diff --git a/action.yaml b/action.yaml
index be096cc..b0a8616 100644
--- a/action.yaml
+++ b/action.yaml
@@ -7,6 +7,9 @@ inputs:
   registry:
     description: URL to the container registry
     required: true
+  insecure-registry:
+    description: If "true", will use HTTP rather than HTTPS
+    required: false
   image:
     description: The name of the image in the registry
     required: true
diff --git a/index.js b/index.js
index a86bc8d..af6bfb5 100644
--- a/index.js
+++ b/index.js
@@ -14,6 +14,8 @@ async function main() {
 	try {
 		const input = {
 			registry: core.getInput('registry'),
+			registry_url: null,
+			insecure_registry: core.getInput('insecure-registry') === 'true',
 			image: core.getInput('image'),
 			old_tag: core.getInput('old-tag'),
 			new_tags: core.getInput('new-tags').trim().split('\n'),
@@ -22,12 +24,13 @@ async function main() {
 			token: null,
 		};
 
+		input.registry_url = `http${input.insecure_registry ? '' : 's'}://${input.registry}`;
 		console.log('Tagging %s/%s:%s with new tags', input.registry, input.image, input.old_tag, input.new_tags);
 
-		const manifest = await get_manifest(`${input.registry}/v2/${input.image}/manifests/${input.old_tag}`);
+		const manifest = await get_manifest(input);
 
 		const promises = input.new_tags.map((new_tag) => {
-			return put_manifest(`${input.registry}/v2/${input.image}/manifests/${new_tag}`, manifest);
+			return put_manifest(new_tag, manifest, input);
 		});
 
 		await Promise.all(promises);
@@ -39,17 +42,18 @@ async function main() {
 	}
 }
 
-async function get_manifest(url_str, input) {
-	let { status, headers, body } = await http_req('GET', url_str, {
+async function get_manifest(input) {
+	const path = `/v2/${input.image}/manifests/${input.old_tag}`;
+	let { status, headers, body } = await http_req('GET', input.registry_url + path, {
 		accept: manifest_media_type,
 	});
 
 	if (status === 401 && headers['www-authenticate']) {
 		await get_token(headers['www-authenticate'], input);
 		
-		({ status, headers, body } = await http_req('GET', url_str, {
+		({ status, headers, body } = await http_req(input.insecure_registry, 'GET', input.registry_url + path, {
 			accept: manifest_media_type,
-			authorization: `Bearer ${token}`,
+			authorization: `Bearer ${input.token}`,
 		}));
 	}
 
@@ -61,16 +65,17 @@ async function get_manifest(url_str, input) {
 	return body;
 }
 
-async function put_manifest(url_str, manifest) {
+async function put_manifest(new_tag, manifest, input) {
+	const path = `/v2/${input.image}/manifests/${new_tag}`;
 	const req_headers = {
 		'content-type': manifest_media_type,
 	};
 
 	if (token) {
-		req_headers.authorization = `Bearer ${token}`;
+		req_headers.authorization = `Bearer ${input.token}`;
 	}
 
-	const { status, headers, body } = await http_req('PUT', url_str, req_headers, manifest);
+	const { status, headers, body } = await http_req('PUT', input.registry_url + path, req_headers, manifest);
 
 	if (status >= 400) {
 		console.error('get manifest response', { status, headers, body });
diff --git a/readme.md b/readme.md
index ef78f21..068fcd6 100644
--- a/readme.md
+++ b/readme.md
@@ -15,9 +15,10 @@ jobs:
     - name: Tag the "gitea.example.com/owner/package:latest" image with some new tags
       uses: https://gitea.jbrumond.me/actions/docker-tag@v0.1
       with:
-        registry: https://gitea.example.com
+        registry: gitea.example.com
         username: ${{ secrets.REGISTRY_USERNAME }}
         password: ${{ secrets.REGISTRY_PASSWORD }}
+        insecure-registry: false
         image: owner/package
         old-tag: latest
         new-tags: |