Initial commit

Dockerfile

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+FROM nginx:alpine
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/nginx.conf
+
+# Create cache directory
+RUN mkdir -p /var/cache/nginx && \
+    chown nginx:nginx /var/cache/nginx
+
+# Expose port
+EXPOSE 3000
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]

README.md

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+# Nginx Cache Proxy
+
+An nginx proxy server that caches requests only when explicitly requested via the `X-Cache: 1` header.
+
+## Configuration
+
+The nginx configuration implements an inverted caching logic:
+- **Default behavior**: Requests are NOT cached
+- **Cached behavior**: Only requests with `X-Cache: 1` header are cached
+
+## Usage
+
+```bash
+# Normal request - NOT cached (default)
+curl http://localhost:3000/?url=https://api.example.com/data
+
+# Cached request - add the header
+curl -H "X-Cache: 1" http://localhost:3000/?url=https://api.example.com/data
+```
+
+## Features
+
+- Cache path: `/var/cache/nginx`
+- Cache zone: `api_cache` (10MB)
+- Max cache size: 1GB
+- Cache validity: 365 days for 200 responses
+- Cache key: Based on scheme, host, URI, and query parameters
+- Cache status header: `X-Cache-Status` shows cache hit/miss status
+
+## In n8n
+
+Add the `X-Cache: 1` header only to requests you want cached. All other requests will bypass the cache completely.

build.sh

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+#!/bin/bash
+ 
+# ============================================================================
+# CONFIGURATION - Modify these for your project
+# ============================================================================
+ 
+# Docker registry and image name
+DOCKER_REPO="docker.site.quack-lab.dev"
+IMAGE_NAME="nginx-cache-proxy"
+ 
+# ============================================================================
+# VALIDATE CONFIGURATION
+# ============================================================================
+
+echo "Validating nginx configuration..."
+nginx -t -c /dev/stdin <<< "$(cat nginx.conf)"
+
+if [ $? -ne 0 ]; then
+    echo "Error validating nginx configuration"
+    exit 1
+fi
+
+# ============================================================================
+# DOCKER BUILD AND TAG
+# ============================================================================
+ 
+COMMIT_SHA=$(git rev-parse --short HEAD)
+IMAGE_BASE="${DOCKER_REPO}/${IMAGE_NAME}"
+ 
+echo ""
+echo "Building Docker image..."
+docker build -t "${IMAGE_BASE}:${COMMIT_SHA}" .
+ 
+if [ $? -ne 0 ]; then
+    echo "Error building agx Docker image"
+    exit 1
+fi
+ 
+echo "Tagging as latest..."
+docker tag "${IMAGE_BASE}:${COMMIT_SHA}" "${IMAGE_BASE}:latest"
+ 
+TAGS=$(git tag --points-at HEAD)
+if [ -n "$TAGS" ]; then
+    echo "Found tags on current commit:"
+    while IFS= read -r tag; do
+        if [ -n "$tag" ]; then
+            echo "Tagging as ${tag}..."
+            docker tag "${IMAGE_BASE}:${COMMIT_SHA}" "${IMAGE_BASE}:${tag}"
+        fi
+    done <<< "$TAGS"
+fi
+ 
+# ============================================================================
+# PUSH IMAGES
+# ============================================================================
+ 
+echo ""
+echo "Pushing Docker images..."
+docker push "${IMAGE_BASE}:${COMMIT_SHA}"
+docker push "${IMAGE_BASE}:latest"
+ 
+if [ -n "$TAGS" ]; then
+    while IFS= read -r tag; do
+        if [ -n "$tag" ]; then
+            docker push "${IMAGE_BASE}:${tag}"
+        fi
+    done <<< "$TAGS"
+fi
+ 
+# ============================================================================
+# SUMMARY
+# ============================================================================
+ 
+echo ""
+echo "Build complete! Image pushed as:"
+echo "  - ${IMAGE_BASE}:${COMMIT_SHA}"
+echo "  - ${IMAGE_BASE}:latest"
+if [ -n "$TAGS" ]; then
+    while IFS= read -r tag; do
+        if [ -n "$tag" ]; then
+            echo "  - ${IMAGE_BASE}:${tag}"
+        fi
+    done <<< "$TAGS"
+fi
+ 
+ 
+ 

docker-compose.yml

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+version: '3.8'
+
+services:
+  nginx-cache-proxy:
+    build: .
+    ports:
+      - "3000:3000"
+    volumes:
+      - nginx_cache:/var/cache/nginx
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3000/?url=http://httpbin.org/get"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  nginx_cache:

nginx.conf

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+http {
+
+    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=api_cache:10m max_size=1g inactive=365d;
+
+    server {
+
+        listen 3000;
+
+        location / {
+
+            proxy_cache api_cache;
+
+            proxy_cache_valid 200 365d;
+
+            # Only cache if X-Cache header is present
+
+            proxy_cache_bypass $http_x_cache_inverse;
+
+            proxy_no_cache $http_x_cache_inverse;
+
+            # Set inverse variable (cache disabled by default)
+
+            set $http_x_cache_inverse 1;
+
+            if ($http_x_cache) {
+
+                set $http_x_cache_inverse 0;
+
+            }
+
+            proxy_cache_key $scheme$proxy_host$uri$is_args$args;
+
+            proxy_pass $arg_url;
+
+            add_header X-Cache-Status $upstream_cache_status;
+
+        }
+
+    }
+
+}