Node.js prerenderer for Angular etc.

example.conf

server_name example.com;

location / {
    # Angular/React/whatever frontend
    root /home/example/frontend/dist;
    try_files $uri @prerender;
}

# config for Node.js prerenderer
location @prerender {
    root /home/example/frontend/dist;
    
    set $prerender 0;
    if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator") {
        set $prerender 1;
    }
    if ($args ~ "_escaped_fragment_") {
        set $prerender 1;
    }
    if ($http_user_agent ~ "Prerender") {
        set $prerender 0;
    }
    if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
        set $prerender 0;
    }
    
    #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
    resolver 8.8.8.8;

    if ($prerender = 1) {
        
        #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
        set $prerender "localhost:3000";
        rewrite .* /$scheme://$host$request_uri? break;
        proxy_pass http://$prerender;
    }
    if ($prerender = 0) {
        rewrite .* /index.html break;
    }
}

# Django backend
location ~ ^/(api|) {
    include uwsgi_params;
    uwsgi_pass #localhost:9000;
    uwsgi_intercept_errors on;
}

package.json

{
  "name": "docker-prerender",
  "version": "1.0.0",
  "description": "Dockerfile to build the prerender container image",
  "main": "server.js",
  "dependencies": {
    "phantomjs-prebuilt": "^2.1.12",
    "prerender": "4.3.1",
    "sockjs-client": "^1.1.1"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node server.js"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/cerisier/docker-prerender.git"
  },
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/cerisier/docker-prerender/issues"
  },
  "homepage": "https://github.com/cerisier/docker-prerender"
}

server.js

var prerender = require('prerender');

var server = prerender({
	workers: process.env.PHANTOM_CLUSTER_NUM_WORKERS,
	iterations: process.env.PHANTOM_WORKER_ITERATIONS || 10,
	phantomBasePort: process.env.PHANTOM_CLUSTER_BASE_PORT || 12300,
	messageTimeout: process.env.PHANTOM_CLUSTER_MESSAGE_TIMEOUT
    });


server.use(prerender.removeScriptTags());

if (process.env.BASIC_AUTH_USERNAME) {
    server.use(prerender.basicAuth());
}

server.use(prerender.inMemoryHtmlCache());

//server.use(prerender.blacklist());
//server.use(prerender.httpHeaders());
// server.use(prerender.s3HtmlCache());
// server.use(require('my-plugin'));

server.start();