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+---
+type: docs
+linkTitle: Otoroshi Advanced Features
+title: Otoroshi Advanced Features Guide
+description: Configure and use Otoroshi advanced features including WAF, Reverse Proxy, Rate Limiting, and Canary Deployments with detailed tutorials and best practices
+keywords:
+- otoroshi
+- api gateway
+- waf
+- reverse proxy
+- canary deployment
+- rate limiting
+- load balancing
+---
+
+Otoroshi is a modern API Gateway that provides powerful features to secure, manage, and optimize your services. 
+
+This guide covers the main features tested and validated for deployment on Clever Cloud.
+
+---
+
+## WAF (Web Application Firewall)
+
+Otoroshi integrates **Coraza**, an open-source WAF compatible with ModSecurity rules and compliant with OWASP recommendations. It filters and blocks malicious requests before they reach your applications.
+
+### Configuration
+
+#### Step 1: Create a WAF Item
+
+1. Navigate to **Categories → WAF → WAF Config**
+2. Click **Add item**
+3. Add your security directives
+
+#### Example Directives
+
+```
+SecRuleEngine On 
+SecRule REQUEST_HEADERS:X-Forwarded-For "@rx <IPV4>" "id:1001,deny,status:403,log,msg:'IP bloquee'"
+```
+
+**Directive Explanations:**
+
+- **`SecRuleEngine On`** : Enables the Coraza rules engine. Without this directive, no rules are evaluated
+- **`SecRule REQUEST_HEADERS:X-Forwarded-For`** : Rule applied in phase 1 (header analysis) that reads the real client IP from the `X-Forwarded-For` header, required because requests go through Clever Cloud load balancers
+- **`@rx <IPV4>`** : Regex operator that matches the header value against the provided IPv4 address
+- **`id:1001`** : Mandatory unique identifier for the rule
+- **`phase:1`** : Evaluation during the header analysis phase, before request body processing
+- **`deny`** : Disruptive action that rejects the request
+- **`status:403`** : HTTP status code returned to the blocked client
+- **`log`** : Records the event in the logs
+- **`msg:'IP blocked'`** : Message associated with the event in the logs
+
+**Further Reading:**
+- 📖 [Coraza SecLang Documentation](https://coraza.io/docs/seclang/) — Full reference for all directives, operators, variables and actions
+- 🛡️ [OWASP Core Rule Set with Coraza](https://coraza.io/docs/tutorials/coreruleset/) — How to enable and configure the OWASP CRS for broader WAF protection
+
+{{< callout type="warning" >}}
+**Important** : Each directive must be on a **separate line** in the directives field. Mixing multiple directives in a single entry will cause a WASM runtime crash and may lead to Out of Memory errors on your Otoroshi instance.
+{{< /callout >}}
+
+{{< callout type="info" >}}
+**Note** : Using `REQUEST_HEADERS:X-Forwarded-For` instead of `REMOTE_ADDR` is mandatory behind a load balancer. `REMOTE_ADDR` would contain the load balancer's IP address instead of the real client IP.
+
+Additionally, **IPv4 addresses are required**. IPv6 addresses are not reliably supported by the Coraza WASM module embedded in Otoroshi. Use `curl -4 ifconfig.io` to retrieve your IPv4 address.
+{{< /callout >}}
+
+#### Step 2: Create and Configure a Route
+
+1. Navigate to **Shortcuts → Routes → Create new route**
+2. Configure the **Frontend** (public entry point):
+   - Public URL used by your clients (set on Otoroshi addon)
+3. Configure the **Backend** (actual service):
+   - Internal URL of your application that will process requests (set on your application)
+4. Add the **WAF** in the "Plugins" section
+
+{{< callout type="info" >}}
+The frontend DNS must point to Otoroshi, not directly to your application. The backend URL is used by Otoroshi to proxy requests after applying WAF rules.
+{{< /callout >}}
+
+---
+
+## Reverse Proxy
+
+### Overview
+
+Otoroshi natively supports multiple protocols:
+
+- **HTTP/HTTPS**: Standard web requests
+- **TCP**: Raw TCP connections (databases, custom services)
+- **gRPC**: Modern RPC protocol based on HTTP/2
+
+### Configuring a Simple Reverse Proxy
+
+Otoroshi's versatile protocol support allows it to act as a reverse proxy for various types of services:
+
+1. **Create a route** in Otoroshi
+2. **Configure the Frontend**:
+   - Public hostname, port, and path (set on Otoroshi addon)
+3. **Configure the Backend**:
+   - IP + port or URL of your actual service (set on your application)
+
+Otoroshi intercepts incoming requests, applies your rules (security, rate limiting, etc.), and forwards them to the backend.
+
+**Use Cases:**
+- Proxy HTTP/HTTPS requests to web applications
+- Forward TCP connections to databases or custom services
+- Route gRPC calls to microservices
+
+### Frontend vs Backend
+
+**Frontend**: The public entry point that clients use to access your service. This is the URL your users will call.
+
+**Backend**: The actual internal address of your application/service that processes requests. Otoroshi proxies requests to this address after filtering through WAF and other plugins.
+
+{{< callout type="info" >}}
+Your DNS must point the frontend domain to Otoroshi, not to your backend application. The backend URL is used internally by Otoroshi to forward filtered traffic.
+{{< /callout >}}
+
+---
+
+## Rate Limiting & Custom Quotas
+
+### Overview
+
+Rate limiting protects your services from abuse by controlling the number of requests allowed per time period. Otoroshi provides flexible quota management based on various criteria.
+
+### Implementation
+
+To limit the number of requests per IP or per user:
+
+1. Navigate to your route's configuration
+2. Add the **"Custom quotas"** plugin in the "Plugins" section
+3. Configure the following parameters:
+   - **Quota**: Number of authorized requests
+   - **Period**: Time window (per second, minute, hour, day)
+   - **Criteria**: IP address, API key, user, etc.
+
+**Common Use Cases:**
+- Protect your APIs against abuse and brute force attacks
+- Manage differentiated quotas for commercial tiers
+- Mitigate DDoS attempts
+- Implement fair usage policies (free vs paid tiers)
+
+### Configuration Example
+
+```json
+{
+  "throttling_quota": "1000",
+  "throttling_period": "3600",
+  "throttling_by": "ip"
+}
+```
+
+This configuration allows **1000 requests per hour per IP address**.
+
+### Additional Options
+
+You can customize rate limiting based on:
+- **IP address**: Limit per visitor
+- **API key**: Different quotas per client
+- **User**: Authenticated user limits
+- **Custom header**: Advanced filtering
+
+---
+
+## Canary Deployments
+
+Canary mode allows you to test a new version of your application on a percentage of traffic before a complete deployment. This technique reduces risk by gradually exposing new code to production users.
+
+### Method 1: Route-Level Configuration with Plugin (Recommended)
+
+This method provides more granular control and is easier to configure for single routes.
+
+#### Configuration Steps
+
+1. **Create a new route**
+2. **Select the "Canary Mode" plugin**
+3. **Configure the following parameters**:
+    - **Frontend**: Public URL (set on Otoroshi addon)
+    - **Canary mode**:
+        - **Traffic**: 0.2 for 20% redirection to canary (or 0.5 for 50%)
+        - **Targets**:
+            - Hostname: `app-canary.cleverapps.io`
+            - Port: `443`
+            - Weight: `1`
+    - **Backend**: Stable application URL (e.g., `app-stable.cleverapps.io`)
+
+#### Complete Test Script
+
+```sh
+#!/bin/bash
+
+echo "=== Otoroshi Canary Mode Test ==="
+echo "Date: $(date)"
+echo ""
+
+STABLE=0
+CANARY=0
+UNKNOWN=0
+
+# Replace with your actual Otoroshi frontend URL
+FRONTEND_URL="http://myapp.mydomain.com"
+
+for i in {1..100}; do
+  RESPONSE=$(curl -L -s "$FRONTEND_URL")
+
+  if echo "$RESPONSE" | grep -q "STABLE"; then
+    ((STABLE++))
+  elif echo "$RESPONSE" | grep -q "CANARY"; then
+    ((CANARY++))
+  else
+    ((UNKNOWN++))
+  fi
+
+  echo -n "."
+done
+
+echo ""
+echo ""
+echo "Results over 100 requests:"
+echo "  → Stable: $STABLE"
+echo "  → Canary: $CANARY"
+echo "  → Unknown: $UNKNOWN"
+echo ""
+
+PERCENT_CANARY=$((CANARY))
+echo "Canary rate: ${PERCENT_CANARY}%"
+```
+
+#### Expected Results
+
+- Traffic at **0.2** (20%): ~20% to CANARY, ~80% to STABLE
+- Traffic at **0.5** (50%): ~50% to CANARY, ~50% to STABLE
+
+{{< callout type="warning" >}}
+Always monitor error rates and latency when testing canary deployments. Start with a low percentage (5-10%) and gradually increase if metrics remain healthy.
+{{< /callout >}}
+
+---
+
+### Method 2: Service-Level Configuration
+
+This method is useful for managing multiple routes with the same canary configuration.
+
+#### Configuration Steps
+
+1. **Create a new Service**:
+    ```
+    Name: "My Service"
+    Description: "Service with Canary"
+    ```
+
+2. **Service Exposition Settings**:
+    ```
+    Exposed domain: myapp.mydomain.com
+    Legacy domain: true
+    Strip path: true
+    ```
+
+3. **Service Targets**:
+    ```
+    Load balancing: WeightBestResponseTime
+    Weight ratio: 0.2
+
+    Target 1: app-stable.cleverapps.io (STABLE)
+    Target 2: app-canary.cleverapps.io (CANARY)
+    ```
+
+4. **URL Patterns**:
+    ```
+    Public patterns: "/.*"
+    ```
+
+#### Testing
+
+```sh
+# Replace with your actual frontend URL
+out=$(for i in {1..200}; do curl -s https://myapp.mydomain.com | grep Version; done); 
+echo "CANARY: $(echo "$out" | grep -c CANARY)"
+echo "STABLE: $(echo "$out" | grep -c STABLE)"
+```
+
+Expected Result: ~40 requests to CANARY, ~160 to STABLE (20/80 ratio)
+{{< callout type=“info” >}}
+Traffic Flow: Client → your-domain.com → Otoroshi → { stable / canary }
+{{< /callout >}}
+
+### Load Balancing Strategies
+
+When using canary deployments, you can choose from several load balancing algorithms:
+- WeightBestResponseTime: Routes traffic based on response time and weights
+- RoundRobin: Distributes requests evenly across targets
+- Random: Randomly selects a target for each request
+- IpAddressHash: Routes based on client IP (sticky sessions)
+
+---
+## Resources
+
+- Official Otoroshi Documentation : https://maif.github.io/otoroshi/
+- Clever Cloud Documentation : https://www.clever.cloud/developers/doc/
+- OWASP ModSecurity Core Rule Set : https://owasp.org/www-project-modsecurity-core-rule-set/
+- Coraza WAF Documentation : https://coraza.io/
+- API Gateway Patterns : https://microservices.io/patterns/apigateway.html
+