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Support Oauth client secret in refresh #784

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Open
Support Oauth client secret in refresh#784
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P2Medium: important but non-blocking improvementenhancementNew feature or request

Description

@thomasa88
thomasa88
opened on Apr 1, 2026

Is your feature request related to a problem? Please describe.
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client

Describe the solution you'd like
Support storing and then using client secret in refresh.

Describe alternatives you've considered
Setting up Oauth myself.

Additional context

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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
      Skip to content
      Support Oauth client secret in refresh #784
      Open
      Open
      Support Oauth client secret in refresh#784
      Labels
      P2Medium: important but non-blocking improvementenhancementNew feature or request
      Description
      @thomasa88
      thomasa88
      opened on Apr 1, 2026
      Is your feature request related to a problem? Please describe.
      
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
      Describe the solution you'd like
      
Support storing and then using client secret in refresh.
      Describe alternatives you've considered
      
Setting up Oauth myself.
      Additional context
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        P2Medium: important but non-blocking improvementenhancementNew feature or request
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
          Skip to content
          Support Oauth client secret in refresh #784
          Open
          Open
          Support Oauth client secret in refresh#784
          Labels
          P2Medium: important but non-blocking improvementenhancementNew feature or request
          Description
          @thomasa88
          thomasa88
          opened on Apr 1, 2026
          Is your feature request related to a problem? Please describe.
          
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
          Describe the solution you'd like
          
Support storing and then using client secret in refresh.
          Describe alternatives you've considered
          
Setting up Oauth myself.
          Additional context
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            P2Medium: important but non-blocking improvementenhancementNew feature or request
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
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var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
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span.className = 'userscript-highlight';
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frag.appendChild(span);
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node.parentNode.replaceChild(frag, node);
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var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
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Array.from(node.childNodes).forEach(highlight);
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highlight(document.body);
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var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
              Skip to content
              Support Oauth client secret in refresh #784
              Open
              Open
              Support Oauth client secret in refresh#784
              Labels
              P2Medium: important but non-blocking improvementenhancementNew feature or request
              Description
              @thomasa88
              thomasa88
              opened on Apr 1, 2026
              Is your feature request related to a problem? Please describe.
              
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
              Describe the solution you'd like
              
Support storing and then using client secret in refresh.
              Describe alternatives you've considered
              
Setting up Oauth myself.
              Additional context
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                P2Medium: important but non-blocking improvementenhancementNew feature or request
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
                  Skip to content
                  Support Oauth client secret in refresh #784
                  Open
                  Open
                  Support Oauth client secret in refresh#784
                  Labels
                  P2Medium: important but non-blocking improvementenhancementNew feature or request
                  Description
                  @thomasa88
                  thomasa88
                  opened on Apr 1, 2026
                  Is your feature request related to a problem? Please describe.
                  
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
                  Describe the solution you'd like
                  
Support storing and then using client secret in refresh.
                  Describe alternatives you've considered
                  
Setting up Oauth myself.
                  Additional context
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    P2Medium: important but non-blocking improvementenhancementNew feature or request
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
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function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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// Try immediately
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// Try after navigation (SPA)
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lastUrl = location.href;
setTimeout(tryTheater, 500);
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observer.observe(document.body, { childList: true, subtree: true });
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
                      Skip to content
                      Support Oauth client secret in refresh #784
                      Open
                      Open
                      Support Oauth client secret in refresh#784
                      Labels
                      P2Medium: important but non-blocking improvementenhancementNew feature or request
                      Description
                      @thomasa88
                      thomasa88
                      opened on Apr 1, 2026
                      Is your feature request related to a problem? Please describe.
                      
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
                      Describe the solution you'd like
                      
Support storing and then using client secret in refresh.
                      Describe alternatives you've considered
                      
Setting up Oauth myself.
                      Additional context
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        P2Medium: important but non-blocking improvementenhancementNew feature or request
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
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var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
                          Skip to content
                          Support Oauth client secret in refresh #784
                          Open
                          Open
                          Support Oauth client secret in refresh#784
                          Labels
                          P2Medium: important but non-blocking improvementenhancementNew feature or request
                          Description
                          @thomasa88
                          thomasa88
                          opened on Apr 1, 2026
                          Is your feature request related to a problem? Please describe.
                          
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
                          Describe the solution you'd like
                          
Support storing and then using client secret in refresh.
                          Describe alternatives you've considered
                          
Setting up Oauth myself.
                          Additional context
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            P2Medium: important but non-blocking improvementenhancementNew feature or request
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
Support Oauth client secret in refresh · Issue #784 · modelcontextprotocol/rust-sdk · GitHub
                              Skip to content
                              Support Oauth client secret in refresh #784
                              Open
                              Open
                              Support Oauth client secret in refresh#784
                              Labels
                              P2Medium: important but non-blocking improvementenhancementNew feature or request
                              Description
                              @thomasa88
                              thomasa88
                              opened on Apr 1, 2026
                              Is your feature request related to a problem? Please describe.
                              
I'm trying to connect to an MCP server that uses DCR and returns an Oauth client ID and client secret. The auth works fine, but oauth refresh fails due to missing client_secret. Error: invalid_client
                              Describe the solution you'd like
                              
Support storing and then using client secret in refresh.
                              Describe alternatives you've considered
                              
Setting up Oauth myself.
                              Additional context
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                P2Medium: important but non-blocking improvementenhancementNew feature or request
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions