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Docker Image for Prerender

Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)

https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...

Setup

You can secure prerender in 3 ways:

  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network

Docker run: https://docs.docker.com/engine/reference/run/

Prerender: https://prerender.io/documentation

In-memory cache plugin: https://github.com/prerender/prerender-memory-cache

Examples

Run it with default settings, and expose the port to the public:

docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender

Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.

docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender

To debug the app (see prerender logs):

  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender

Cache

You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:

2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/

Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender

About

Docker image for Prerender.io with in memory cache.

hub.docker.com/r/bgadrian/docker-prerender/

Topics

dockerdocker-imagenodejsprerenderioreactjsseo

Resources

Readme
Activity

Stars

2 stars

Watchers

1 watching

Forks

6 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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4 Commits
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NameName
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README.md
README.md
server.js
server.js
Repository files navigation
Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Latest commit
History
4 Commits
Folders and files
NameName
Last commit message
Last commit date
Dockerfile
Dockerfile
README.md
README.md
server.js
server.js
Repository files navigation
Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Docker Image for Prerender
Dockerized Prerender + Chrome Headless (chromium-browser on Alpine Linux)
https://prerender.io is an open-source nodeJS based web server that servers HTML for web crawlers like Google, Twitter, Slack preview bots and so on. It is used to make SEO for single page web apps built with any framework: React, Angular, VueJS ...
Setup
You can secure prerender in 3 ways:
  • make it public and use the whitelist/blacklist options
  • expose the port to the localhost but binding it only to local interface: -p 127.0.0.1:3000:3000
  • do not expose the port and put it in a docker network
Docker run: https://docs.docker.com/engine/reference/run/
Prerender: https://prerender.io/documentation
In-memory cache plugin: https://github.com/prerender/prerender-memory-cache
Examples
Run it with default settings, and expose the port to the public:
docker run --detach \
--name prerender \
-it \
-p 3000:3000 \
bgadrian/docker-prerender
Run it with 7 days cache, 10.000 pages limit and in a docker network, the instance can be accesed by its container name by any other container running in the same network.
docker run --detach \
--name prerender \
-it \
--network my-net \
-e "CACHE_MAXSIZE=10000" \
-e "CACHE_TTL=604800" \
bgadrian/docker-prerender
To debug the app (see prerender logs):
  • run it in foreground (without --detach)
  • watch the logs docker logs -f prerender
  • attach your current terminal session to the prerender process sudo docker attach prerender
Cache
You can see the cache in action by reading the logs, eg from multiple calls of curl localhost:3000/https://twitter.com you may get <15ms subsequent responses:
2018-10-06T19:58:42.354Z got 200 in 2910ms for https://twitter.com/
2018-10-06T19:59:08.905Z getting https://twitter.com/
2018-10-06T19:59:08.917Z got 200 in 12ms for https://twitter.com/
2018-10-06T19:59:11.551Z getting https://twitter.com/
2018-10-06T19:59:11.557Z got 200 in 6ms for https://twitter.com/
Because the cache is in memory, to purge it (for example at each big release) you can just restart the container: docker restart prerender
About
Docker image for Prerender.io with in memory cache.
hub.docker.com/r/bgadrian/docker-prerender/
Topics
dockerdocker-imagenodejsprerenderioreactjsseo
Resources
Readme
Activity
Stars
2 stars
Watchers
1 watching
Forks
6 forks
Report repository
Releases
Packages
Contributors
Languages