_PASSWORD}"
+  fi
+  client_certificate+=" --key ${GITLAB_PRIVATE_KEY}"
+else
+  client_certificate=""
+fi
diff --git a/custom-config-sample/my-secrets-configuration.sh b/custom-config-sample/my-secrets-configuration.sh
index 85cb98d..2c404dd 100644
--- a/custom-config-sample/my-secrets-configuration.sh
+++ b/custom-config-sample/my-secrets-configuration.sh
@@ -11,3 +11,8 @@ GITLAB_PRIVATE_TOKEN=__YOUR_GITLAB_TOKEN_HERE__
 #GITLAB_USER=__YOUR_GIT_USER__
 #GITLAB_PASSWORD=$(url_encode '__YOUR_GIT_USER_PASSWORD__')
 #GITLAB_CLONE_HTTP_PREFIX="https://${GITLAB_USER}:${GITLAB_PASSWORD}@${GITLAB_URL_PREFIX#"https://"}"
+
+# If client certificate is needed for HTTPS communication with GitLab server
+#GITLAB_CLIENT_CERTIFICATE=__PATH_TO_YOUR_CLIENT_CERTIFICATE__
+#GITLAB_CLIENT_CERTIFICATE_PASSWORD=__PASSWORD_FOR_YOUR_CLIENT_CERTIFICATE__
+#GITLAB_PRIVATE_KEY=__PATH_TO_YOUR_PRIVATE_KEY__