Reverse Proxy Configuration¶

# /etc/nginx/sites-available/readur
server {
    listen 80;
    server_name readur.company.com;

    # Redirect HTTP to HTTPS
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl http2;
    server_name readur.company.com;

    # SSL Configuration
    ssl_certificate /etc/ssl/certs/readur.crt;
    ssl_certificate_key /etc/ssl/private/readur.key;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Security Headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Proxy Configuration
    location / {
        proxy_pass http://localhost:8000;
        proxy_http_version 1.1;

        # Headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # Buffering
        proxy_buffering off;
        proxy_request_buffering off;
    }

    # WebSocket support for real-time features
    location /ws {
        proxy_pass http://localhost:8000/ws;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Large file uploads
    client_max_body_size 500M;
    client_body_timeout 600s;
}

# Enhanced configuration with caching and compression

upstream readur_backend {
    server localhost:8000 max_fails=3 fail_timeout=30s;
    server localhost:8001 backup;  # Optional backup server
    keepalive 32;
}

server {
    listen 443 ssl http2;
    server_name readur.company.com;

    # ... SSL configuration ...

    # Compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1000;
    gzip_types text/plain text/css text/javascript 
               application/javascript application/json 
               application/xml image/svg+xml;

    # Static file caching
    location /static/ {
        alias /var/www/readur/static/;
        expires 30d;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # Media files
    location /media/ {
        alias /var/www/readur/media/;
        expires 7d;
        add_header Cache-Control "public";

        # Security for uploaded files
        add_header Content-Disposition "attachment";
        add_header X-Content-Type-Options "nosniff";
    }

    # API endpoints
    location /api/ {
        proxy_pass http://readur_backend;

        # No caching for API
        proxy_no_cache 1;
        proxy_cache_bypass 1;

        # Rate limiting
        limit_req zone=api_limit burst=20 nodelay;
        limit_req_status 429;
    }

    # Main application
    location / {
        proxy_pass http://readur_backend;

        # ... proxy headers ...

        # Connection pooling
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }
}

# Rate limiting zones
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=upload_limit:10m rate=1r/s;

# Strong SSL configuration
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
ssl_prefer_server_ciphers off;
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /etc/ssl/certs/chain.pem;

# HSTS
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

# NGINX connection tuning
events {
    worker_connections 4096;
    use epoll;
    multi_accept on;
}

http {
    # Keepalive
    keepalive_timeout 65;
    keepalive_requests 100;

    # Buffers
    client_body_buffer_size 128k;
    client_header_buffer_size 1k;
    large_client_header_buffers 4 8k;
    output_buffers 32 32k;
    postpone_output 1460;

    # File handling
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
}

# Cache configuration
proxy_cache_path /var/cache/nginx/readur 
    levels=1:2 
    keys_zone=readur_cache:100m 
    max_size=10g 
    inactive=60m
    use_temp_path=off;

location /api/documents/search {
    proxy_cache readur_cache;
    proxy_cache_valid 200 10m;
    proxy_cache_valid 404 1m;
    proxy_cache_key "$scheme$request_method$host$request_uri$args";
    proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
    proxy_cache_background_update on;
    proxy_cache_lock on;
    add_header X-Cache-Status $upstream_cache_status;
}

# Custom log format
log_format readur '$remote_addr - $remote_user [$time_local] '
                  '"$request" $status $body_bytes_sent '
                  '"$http_referer" "$http_user_agent" '
                  'rt=$request_time uct="$upstream_connect_time" '
                  'uht="$upstream_header_time" urt="$upstream_response_time"';

access_log /var/log/nginx/readur_access.log readur buffer=32k flush=5s;
error_log /var/log/nginx/readur_error.log warn;

# Health check endpoint
location /nginx-health {
    access_log off;
    add_header Content-Type text/plain;
    return 200 "healthy\n";
}

# Increase upload limits
client_max_body_size 1G;
client_body_buffer_size 10M;