[BUG] API Error: 524 <!DOCTYPE html>
Resolved 💬 3 comments Opened Jan 7, 2026 by K4leri Closed Jan 11, 2026
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
i am doing just simple and as always standart session in claude code and then get 524 server error.
Feedback ID: 7290de3b-e9e5-4a52-83af-be8e837344c3
What Should Happen?
no 524 error
Error Messages/Logs
● Read(src\context\writer.zig)
⎿ Read 100 lines
⎿ API Error: 524 <!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en-US"> <![endif]-->
<!--[if IE 7]> <html class="no-js ie7 oldie" lang="en-US"> <![endif]-->
<!--[if IE 8]> <html class="no-js ie8 oldie" lang="en-US"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en-US"> <!--<![endif]-->
<head>
<title>newcli.com | 524: A timeout occurred</title>
<meta charset="UTF-8" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<link rel="stylesheet" id="cf_styles-css" href="/cdn-cgi/styles/main.css" />
</head>
<body>
<div id="cf-wrapper">
<div id="cf-error-details" class="p-0">
<header class="mx-auto pt-10 lg:pt-6 lg:px-8 w-240 lg:w-full mb-8">
<h1 class="inline-block sm:block sm:mb-2 font-light text-60 lg:text-4xl text-black-dark leading-tight mr-2">
<span class="inline-block">A timeout occurred</span>
<span class="code-label">Error code 524</span>
</h1>
<div>
Visit <a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=code.newcli.com" target="_blank" rel="noopener noreferrer">cloudflare.com</a> for more information.
</div>
<div class="mt-3">2026-01-07 17:53:52 UTC</div>
</header>
<div class="my-8 bg-gradient-gray">
<div class="w-240 lg:w-full mx-auto">
<div class="clearfix md:px-8">
<div id="cf-browser-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none
text-center">
<div class="relative mb-10 md:m-0">
<span class="cf-icon-browser block md:hidden h-20 bg-center bg-no-repeat"></span>
<span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>
</div>
<span class="md:block w-full truncate">You</span>
<h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">
Browser
</h3>
<span class="leading-1.3 text-2xl text-green-success">Working</span>
</div>
<div id="cf-cloudflare-status" class=" relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left md:float-none
text-center">
<div class="relative mb-10 md:m-0">
<a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=code.newcli.com" target="_blank" rel="noopener noreferrer">
<span class="cf-icon-cloud block md:hidden h-20 bg-center bg-no-repeat"></span>
<span class="cf-icon-ok w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>
</a>
</div>
<span class="md:block w-full truncate">Frankfurt</span>
<h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">
<a href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=code.newcli.com" target="_blank" rel="noopener noreferrer">
Cloudflare
</a>
</h3>
<span class="leading-1.3 text-2xl text-green-success">Working</span>
</div>
<div id="cf-host-status" class="cf-error-source relative w-1/3 md:w-full py-15 md:p-0 md:py-8 md:text-left md:border-solid md:border-0 md:border-b md:border-gray-400 overflow-hidden float-left
md:float-none text-center">
<div class="relative mb-10 md:m-0">
<span class="cf-icon-server block md:hidden h-20 bg-center bg-no-repeat"></span>
<span class="cf-icon-error w-12 h-12 absolute left-1/2 md:left-auto md:right-0 md:top-0 -ml-6 -bottom-4"></span>
</div>
<span class="md:block w-full truncate">code.newcli.com</span>
<h3 class="md:inline-block mt-3 md:mt-0 text-2xl text-gray-600 font-light leading-1.3">
Host
</h3>
<span class="leading-1.3 text-2xl text-red-error">Error</span>
</div>
</div>
</div>
</div>
<div class="w-240 lg:w-full mx-auto mb-8 lg:px-8">
<div class="clearfix">
<div class="w-1/2 md:w-full float-left pr-6 md:pb-10 md:pr-0 leading-relaxed">
<h2 class="text-3xl font-normal leading-1.3 mb-4">What happened?</h2>
<p class="mb-2">The origin web server timed out responding to this request.</p><p>The likely cause is an overloaded background task, database or application, stressing the resources on the host web
server.</p>
</div>
<div class="w-1/2 md:w-full float-left leading-relaxed">
<h2 class="text-3xl font-normal leading-1.3 mb-4">What can I do?</h2>
<h3 class="text-15 font-semibold mb-2">If you're a visitor of this website:</h3>
<p class="mb-6">Please try again in a few minutes.</p>
<h3 class="text-15 font-semibold mb-2">If you're the owner of this website:</h3>
<p>Please refer to the <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/">Error 524</a> article:</p>
<ul class="ml-4">
<li>Contact your hosting provider; check for long-running processes or an overloaded web server.</li>
<li>Use status polling of large HTTP processes to avoid this error.</li>
<li>Run the long-running scripts on a <a rel="noopener noreferrer" href="https://developers.cloudflare.com/dns/proxy-status/#dns-only-records">grey-clouded subdomain</a>.</li>
<li>Enterprise customers can <a rel="noopener noreferrer" href="https://developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-524/#resolution-on-cloudflare">increase
the timeout setting</a> globally or for specific requests using Cache Rules.</li>
</ul>
</div>
</div>
</div>
<div class="cf-error-footer cf-wrapper w-240 lg:w-full py-10 sm:py-4 sm:px-8 mx-auto text-center sm:text-left border-solid border-0 border-t border-gray-300">
<p class="text-13">
<span class="cf-footer-item sm:block sm:mb-1">Cloudflare Ray ID: <strong class="font-semibold">9ba54e23affb9aab</strong></span>
<span class="cf-footer-separator sm:hidden">•</span>
<span id="cf-footer-item-ip" class="cf-footer-item hidden sm:block sm:mb-1">
Your IP:
<button type="button" id="cf-footer-ip-reveal" class="cf-footer-ip-reveal-btn">Click to reveal</button>
<span class="hidden" id="cf-footer-ip">255.255.255.255</span> // ip changed
<span class="cf-footer-separator sm:hidden">•</span>
</span>
<span class="cf-footer-item sm:block sm:mb-1"><span>Performance & security by</span> <a rel="noopener noreferrer"
href="https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_524&utm_campaign=code.newcli.com" id="brand_link" target="_blank">Cloudflare</a></span>
</p>
<script>(function(){function d(){var b=a.getElementById("cf-footer-item-ip"),c=a.getElementById("cf-footer-ip-reveal");b&&"classList"in
b&&(b.classList.remove("hidden"),c.addEventListener("click",function(){c.classList.add("hidden");a.getElementById("cf-footer-ip").classList.remove("hidden")}))}var
a=document;document.addEventListener&&a.addEventListener("DOMContentLoaded",d)})();</script>
</div><!-- /.error-footer -->
</div>
</div>
</body>
</html>
⎿ Interrupted · What should Claude do instead?
❯ continue
⎿ API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.0: Invalid `signature` in `thinking` block"},"request_id":"req_011CWttuHe6PU2B5J1bVz7BV"}Steps to Reproduce
idn
Claude Model
Opus
Is this a regression?
I don't know
Last Working Version
_No response_
Claude Code Version
2.1.1 (Claude Code)
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
Windows Terminal
Additional Information
_No response_
This issue has 3 comments on GitHub. Read the full discussion on GitHub ↗