add GET method for shortening

README.md

@@ -124,8 +124,8 @@ Health check endpoint.
 
 ---
 
-### `POST /api/shorten`
-Create a new short URL. No API key required.
+### `POST / GET /api/shorten`
+Create a new short URL (supports both `POST` and `GET`). No API key required.
 
 Fields can be passed as **query parameters** (URL-encoded) or in a **JSON request body**.
 Query parameters take precedence over body fields.
@@ -217,14 +217,17 @@ Increments `visit_count` on each hit.
 ## Example with `curl`
 
 ```bash
-# Shorten a URL (JSON body)
+# Shorten a URL (POST with JSON body)
 curl -X POST http://localhost:8080/s/api/shorten \
      -H "Content-Type: application/json" \
      -d '{"url": "https://github.com"}'
 
-# Shorten a URL (query parameters)
+# Shorten a URL (POST with query parameters)
 curl -X POST "http://localhost:8080/s/api/shorten?url=https%3A%2F%2Fgithub.com&retention_days=30"
 
+# Shorten a URL (GET with query parameters)
+curl "http://localhost:8080/s/api/shorten?url=https%3A%2F%2Fgithub.com"
+
 # Follow the redirect
 curl -L http://localhost:8080/s/aB3xYz