21b8ce029f
Without a resolver directive, nginx resolves upstream hostnames once at
startup and caches the IP forever. When the API container restarts it gets
a new Docker-assigned IP, causing 502 Bad Gateway until nginx is reloaded.
Fix:
- Add 'resolver 127.0.0.11 valid=10s' (Docker embedded DNS)
- Use a variable in proxy_pass ('set \ api') so nginx
re-resolves on every request using the resolver above
- Variable proxy_pass passes the full request URI as-is, so /api/...
correctly maps to http://api:8000/api/... without double-pathing
65 lines
2.8 KiB
Plaintext
65 lines
2.8 KiB
Plaintext
server {
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listen 80;
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server_name _;
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# Use Docker's embedded DNS resolver so nginx re-resolves upstream hostnames
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# dynamically instead of caching IPs at startup (prevents 502 after container restarts).
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resolver 127.0.0.11 valid=10s ipv6=off;
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root /usr/share/nginx/html;
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index index.html;
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# Security headers (server-level -- inherited by all locations unless overridden)
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add_header X-Frame-Options "SAMEORIGIN" always;
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add_header X-Content-Type-Options "nosniff" always;
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add_header X-XSS-Protection "0" always;
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add_header Referrer-Policy "strict-origin-when-cross-origin" always;
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add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
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# CSP for React SPA with Tailwind CSS and Leaflet maps
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# worker-src required for SRP key derivation Web Worker (Safari won't fall back to script-src)
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add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https://*.tile.openstreetmap.org; font-src 'self'; connect-src 'self'; worker-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self';" always;
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# Proxy API requests to the backend service
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# The api container is reachable via Docker internal DNS as "api" on port 8000
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location /api/ {
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# Use a variable so nginx applies the resolver on every request.
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# With a variable in proxy_pass, nginx passes the full request URI as-is
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# (no path stripping), so the upstream receives /api/... correctly.
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set $api_upstream api;
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proxy_pass http://$api_upstream:8000;
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proxy_http_version 1.1;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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# Disable buffering for streaming/SSE endpoints
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proxy_buffering off;
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proxy_read_timeout 300s;
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# Hide nginx server-level CSP — backend sets its own CSP on API responses
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proxy_hide_header Content-Security-Policy;
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}
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# Serve static assets with long cache headers
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# Note: add_header in a location block clears parent-block headers,
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# so we re-add the essential security header for static assets.
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location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
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expires 1y;
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add_header Cache-Control "public, immutable" always;
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add_header X-Content-Type-Options "nosniff" always;
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try_files $uri =404;
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}
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# SPA routing: all other requests serve index.html
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location / {
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try_files $uri $uri/ /index.html;
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}
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# Health check endpoint for container probes
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location /nginx-health {
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access_log off;
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return 200 "OK\n";
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add_header Content-Type text/plain;
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}
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}
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