server {
listen 80;
server_name localhost;
# Security headers
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "no-referrer-when-downgrade" always;
add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline'" always;
# Root directory for static files
root /usr/share/nginx/html;
index index.html;
# API proxy configuration
location /api/ {
# Choose API backend based on MOCK_API environment variable
set $api_backend "${API_URL}";
proxy_pass $api_backend;
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;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_cache_bypass $http_upgrade;
# CORS headers for API requests
add_header 'Access-Control-Allow-Origin' '*' always;
add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
# Handle preflight requests
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain; charset=utf-8';
add_header 'Content-Length' 0;
return 204;
}
}
# MCP server proxy configuration
# Use prefix match with ^~ to stop searching and prevent SPA catch-all
location ^~ /mcp/ {
# Proxy to Preloop backend API
set $api_backend "${API_URL}";
proxy_pass $api_backend;
proxy_http_version 1.1;
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 $scheme;
# MCP-specific headers
proxy_set_header Content-Type application/json;
}
# Static files with caching
location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
expires 1y;
add_header Cache-Control "public, immutable";
try_files $uri =404;
}
# SPA routing - serve index.html for all non-API routes
location / {
try_files $uri $uri/ /index.html;
}
# Disable caching for index.html
location = /index.html {
add_header Cache-Control "no-cache, no-store, must-revalidate";
add_header Pragma "no-cache";
add_header Expires "0";
}
# Health check endpoint
location /health {
access_log off;
return 200 "healthy\n";
add_header Content-Type text/plain;
}
}
