Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045

Closed
#103328
Closed
Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
#103328
Assignees
wfurt
Labels
area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
Milestone
9.0.0

Description

@ole1986
ole1986
opened on Aug 24, 2023

Description

Believe it or not!

I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.

As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri

WebRequest.DefaultWebProxy.GetProxy("https://google.de")

Reproduction Steps

  1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
  2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
  3. Enable and save the Proxysettings
  4. Run the console app and expect a NULL to be returned from GetProxy(...) method

Expected behavior

WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system

Actual behavior

WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL

Regression?

I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6

Known Workarounds

NOW COME THE FUN PART

The workaround to use the very old "Internet option" which is still available in Win10

image

Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix

Configuration

  1. .NET 6
  2. Win10 Build 1905.3324
  3. x64 platform
  4. Visual Studio 2022 17.6.5

Other information

No response

Metadata

Metadata

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area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged

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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" + '

    Skip to content
    Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
    Closed
    #103328
    Closed
    Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
    #103328
    Assignees
    wfurt
    Labels
    area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
    Milestone
    9.0.0
    Description
    @ole1986
    ole1986
    opened on Aug 24, 2023
    Description
    Believe it or not!
    I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
    As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
    WebRequest.DefaultWebProxy.GetProxy("https://google.de")
    Reproduction Steps
    1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
    2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
    3. Enable and save the Proxysettings
    4. Run the console app and expect a NULL to be returned from GetProxy(...) method
    Expected behavior
    WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
    Actual behavior
    WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
    Regression?
    I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
    Known Workarounds
    NOW COME THE FUN PART
    The workaround to use the very old "Internet option" which is still available in Win10
    image
    Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
    Configuration
    1. .NET 6
    2. Win10 Build 1905.3324
    3. x64 platform
    4. Visual Studio 2022 17.6.5
    Other information
    No response
    Metadata
    Metadata
    Assignees
    Labels
    area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
    Type
    No type
    Projects
    No projects
      Milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, '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
      Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
      Closed
      #103328
      Closed
      Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
      #103328
      Assignees
      wfurt
      Labels
      area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
      Milestone
      9.0.0
      Description
      @ole1986
      ole1986
      opened on Aug 24, 2023
      Description
      Believe it or not!
      I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
      As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
      WebRequest.DefaultWebProxy.GetProxy("https://google.de")
      Reproduction Steps
      1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
      2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
      3. Enable and save the Proxysettings
      4. Run the console app and expect a NULL to be returned from GetProxy(...) method
      Expected behavior
      WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
      Actual behavior
      WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
      Regression?
      I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
      Known Workarounds
      NOW COME THE FUN PART
      The workaround to use the very old "Internet option" which is still available in Win10
      image
      Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
      Configuration
      1. .NET 6
      2. Win10 Build 1905.3324
      3. x64 platform
      4. Visual Studio 2022 17.6.5
      Other information
      No response
      Metadata
      Metadata
      Assignees
      Labels
      area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
      Type
      No type
      Projects
      No projects
        Milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, '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
        Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
        Closed
        #103328
        Closed
        Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
        #103328
        Assignees
        wfurt
        Labels
        area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
        Milestone
        9.0.0
        Description
        @ole1986
        ole1986
        opened on Aug 24, 2023
        Description
        Believe it or not!
        I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
        As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
        WebRequest.DefaultWebProxy.GetProxy("https://google.de")
        Reproduction Steps
        1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
        2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
        3. Enable and save the Proxysettings
        4. Run the console app and expect a NULL to be returned from GetProxy(...) method
        Expected behavior
        WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
        Actual behavior
        WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
        Regression?
        I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
        Known Workarounds
        NOW COME THE FUN PART
        The workaround to use the very old "Internet option" which is still available in Win10
        image
        Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
        Configuration
        1. .NET 6
        2. Win10 Build 1905.3324
        3. x64 platform
        4. Visual Studio 2022 17.6.5
        Other information
        No response
        Metadata
        Metadata
        Assignees
        Labels
        area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
        Type
        No type
        Projects
        No projects
          Milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, '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
          Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
          Closed
          #103328
          Closed
          Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
          #103328
          Assignees
          wfurt
          Labels
          area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
          Milestone
          9.0.0
          Description
          @ole1986
          ole1986
          opened on Aug 24, 2023
          Description
          Believe it or not!
          I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
          As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
          WebRequest.DefaultWebProxy.GetProxy("https://google.de")
          Reproduction Steps
          1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
          2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
          3. Enable and save the Proxysettings
          4. Run the console app and expect a NULL to be returned from GetProxy(...) method
          Expected behavior
          WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
          Actual behavior
          WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
          Regression?
          I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
          Known Workarounds
          NOW COME THE FUN PART
          The workaround to use the very old "Internet option" which is still available in Win10
          image
          Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
          Configuration
          1. .NET 6
          2. Win10 Build 1905.3324
          3. x64 platform
          4. Visual Studio 2022 17.6.5
          Other information
          No response
          Metadata
          Metadata
          Assignees
          Labels
          area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
          Type
          No type
          Projects
          No projects
            Milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, '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
            Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
            Closed
            #103328
            Closed
            Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
            #103328
            Assignees
            wfurt
            Labels
            area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
            Milestone
            9.0.0
            Description
            @ole1986
            ole1986
            opened on Aug 24, 2023
            Description
            Believe it or not!
            I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
            As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
            WebRequest.DefaultWebProxy.GetProxy("https://google.de")
            Reproduction Steps
            1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
            2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
            3. Enable and save the Proxysettings
            4. Run the console app and expect a NULL to be returned from GetProxy(...) method
            Expected behavior
            WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
            Actual behavior
            WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
            Regression?
            I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
            Known Workarounds
            NOW COME THE FUN PART
            The workaround to use the very old "Internet option" which is still available in Win10
            image
            Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
            Configuration
            1. .NET 6
            2. Win10 Build 1905.3324
            3. x64 platform
            4. Visual Studio 2022 17.6.5
            Other information
            No response
            Metadata
            Metadata
            Assignees
            Labels
            area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
            Type
            No type
            Projects
            No projects
              Milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, '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
              Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
              Closed
              #103328
              Closed
              Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
              #103328
              Assignees
              wfurt
              Labels
              area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
              Milestone
              9.0.0
              Description
              @ole1986
              ole1986
              opened on Aug 24, 2023
              Description
              Believe it or not!
              I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
              As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
              WebRequest.DefaultWebProxy.GetProxy("https://google.de")
              Reproduction Steps
              1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
              2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
              3. Enable and save the Proxysettings
              4. Run the console app and expect a NULL to be returned from GetProxy(...) method
              Expected behavior
              WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
              Actual behavior
              WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
              Regression?
              I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
              Known Workarounds
              NOW COME THE FUN PART
              The workaround to use the very old "Internet option" which is still available in Win10
              image
              Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
              Configuration
              1. .NET 6
              2. Win10 Build 1905.3324
              3. x64 platform
              4. Visual Studio 2022 17.6.5
              Other information
              No response
              Metadata
              Metadata
              Assignees
              Labels
              area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
              Type
              No type
              Projects
              No projects
                Milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, '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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                Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...) #91045
                Closed
                #103328
                Closed
                Specific Win10/11 Proxysettings cause wrong result in WebRequest.DefaultWebProxy.GetProxy(...)#91045
                #103328
                Assignees
                wfurt
                Labels
                area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
                Milestone
                9.0.0
                Description
                @ole1986
                ole1986
                opened on Aug 24, 2023
                Description
                Believe it or not!
                I noticed when running .NET 6 Framework on Win10 Build 1905.3324 with VS 2022 17.6.5 it seem to be important that the URL given in the System -> Proxysetting does not contain any "http://" prefixes in the address field.
                As long as Proxysetting is stored with "http://", the following code always returns NULL instead of the proxy Uri
                WebRequest.DefaultWebProxy.GetProxy("https://google.de")
                Reproduction Steps
                1. create a simple console app with WebRequest.DefaultWebProxy.GetProxy("https://google.de") to return
                2. Configure the Win10 System -> Proxysettings to contain "http://" in the address field (E.g. Address: http://proxy.fqdn.local Port: 3128) and keep the proxy exceptions empty
                3. Enable and save the Proxysettings
                4. Run the console app and expect a NULL to be returned from GetProxy(...) method
                Expected behavior
                WebRequest.DefaultWebProxy.GetProxy("https://google.de") should return the Proxy URL given in the Proxysettings of the system
                Actual behavior
                WebRequest.DefaultWebProxy.GetProxy("https://google.de") returns NULL
                Regression?
                I assume it worked on .NET 4.x since I used this framework version before migrating to .NET 6
                Known Workarounds
                NOW COME THE FUN PART
                The workaround to use the very old "Internet option" which is still available in Win10
                image
                Since, the Proxy configuration from the "Internet options" dialog causes the proxy address to always be stored without "http://" prefix
                Configuration
                1. .NET 6
                2. Win10 Build 1905.3324
                3. x64 platform
                4. Visual Studio 2022 17.6.5
                Other information
                No response
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                Labels
                area-System.Nethelp wanted[up-for-grabs] Good issue for external contributorsin-prThere is an active PR which will close this issue when it is merged
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