Cloudflare Worker are not waiting for streaming events #18360

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#18334
Closed
Cloudflare Worker are not waiting for streaming events#18360
#18334
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JPeer264
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Cloudflare Workers

Description

@JPeer264
JPeer264
opened on Dec 1, 2025

Problem

In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.

This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.

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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
    Cloudflare Worker are not waiting for streaming events #18360
    Closed
    #18334
    Closed
    Cloudflare Worker are not waiting for streaming events#18360
    #18334
    Assignees
    JPeer264
    Labels
    Cloudflare Workers
    Description
    @JPeer264
    JPeer264
    opened on Dec 1, 2025
    Problem
    In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
    This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
    Activity
    Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
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    Cloudflare Workers
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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
      Cloudflare Worker are not waiting for streaming events #18360
      Closed
      #18334
      Closed
      Cloudflare Worker are not waiting for streaming events#18360
      #18334
      Assignees
      JPeer264
      Labels
      Cloudflare Workers
      Description
      @JPeer264
      JPeer264
      opened on Dec 1, 2025
      Problem
      In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
      This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
      Activity
      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
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      Cloudflare Workers
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        Cloudflare Worker are not waiting for streaming events #18360
        Closed
        #18334
        Closed
        Cloudflare Worker are not waiting for streaming events#18360
        #18334
        Assignees
        JPeer264
        Labels
        Cloudflare Workers
        Description
        @JPeer264
        JPeer264
        opened on Dec 1, 2025
        Problem
        In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
        This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
        Activity
        Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
        Metadata
        Metadata
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        Cloudflare Workers
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          Cloudflare Worker are not waiting for streaming events #18360
          Closed
          #18334
          Closed
          Cloudflare Worker are not waiting for streaming events#18360
          #18334
          Assignees
          JPeer264
          Labels
          Cloudflare Workers
          Description
          @JPeer264
          JPeer264
          opened on Dec 1, 2025
          Problem
          In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
          This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
          Activity
          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
          Metadata
          Metadata
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          Labels
          Cloudflare Workers
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          No projects
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            None yet
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            No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            Cloudflare Worker are not waiting for streaming events #18360
            Closed
            #18334
            Closed
            Cloudflare Worker are not waiting for streaming events#18360
            #18334
            Assignees
            JPeer264
            Labels
            Cloudflare Workers
            Description
            @JPeer264
            JPeer264
            opened on Dec 1, 2025
            Problem
            In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
            This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
            Activity
            Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
            Metadata
            Metadata
            Assignees
            Labels
            Cloudflare Workers
            Projects
            No projects
              Milestone
              No milestone
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              None yet
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              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
              Cloudflare Worker are not waiting for streaming events #18360
              Closed
              #18334
              Closed
              Cloudflare Worker are not waiting for streaming events#18360
              #18334
              Assignees
              JPeer264
              Labels
              Cloudflare Workers
              Description
              @JPeer264
              JPeer264
              opened on Dec 1, 2025
              Problem
              In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
              This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
              Activity
              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
              Metadata
              Metadata
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              Labels
              Cloudflare Workers
              Projects
              No projects
                Milestone
                No 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
                Cloudflare Worker are not waiting for streaming events #18360
                Closed
                #18334
                Closed
                Cloudflare Worker are not waiting for streaming events#18360
                #18334
                Assignees
                JPeer264
                Labels
                Cloudflare Workers
                Description
                @JPeer264
                JPeer264
                opened on Dec 1, 2025
                Problem
                In getsentry/sentry-mcp#652 we had to manually wait for the flush to ensure that async operations completed before the response was sent.
                This was caused by the MCP server streaming data after the actual request has been finished. When using the Cloudflare SDK with MCP servers (or other streaming APIs), spans created during the streaming phase were not being flushed properly because the flush() method would complete before these async spans finished.
                Activity
                Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                Metadata
                Metadata
                Assignees
                Labels
                Cloudflare Workers
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions