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Rack4Java middleware

Introduction

The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.

Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.

This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.

Middleware implementations in this project are as follows:

What it does Rack4Java middleware class(es) Based on
A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types

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Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java

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, '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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Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
Custom properties
Stars
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, '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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Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
Custom properties
Stars
1 star
Watchers
0 watching
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0 forks
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, '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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Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
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Stars
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, '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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README.textile
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Repository files navigation
Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
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, '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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Repository files navigation
Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
Custom properties
Stars
1 star
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, '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('^' + ".*" + '

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Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
About
Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
Resources
Readme
Activity
Custom properties
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors
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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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Rack4Java middleware
Introduction
The original ruby rack implementation has been enhanced by lots of additional “middleware” – self-contained, re-usable chunks of web-application functionality which can easily be composed into rich applications. As an extra bonus, many of the middleware implementations are open source, and so can also be used to learn tips and techniques for creating or improving your own rack middleware.
Rack4Java also supports the same kind of middleware but, being newer and less well-known, has not grown such a full set of resources.
This project is an attempt to “jump start” such an ecosystem by providing Rack4java “clones” of a broad selection of middleware, based on freely-available ruby rack code. There is no intention to claim ownership of the ideas here – each rack4Java middleware links clearly to the code it was based on.
Middleware implementations in this project are as follows:
What it does Rack4Java middleware class(es) Based on 
 A very simplistic page caching system. The first time a GET for a particular path (with no query parameters etc.) is seen a file is created from the response body. On subsequent requests, the pre-rendered file is returned instead. Note that if the enclosing server automatically serves static content, for example from a “public” directory, then setting the root file to that directory will mean that cached files are served directly by the container; only the first request comes through rack4java. FunkyCache.javagithub.com/tuupola/rack-funky-cache
 A way of associating static files to be served in case of 404 or 500 errors from the application. NaughtyStep.javagithub.com/mig-hub/naughty_step
 Attempt to derive an Accept header by inspecting the “file extension” of the URL leaf. AbstractFormat.javagithub.com/mynyml/rack-abstract-format
 Perform a content-negotiation process on behalf of an application. Deals with multiple types, q priorities and sub-type wild cards for both client and application. FormatNegotiator.javagithub.com/mynyml/rack-accept-media-types
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Examples (or clones, if you will) of existing ruby rack middleware converted to rack4java
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