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🔀 DynamicProxy

Go Report Card

DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.

This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.

💡 Use Case

While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:

  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)

DynamicProxy solves this by acting as a smart middle layer:

  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.

🚀 Getting Started

To configure DynamicProxy, you need to set up the following environment variables:

  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).

Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):

  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)

You can then run the binary:

./dynamicproxy

🛠️ Building from Source

To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:

go mod tidy
go build -o dynamicproxy ./cmd/main.go

🐳 Docker

Build the image

docker build -t dynamicproxy .

Run the container

docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy

Run tests in Docker

docker build --target test.

About

Dynamic HTTP Forward Proxy with Upstream Proxy Switching

Topics

dynamic-switchingdynamicproxygogolangmapwingisproxy

Resources

Readme
GPL-3.0 license
Activity

Stars

1 star

Watchers

0 watching

Forks

0 forks
Report repository

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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" + '

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
Forks
0 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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
Forks
0 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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
Forks
0 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" + '

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
Forks
0 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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
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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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🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
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1 star
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0 watching
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0 forks
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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); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
🔀 DynamicProxy
Go Report Card
DynamicProxy is a lightweight HTTP forward proxy designed for flexible upstream proxy switching based on request context. It was built to overcome limitations in environments where only a single static proxy can be configured - like in Mapsui with GDAL on Windows.
This proxy enables both internal and external geo services to work seamlessly without reconfiguring or restarting your app. It dynamically routes requests through the appropriate upstream proxy or direct connection, based on rules you define.
💡 Use Case
While working with Mapsui + GDAL on Windows, we encountered a limitation: only one proxy could be configured globally, with no way to make exceptions. This was a problem because our application needed to access both:
  • Internal geo-services (which required no proxy)
  • External geo-services (which required a corporate proxy)
DynamicProxy solves this by acting as a smart middle layer:
  • It listens as a local proxy.
  • It inspects each request.
  • Based on destination (or other rules), it forwards via the right upstream proxy - or bypasses it entirely.
🚀 Getting Started
To configure DynamicProxy, you need to set up the following environment variables:
  • LISTEN_ADDR: The address where the proxy will listen for incoming requests (default: :8080).
  • UPSTREAM_PROXY: The upstream proxy address to use for external requests (e.g. corporate.proxy:8080).
  • PROXY_EXCEPTIONS: A comma-separated list of hostnames or IPs that should bypass the upstream proxy (e.g. localhost,somehost1,somehost2).
  • PROXY_AUTH: Optional authentication for the upstream proxy (currently only ntlm for windows is supported, e.g. ntlm).
Optional advanced timeout env vars (Go duration format, e.g. 10s, 2m):
  • SERVER_READ_HEADER_TIMEOUT (default: 10s)
  • SERVER_READ_TIMEOUT (default: 30s)
  • SERVER_WRITE_TIMEOUT (default: 30s)
  • SERVER_IDLE_TIMEOUT (default: 120s)
  • SERVER_MAX_HEADER_BYTES (default: 1048576)
  • CLIENT_REQUEST_TIMEOUT (default: 60s)
  • TRANSPORT_DIAL_TIMEOUT (default: 10s)
  • TRANSPORT_KEEP_ALIVE (default: 30s)
  • TRANSPORT_TLS_HANDSHAKE_TIMEOUT (default: 10s)
  • TRANSPORT_RESPONSE_HEADER_TIMEOUT (default: 30s)
  • TRANSPORT_EXPECT_CONTINUE_TIMEOUT (default: 1s)
  • TRANSPORT_IDLE_CONN_TIMEOUT (default: 90s)
  • TUNNEL_CONNECT_READ_WRITE_TIMEOUT (default: 15s)
You can then run the binary:
./dynamicproxy
🛠️ Building from Source
To build DynamicProxy from source, ensure you have Go 1.24.0 or later installed and run the following commands:
go mod tidy
go build -o dynamicproxy ./cmd/main.go
🐳 Docker
Build the image
docker build -t dynamicproxy .
Run the container
docker run -d -p 8080:8080 \
-e UPSTREAM_PROXY=corporate.proxy:8080 \
-e PROXY_EXCEPTIONS=localhost,internal.host \
dynamicproxy
Run tests in Docker
docker build --target test.
About
Dynamic HTTP Forward Proxy with Upstream Proxy Switching
Topics
dynamic-switchingdynamicproxygogolangmapwingisproxy
Resources
Readme
GPL-3.0 license
Activity
Stars
1 star
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages