diff --git a/.github/actions/bats/Dockerfile b/.github/actions/bats/Dockerfile
deleted file mode 100644
index 633b246..0000000
--- a/.github/actions/bats/Dockerfile
+++ /dev/null
@@ -1,3 +0,0 @@
-FROM bats/bats:latest
-
-CMD ["./tests"]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0365d62..9fc72b1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - uses: ./.github/actions/bats
+      - uses: docker://ffurrer/bats:latest
+        with:
+          args: "--recursive ."
       - uses: cycjimmy/semantic-release-action@v2
         with:
           branches: |
diff --git a/README.md b/README.md
index 7002570..4ec6ddd 100644
--- a/README.md
+++ b/README.md
@@ -6,48 +6,77 @@ This action slug and expose some github variables.
 
 `Slug` a variable will
 
-- put the variable content in lower case,
-- replace any character by `-` except `0-9` and `a-z`,
-- remove leading and trailing `-` character,
-- limit the string size to 63 characters.
+- put the variable content in lower case
+- replace any character by `-` except `0-9`, `a-z`, and `.`
+- remove leading and trailing `-` character
+- limit the string size to 63 characters
 
 Others `Slug`-ish commands are available:
 
-- `Short SHA` a variable will limit the string size to 8 characters.
+- `Slug URL` a variable will be like the `slug` variable but the `.` character will also be replaced by `-`
+- `Short SHA` a variable will limit the string size to 8 characters
 
 ## Exposed environment variables
 
 ```yaml
-- uses: rlespinasse/github-slug-action@v2.x
-- name: Print slug variables
+- name: Inject slug/short variables
+  uses: rlespinasse/github-slug-action@v2.x
+
+- name: Print slug/short variables
   run: |
-    echo ${{ env.GITHUB_REF_SLUG }}
-    echo ${{ env.GITHUB_HEAD_REF_SLUG }}
-    echo ${{ env.GITHUB_BASE_REF_SLUG }}
-    echo ${{ env.GITHUB_SHA_SHORT }}
+    echo "Slug reference variables"
+    echo " - ${{ env.GITHUB_REF_SLUG }}"
+    echo " - ${{ env.GITHUB_HEAD_REF_SLUG }}"
+    echo " - ${{ env.GITHUB_BASE_REF_SLUG }}"
+    echo "Slug URL reference variables"
+    echo " - ${{ env.GITHUB_REF_SLUG_URL }}"
+    echo " - ${{ env.GITHUB_HEAD_REF_SLUG_URL }}"
+    echo " - ${{ env.GITHUB_BASE_REF_SLUG_URL }}"
+    echo "Short SHA variables"
+    echo " - ${{ env.GITHUB_SHA_SHORT }}"
 ```
 
 Read [default environment variables](https://help.github.com/en/actions/configuring-and-managing-workflows/using-environment-variables#default-environment-variables) page for more information.
 
-### GITHUB_REF_SLUG
+### GITHUB_REF_SLUG(_URL)
 
 Slug the environment variable **GITHUB_REF**
 
 The branch or tag ref that triggered the workflow.
 _If neither a branch or tag is available for the event type, the variable will not exist._
 
-| Environment variable (GITHUB_REF) | Slug variable (GITHUB_REF_SLUG) |
-|-----------------------------------|---------------------------------|
-| refs/heads/master                 | master                          |
-| refs/heads/feat/new_feature       | feat-new-feature                |
-| refs/tags/v1.0.0                  | v1-0-0                          |
-| refs/tags/product@1.0.0-rc.2      | product-1-0-0-rc-2              |
-| refs/heads/New_Awesome_Product    | new-awesome-product             |
+| GITHUB_REF                     | GITHUB_REF_SLUG     | GITHUB_REF_SLUG_URL |
+|--------------------------------|---------------------|---------------------|
+| refs/heads/master              | master              | master              |
+| refs/heads/feat/new_feature    | feat-new-feature    | feat-new-feature    |
+| refs/tags/v1.0.0               | v1.0.0              | v1-0-0              |
+| refs/tags/product@1.0.0-rc.2   | product-1.0.0-rc.2  | product-1-0-0-rc-2  |
+| refs/heads/New_Awesome_Product | new-awesome-product | new-awesome-product |
 
 _Additional variables (only set for forked repositories) :_
 
-- `GITHUB_HEAD_REF_SLUG` : The branch of the head repository **GITHUB_HEAD_REF**,
-- `GITHUB_BASE_REF_SLUG` : The branch of the base repository **GITHUB_BASE_REF**.
+- `GITHUB_HEAD_REF_SLUG`/`GITHUB_HEAD_REF_SLUG_URL`, The branch of the head repository **GITHUB_HEAD_REF**
+- `GITHUB_BASE_REF_SLUG`/`GITHUB_BASE_REF_SLUG_URL`, The branch of the base repository **GITHUB_BASE_REF**
+
+#### Use in an URL
+
+In an URL, use `GITHUB_REF_SLUG_URL` instead of **GITHUB_REF_SLUG** as subdomain to be compliant.
+
+> **NOTE :**
+> GITHUB_REF_SLUG can be used in an URL only as part of the _resource path_.
+
+```yaml
+- name: Inject slug/short variables
+  uses: rlespinasse/github-slug-action@v2.x
+
+- name: Deploy dummy application using slug in the 'subdomain' part
+  run: |
+    ./deploy-application.sh --url "https://${{ env.GITHUB_REF_SLUG_URL }}.staging.app.mycompagny.com"
+
+- name: Deploy dummy application using slug in the 'resource path' part
+  run: |
+    ./deploy-application.sh --url "https://staging.app.mycompagny.com/${{ env.GITHUB_REF_SLUG }}"
+```
 
 ### GITHUB_SHA_SHORT
 
@@ -55,6 +84,6 @@ Short the environment variable **GITHUB_SHA**
 
 The commit SHA that triggered the workflow
 
-| Environment variable (GITHUB_SHA)        | Short variable (GITHUB_SHA_SHORT) |
-|------------------------------------------|-----------------------------------|
-| ffac537e6cbbf934b08745a378932722df287a53 | ffac537e                          |
+| GITHUB_SHA                               | GITHUB_SHA_SHORT |
+|------------------------------------------|------------------|
+| ffac537e6cbbf934b08745a378932722df287a53 | ffac537e         |
diff --git a/entrypoint.sh b/entrypoint.sh
index 3d5d021..5902707 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,6 +1,13 @@
 #!/bin/sh -l
 
 slug_ref() {
+  echo "$1" |
+    tr "[:upper:]" "[:lower:]" |
+    sed -r 's#refs/[^\/]*/##;s/[~\^]+//g;s/[^a-zA-Z0-9.]+/-/g;s/^-+\|-+$//g;s/^-*//;s/-*$//' |
+    cut -c1-63
+}
+
+slug_url_ref() {
   echo "$1" |
     tr "[:upper:]" "[:lower:]" |
     sed -r 's#refs/[^\/]*/##;s/[~\^]+//g;s/[^a-zA-Z0-9]+/-/g;s/^-+\|-+$//g;s/^-*//;s/-*$//' |
@@ -15,4 +22,9 @@ short_sha() {
 echo ::set-env name=GITHUB_REF_SLUG::"$(slug_ref "$GITHUB_REF")"
 echo ::set-env name=GITHUB_HEAD_REF_SLUG::"$(slug_ref "$GITHUB_HEAD_REF")"
 echo ::set-env name=GITHUB_BASE_REF_SLUG::"$(slug_ref "$GITHUB_BASE_REF")"
+
+echo ::set-env name=GITHUB_REF_SLUG_URL::"$(slug_url_ref "$GITHUB_REF")"
+echo ::set-env name=GITHUB_HEAD_REF_SLUG_URL::"$(slug_url_ref "$GITHUB_HEAD_REF")"
+echo ::set-env name=GITHUB_BASE_REF_SLUG_URL::"$(slug_url_ref "$GITHUB_BASE_REF")"
+
 echo ::set-env name=GITHUB_SHA_SHORT::"$(short_sha "$GITHUB_SHA")"
diff --git a/package.json b/package.json
index 5fa0cb3..d9491ad 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "1.1.0",
   "license": "MIT",
   "scripts": {
-    "test": "docker run -w /workdir -v $(pwd):/workdir bats/bats:latest ./tests",
+    "test": "docker run -w /workdir -v $(pwd):/workdir ffurrer/bats:latest --recursive .",
     "release": "semantic-release"
   },
   "repository": {
diff --git a/tests/short_sha.bats b/tests/short_sha.bats
index dd5d0f7..3dd11c9 100644
--- a/tests/short_sha.bats
+++ b/tests/short_sha.bats
@@ -1,6 +1,6 @@
 #!/usr/bin/env bats
 
-@test "Short long hash" {
+@test "short_sha: long hash" {
   test_short_sha \
     "a35a1a486a260cfd99c5b6f8c6034a2929ba9b3f" \
     "a35a1a48"
diff --git a/tests/slug_ref.bats b/tests/slug_ref.bats
index 89cdc1b..3994835 100644
--- a/tests/slug_ref.bats
+++ b/tests/slug_ref.bats
@@ -1,43 +1,43 @@
 #!/usr/bin/env bats
 
-@test "Slug master branch" {
-  test_sluf_ref \
+@test "slug_ref:: master branch" {
+  test_slug_ref \
     "refs/heads/master" \
     "master"
 }
 
-@test "Slug a feature branch" {
-  test_sluf_ref \
+@test "slug_ref: a feature branch" {
+  test_slug_ref \
     "refs/heads/feat/new_feature" \
     "feat-new-feature"
 }
 
-@test "Slug a fix branch" {
-  test_sluf_ref \
+@test "slug_ref: a fix branch" {
+  test_slug_ref \
     "refs/heads/fix/issue_number" \
     "fix-issue-number"
 }
 
-@test "Slug a simple tag" {
-  test_sluf_ref \
+@test "slug_ref: a simple tag" {
+  test_slug_ref \
     "refs/tags/v1.0.0" \
-    "v1-0-0"
+    "v1.0.0"
 }
 
-@test "Slug a complex tag" {
-  test_sluf_ref \
+@test "slug_ref: a complex tag" {
+  test_slug_ref \
     "refs/tags/product@1.0.0-rc.2" \
-    "product-1-0-0-rc-2"
+    "product-1.0.0-rc.2"
 }
 
-@test "Slug a reference with upper case letters" {
-  test_sluf_ref \
+@test "slug_ref: a reference with upper case letters" {
+  test_slug_ref \
     "refs/heads/New_Awesome_Product" \
     "new-awesome-product"
 }
 
-@test "Slug a very long name" {
-  test_sluf_ref \
+@test "slug_ref: a very long name" {
+  test_slug_ref \
     "refs/heads/an-awesome-Feature-Very-Very-Very-Very-Very-Very-Very-Long-moreThan63Characters" \
     "an-awesome-feature-very-very-very-very-very-very-very-long-more"
 }
@@ -45,7 +45,7 @@
 # Load sluf_ref function
 source entrypoint.sh > /dev/null 2>&1
 
-test_sluf_ref() {
+test_slug_ref() {
   given="${1}"
   expected="${2}"
 
diff --git a/tests/slug_url_ref.bats b/tests/slug_url_ref.bats
new file mode 100644
index 0000000..991736c
--- /dev/null
+++ b/tests/slug_url_ref.bats
@@ -0,0 +1,55 @@
+#!/usr/bin/env bats
+
+@test "slug_url_ref: master branch" {
+  test_slug_url_ref \
+    "refs/heads/master" \
+    "master"
+}
+
+@test "slug_url_ref: a feature branch" {
+  test_slug_url_ref \
+    "refs/heads/feat/new_feature" \
+    "feat-new-feature"
+}
+
+@test "slug_url_ref: a fix branch" {
+  test_slug_url_ref \
+    "refs/heads/fix/issue_number" \
+    "fix-issue-number"
+}
+
+@test "slug_url_ref: a simple tag" {
+  test_slug_url_ref \
+    "refs/tags/v1.0.0" \
+    "v1-0-0"
+}
+
+@test "slug_url_ref: a complex tag" {
+  test_slug_url_ref \
+    "refs/tags/product@1.0.0-rc.2" \
+    "product-1-0-0-rc-2"
+}
+
+@test "slug_url_ref: a reference with upper case letters" {
+  test_slug_url_ref \
+    "refs/heads/New_Awesome_Product" \
+    "new-awesome-product"
+}
+
+@test "slug_url_ref: a very long name" {
+  test_slug_url_ref \
+    "refs/heads/an-awesome-Feature-Very-Very-Very-Very-Very-Very-Very-Long-moreThan63Characters" \
+    "an-awesome-feature-very-very-very-very-very-very-very-long-more"
+}
+
+# Load sluf_ref function
+source entrypoint.sh > /dev/null 2>&1
+
+test_slug_url_ref() {
+  given="${1}"
+  expected="${2}"
+
+  actual="$(slug_url_ref \"${given}\")"
+  echo "expected : [${expected}], actual : [${actual}]"
+  [ "${actual}" == "${expected}" ]
+}