HttpIOException when establishing connection, unobserved task exception #102772

Closed
#102960
Closed
HttpIOException when establishing connection, unobserved task exception#102772
#102960
Labels
area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
Milestone
9.0.0

Description

@mattchidley
mattchidley
opened on May 28, 2024

Describe the bug

Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)

We have not seen this before 8.0.3 with our current environment.

We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.

Repro

While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.

Exceptions (if any)

UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)

Further technical details

We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0

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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
      HttpIOException when establishing connection, unobserved task exception #102772
      Closed
      #102960
      Closed
      HttpIOException when establishing connection, unobserved task exception#102772
      #102960
      Labels
      area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
      Milestone
      9.0.0
      Description
      @mattchidley
      mattchidley
      opened on May 28, 2024
      Describe the bug
      Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
      We have not seen this before 8.0.3 with our current environment.
      We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
      Repro
      While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
      Exceptions (if any)
      UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
      Further technical details
      We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
      Metadata
      Metadata
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      No one assigned
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        area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
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        No projects
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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('^' + ".*" + '

          Skip to content
          HttpIOException when establishing connection, unobserved task exception #102772
          Closed
          #102960
          Closed
          HttpIOException when establishing connection, unobserved task exception#102772
          #102960
          Labels
          area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
          Milestone
          9.0.0
          Description
          @mattchidley
          mattchidley
          opened on May 28, 2024
          Describe the bug
          Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
          We have not seen this before 8.0.3 with our current environment.
          We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
          Repro
          While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
          Exceptions (if any)
          UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
          Further technical details
          We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
            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
              HttpIOException when establishing connection, unobserved task exception #102772
              Closed
              #102960
              Closed
              HttpIOException when establishing connection, unobserved task exception#102772
              #102960
              Labels
              area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
              Milestone
              9.0.0
              Description
              @mattchidley
              mattchidley
              opened on May 28, 2024
              Describe the bug
              Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
              We have not seen this before 8.0.3 with our current environment.
              We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
              Repro
              While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
              Exceptions (if any)
              UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
              Further technical details
              We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                Type
                No type
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                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
                  HttpIOException when establishing connection, unobserved task exception #102772
                  Closed
                  #102960
                  Closed
                  HttpIOException when establishing connection, unobserved task exception#102772
                  #102960
                  Labels
                  area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                  Milestone
                  9.0.0
                  Description
                  @mattchidley
                  mattchidley
                  opened on May 28, 2024
                  Describe the bug
                  Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                  We have not seen this before 8.0.3 with our current environment.
                  We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
                  Repro
                  While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
                  Exceptions (if any)
                  UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                  Further technical details
                  We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                    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
                      HttpIOException when establishing connection, unobserved task exception #102772
                      Closed
                      #102960
                      Closed
                      HttpIOException when establishing connection, unobserved task exception#102772
                      #102960
                      Labels
                      area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                      Milestone
                      9.0.0
                      Description
                      @mattchidley
                      mattchidley
                      opened on May 28, 2024
                      Describe the bug
                      Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                      We have not seen this before 8.0.3 with our current environment.
                      We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
                      Repro
                      While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
                      Exceptions (if any)
                      UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                      Further technical details
                      We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                        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
                          HttpIOException when establishing connection, unobserved task exception #102772
                          Closed
                          #102960
                          Closed
                          HttpIOException when establishing connection, unobserved task exception#102772
                          #102960
                          Labels
                          area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                          Milestone
                          9.0.0
                          Description
                          @mattchidley
                          mattchidley
                          opened on May 28, 2024
                          Describe the bug
                          Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                          We have not seen this before 8.0.3 with our current environment.
                          We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
                          Repro
                          While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
                          Exceptions (if any)
                          UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                          Further technical details
                          We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                            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); }
})();
})();

                              Skip to content
                              HttpIOException when establishing connection, unobserved task exception #102772
                              Closed
                              #102960
                              Closed
                              HttpIOException when establishing connection, unobserved task exception#102772
                              #102960
                              Labels
                              area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                              Milestone
                              9.0.0
                              Description
                              @mattchidley
                              mattchidley
                              opened on May 28, 2024
                              Describe the bug
                              Ever since 8.0.3 we've been seeing UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                              We have not seen this before 8.0.3 with our current environment.
                              We are curious whether there has been a change in the framework with how the handshake handles an unexpected connection termination with the host? These errors coincide with service disruption on the host.
                              Repro
                              While I can't provide a working sample because I think timing and load plays a key factor, our belief is that during client -> server connection negotiation the webserver is shutdown.
                              Exceptions (if any)
                              UnobservedTaskException: System.Net.Http.HttpIOException: An HTTP/2 connection could not be established because the server did not complete the HTTP/2 handshake. (InvalidResponse)
                              Further technical details
                              We have observed this on .net 8.0.3, 8.04, and 8.0.5, we do not see this on 8.0.2 or 7.0
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                area-System.Net.Httpbughelp wanted[up-for-grabs] Good issue for external contributors
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions