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+# PLACEHOLDER
+
+# Creating a New Filter
+
+Filters allow you to intercept and modify HTTP requests *before* they reach the plugin, and modify responses *before* they are sent back to the client.
+They are executed in sequence through a `FilterChain`.
+
+A filter can:
+- Inspect or modify the incoming `HttpRequest`
+- Inspect or modify the outgoing `HttpResponse`
+- Stop the chain (e.g., return a 403 or 429)
+- Allow the chain to continue by calling `chain.doFilter(req, res)`
+
+---
+
+## Filter Interface
+
+All filters must implement:
+
+```java
+public interface Filter {
+    void doFilter(HttpRequest req, HttpResponse res, FilterChain chain) throws IOException;
+}
+```
+Example: LoggingFilter
+
+## Creating a filter
+
+- Create a new class in src/main/java/.../filters/
+- Implement the Filter interface
+- Add your logic inside doFilter
+- Decide whether to continue the chain or stop it
+
+## Register your filter (src/org.example/App.java)
+
+Register your filter using:
+```
+    Pipeline pipeline = new Pipeline();
+    pipeline.addFilter(new LoggingFilter());
+```
+
+## Filter execution flow
+
+Client →
+    Filter 1 → Filter 2 → ... → Filter N →
+        Plugin → Response →
+            back through filters → Client