Request headers too large This can happen in various scenarios, such as when a client sends too many cookies, or when the headers contain overly lengthy values. Feb 3, 2025 · Error "400 Bad Request - Request Header Or Cookie Too Large" in ASP. Nov 12, 2024 · client_header_buffer_size 16k; large_client_header_buffers 4 16k; Here’s the cURL command that replicates the request. The 'Request Header Too Large' error typically occurs when the HTTP headers exceed the server's limit. Jun 10, 2025 · Hi all, I have this problem about header is too long, after some research I found different solutions about increasing the size of the buffer "large_client_header_buffers 4 16k" but some say it is a registry in regedit (which I don't have and… Dec 6, 2024 · The specific message “Request Header or Cookie Too Large” suggests that the server is unable to handle the size of the request headers or cookies accompanying the request. The HTTP request that the user sends to the IIS server contains the Kerberos token in the WWW-Authenticate header, and the header size increases as the Oct 4, 2023 · Cookie size is too large – If you’re receiving the request header or cookie too large error, it means that the cookies set by the site you’re trying to visit have gotten too large. Suggested actions include adjusting Nginx’s buffer size to Jan 25, 2021 · In this blog post, we will share everything you need to know about the Request header or cookie too large error accompanied by possible solutions on how to fix 400 bad request error. Understand the implications and recommended solutions for managing HTTP headers effectively. js. Oct 26, 2022 · How Do I Fix Request Header Or Cookie Too Large? When you’re having problems with your network, checking for easy tweaks is always good before diving into the more detailed solutions. I am not able to find the exact cause for this. . curl requests would always work, as would requests from our JS application. Apr 20, 2025 · The Problem The "Request Header or Cookie Too Large" issue arises when the size of the request header or cookie exceeds the server's limit. This can automatically reduce the Jul 22, 2025 · The "Request header too large" message occurs if the session or the continuation token is too large. Jul 8, 2013 · I am getting a 400 Bad Request request header or cookie too large from nginx with my Rails app. Header compression can significantly reduce the size of your request headers. Jan 11, 2024 · Learn the causes and impacts of a bad request header field too long, and discover troubleshooting tips and prevention strategies. Feb 21, 2023 · HTTP 431 error code indicates that a server is rejecting a request due to its header fields being too large. Jan 22, 2025 · The error message “400 Bad Request: Request Header or Cookie Too Large” happens when a web server finds it difficult to handle a request from your browser. APIStatusError occurred: 431 “Request Header Fields Too Large” request body: {"model":"gpt-3. This happens because the information the browser is sending is too much. Preventing HTTP Error 431, also known as “Request Header Fields Too Large,” involves implementing strategies to ensure client request headers stay within the server’s limits. x application. The following sections describe the cause of the issue and its solution in each category. This error is part of the HTTP status code family, which serves as a system for servers to communicate with your browser about the state of your request. May 20, 2024 · What configurations can I adjust in NextAuth or Azure AD to prevent large headers from being generated? Are there best practices when configuring NextAuth with AzureADProvider to handle large groups or claim sizes? I have read this article about max token size and have yet to make the registry changes but did investigate the possible issues with too many user groups and we don't really have any users in a large number of groups maybe 10 users with more then 100 groups. Jul 16, 2024 · The “400 Bad Request: Request Header or Cookie Too Large” error indicates that the server cannot process the request because the headers or cookies are too large. Some users with sub 100 groups are also having this problem. The syntax is large_client_header_buffers number size;, where number is the maximum number of buffers and size is the size of each buffer. microsoftonline. Aug 8, 2020 · Excellent. May 10, 2024 · Learn about the causes of Bad Message 431 and how to adjust request header size to resolve it. com, I get the following error: 400 Bad Request Request Header Or Cookie Too Large Why is this happening? In order to actually be able to login, I have to clear all Xfinity cookies from my browser, which is frustrating to have to do each time. See full list on minitool. This can happen due to excessive cookie sizes or a large number of headers being sent with a request. In that situation, you need to either configure a higher limit (not sure if possible) or reduce the amount of information that you Feb 22, 2017 · Whenever I have a ingress controller which proxies to an ingress controller in a different namespace, I sometimes get "400 Bad Request: Request Header Or Cookie Too Large" Note that I am also using When I go to xfinity. Nov 22, 2024 · 431 Request Header Fields Too Large Asked 12 months ago Modified 12 months ago Viewed 141 times 431 Request Header Fields Too Large The HTTP 431 status code indicates that a server refuses to process a request because HTTP headers are too large. Nov 21, 2019 · The request may be resubmitted after reducing the size of the request headers. I try to add the annotations to ingress object, like this : nginx. the size of the request headers is too long" error and I could able to do nothing after that. Nov 17, 2022 · How to solve IllegalArgumentException: Request header is too large in spring boot When migrating a spring boot application to cloud, multiple layers got added to serve traffic. I am only storing a string id in my cookie so it should be t Apr 15, 2025 · Common Causes of 'Request Header or Cookie Too Large' Excessive Data in Headers: When a request includes a large amount of data in the headers, it can easily exceed the server's size limit. Sep 29, 2024 · In the case of "Request Header or Cookie Too Large," it specifically means that either the request header or the cookie data has exceeded the server - imposed limit. HTTP status code 431 indicates that the server is unable to process the request because the size of the request headers is too large. Jul 2, 2024 · However, when these headers become excessively large, the server may struggle to process them, resulting in the “size of the request headers is too long” error. Feb 22, 2025 · Q2: How can I check if my request headers are too large? A2: You can check the size of request headers using the developer tools in web browsers like Chrome or Firefox. Dec 10, 2019 · My nginx-ingress-controller is in the ingress-nginx namespace and I've set the large-client-header-buffers to 4 16k, 4 32k etc. Jul 30, 2025 · Understanding the root causes of “Request Header or Cookie Too Large” is the first step to fixing it. Apr 29, 2025 · Request Header Or Cookie Too Large This "solves itself" if I try later - I don't know exactly how much later - it typically works the next day again, but it doesn't work immediately if I refresh the page. It sounds highly technical and leaves many users wondering what went wrong and what to do next. Learn what the “431 Request Header Fields Too Large” error means, why it happens, and how to fix it when building or managing your website. g. Aug 23, 2025 · Troubleshoot "request header" on Chrome & other browsersAre you getting the "Request Header Or Cookie Too Large" error code? You may also see "400 Bad Request" when trying to visit a website. 5-turbo, an openai. Restarting the browser fixes the issue. Jan 7, 2020 · 431 (Request Header Fields Too Large) Asked 5 years, 10 months ago Modified 1 year ago Viewed 21k times Mar 27, 2025 · Don’t let HTTP errors ruin your online experience! Learn all about the HTTP error 431 “Request Header Fields Too Large” and how to fix it. Feb 23, 2024 · The HTTP Error 431, also known as “Request Header Fields Too Large”, is a status code indicating that the server is unable to process the request due to the size of the HTTP headers that are too long. The request that fails is the one that happens after the logging, isn't it? Seems that too much information might be stored in the auth cookie. This could happen because of Mar 11, 2025 · Struggling with HTTP Error 431? Learn what causes "Request Header Fields Too Large" and how to fix it in browsers, APIs, React, and Node. This can happen when a client sends too many cookies, or the headers themselves are excessively large. 431 can be used when the total size of request headers is too large, or when a single header field is too large. Dec 18, 2021 · We have a large jwt in header when execute api call, then the postman return http 400 bad request Error message is "Request Header Or Cookie Too Large". This can occur through multiple headers or a significant individual header (e. Oct 31, 2023 · Learn how to fix 400 Bad Request: Request Header Or Cookie Too Large with these five ways covered in our guide (with screenshots!) Large Request Headers: Similar to cookies, HTTP request headers can also become excessively large due to various reasons, including the inclusion of unnecessary information, multiple authentication tokens, or excessive data being sent during each request. From there, you can do more research. On prem: nginx -> spring boot app (tomcat) Azure: nginx -> azure application gateway -> nginx ingress controller -> spring boot app (tomcat) In Azure, we noticed that some of http requests threw 400 http status code in Request header is too large Asked 15 years, 7 months ago Modified 6 years, 7 months ago Viewed 30k times Nov 24, 2024 · Troubleshooting HTTP 400/414/413 Errors in NGINX: A Complete Guide 目录 隐藏 1 Common NGINX HTTP Request Size Errors and Their Solutions Mar 28, 2019 · The post provides solutions to the ‘Nginx 400 Bad Request Header or Cookies Too Large’ error. Jan 11, 2025 · By apipark — 11 Jan 2025 Understanding the 400 Bad Request Error: Resolving Request Header or Cookie Size Issues 400 bad request request header or cookie too large At some point, you have likely encountered a '400 Bad Request - Request Header or Cookie Too Large' NGINX error. These is nothing you can do about the request header size because it is usually defined in the HTTP handling hardware. Feb 15, 2025 · In this article, we will explore the causes of the 431 Request Header Fields Too Large error, its implications, and detailed steps on how to fix 431 Request Header Fields Too Large errors. Jan 8, 2025 · HTTP Error 431, also known as "Request Header Fields Too Large," occurs when a client (such as a web browser) sends a request to the server that includes headers which exceed the limits set by the server configuration. This is crucial for security and resource management. The `java. Apr 29, 2019 · Learn how to resolve the "HTTP Error 400. They should map to roles that each application interprets for it's own use. 431 - (Request Header Fields Too Large) Asked 5 years, 4 months ago Modified 3 years, 4 months ago Viewed 24k times Mar 9, 2018 · The best practice for claims is not to make them too fine-grained. Mar 22, 2024 · Learn how to set and use the max-http-header-size property in a Spring Boot 2. Jun 27, 2019 · nginx 431 Request Header Fields Too Large Asked 6 years, 5 months ago Modified 3 years, 7 months ago Viewed 15k times Feb 10, 2025 · Request Header Size: The headers of an HTTP request can become exceedingly large due to containing too much metadata, such as cookies, authentication tokens, or user information. Jun 10, 2025 · Introduction The '400 Bad Request' error, particularly the 'Request Header or Cookie Too Large' error, is a common issue that developers face while working with APIs. Apr 27, 2021 · 4 A potential thing could be that IIS thinks the cookie header is too long. If you are deploying to Cloudhub, then both the Shared and Dedicated Load Balancers also have a limitation on the amount of data that can be handled within the request or response. Oct 30, 2025 · The HTTP 431 Request Header Fields Too Large client error response status code indicates that the server refuses to process the request because the request's HTTP headers are too long. (There are 5 chunks at 4Kb per chunk) So I suspect IIS has a 16KB header limit. Check the MSDN: Cause This issue may occur when the user is a member of many Active Directory user groups. Apr 24, 2022 · It was inconsistent - most of the time I’d get “response header too large”, but sometimes the request would work. When a user is a member of a large number of active directory groups the Kerberos authentication token for the user increases in size. Oct 4, 2024 · The HTTP 431 error, or "Request Header Fields Too Large", means that the headers your browser sends to a website are too big. Utilize protocols like HTTP/2 and HTTP/3, which support header compression by default. Servers can use this status code when the size of a single header field or the total size of all headers exceeds the limit. 合計サイズが指定の上限を超えるヘッダーがリクエストに含まれている場合、 Apigee は、次の RFC に従って 431 Request Header Fields Too Large をスローします。 Feb 9, 2025 · The specific variant of this error—Request Header or Cookie Too Large—occurs when the headers, which include cookies sent by the client, exceed limits set by the server. Nov 22, 2020 · HTTP 431 status code indicates that a server refuses to process a request because HTTP headers are too big. Your JWT token encodes a tonne of information). Mar 1, 2025 · If you receive a 400 Bad Request, Request Header or Cookie Too Large or Big, nginx, message on Chrome, Edge, Firefox browser, then see how to fix it. Redirect Loops: Imagine Page A redirects you to Page B and Page B redirect back to Page A this is called redirect loops. Jul 30, 2025 · If you faced Request Header Or Cookie Too Large error in your browser. 431 Request Header Fields too large. IllegalArgumentException: request header is too large` exception occurs when the size of the HTTP request headers exceeds the limits set by the server. I noticed that Accept-Encoding headers for the request in Firefox were “zip, deflate, br, zstd”. This lets users attempt to fix the problem, such as by clearing their cookies. The same request with same image url works in gpt4 turbo. , an excessively long User-Agent string). com, as does almost every Microsoft service (O365, Azure, etc). 0 that are deprecated and will be removed soon. Use your browser's debugging tools or a proxy like Fiddler to see what is actually going on. This can happen due to a variety of reasons, such as: Excessive Data in Headers or Cookies: Including too much data in headers or cookies can cause them to exceed the size limit. Sep 7, 2017 · The error HTTP 400: Size of header request is too long generally happens because there's too many cookies or cookies that are too big. Dec 16, 2022 · I know we can specify the max header size in server. max-http-request-header-size in Spring Boot In Spring Boot applications, the server. It has also been made configurable because it was a breaking change for some: Oct 6, 2025 · The REQUEST_HEADER_TOO_LARGE error occurs when the size of the request headers in your function and Routing Middleware exceeds the allowed limits. Dec 6, 2024 · When I try to get into my account I get : 400 Bad Request Request Header Or Cookie Too Large Aug 9, 2024 · Hi While sending an image url as body for GPT4o, I am getting "431 Request header Filed Too Large". Feb 17, 2025 · One of those codes is the 431 or Request Header Fields Too Large error, and in this article we’ll explain what it is, when it shows up, and possible ways to avoid it. Common causes for this exception include: Mar 19, 2024 · when I use gpt-3. With the given information, we can't do anything but guess. This post will help you to fix this error in the easiest way. Including additional information within an HTTP request or response header can be rejected, if the amount is too large. Topic Replies Views Activity 431 Request Header Fields Too Large Traefik v1 kubernetes-ingress 1 3789 Aug 27, 2024 · @kuldeepcis-lab thanks for contacting us. More often than not, the Mar 27, 2022 · The moment it passes LocalRedirect code, it shows "http error 400. By default ASP. The size of the request headers is too long. Overly Large Cookies: Cookies can also become too large if they store excessive amounts of data, such as user preferences or session information. Nov 8, 2021 · 400 Bad Request, Request Header or Cookie Too Large error This is annoying as you can’t visit a particular website and the error is not limited to any particular browser. Jul 23, 2025 · Excessive Request Headers: Request Headers are the information that your browser sends to the server along with the request. If your browser sends too many headers in such a case server might not be able to handle them. com Oct 1, 2025 · Learn how to fix the HTTP Error 431 Request Header Fields Too Large message using four simple troubleshooting tips. Feb 21, 2025 · We would like to show you a description here but the site won’t allow us. max-http-request-header-size property sets a limit on the maximum size of HTTP request headers that your application can process. Aug 2, 2023 · What is '431 Request Header Fields Too Large'? Learn how to use and/or fix this HTTP status code, with free examples and code snippets. Dec 19, 2024 · The HTTP 431 Request Header Fields Too Large client-side error indicates the server refuses to process a request because its header fields are too large. Prevent server errors and optimize website performance. Don't know what to do with a website showing Request Header or Cookie Too Large error? Check out the solution with respect to various browsers. May 18, 2020 · Fixing HTTP_ERROR 431 in Node. At some point, you have likely encountered a '400 Bad Request - Request Header or Cookie Too Large' NGINX error. To help those running into this error, indicate which of the > two is the problem in the response body — ideally, also include which headers are too large. See for example Bad Request - Request Too Long HTTP Error 400. Please sort this out ASAP. Is there a way to configure this or it's static ? Thanks, Dec 4, 2024 · The specific cause related to “Request Header Too Large” typically arises when the headers sent in the HTTP request exceed the server’s configured limits. What could be the reason behind this… Feb 12, 2024 · Encountering an HTTP Error 431, tagged as “Request Header Fields Too Large,” can throw a wrench into your web surfing or site management plans. Azure AD B2C's login goes through login. The size of the request headers is too long" issue with detailed solutions and troubleshooting tips. Tagged with Mar 14, 2025 · Learn 6 easy ways to the fix 400 bad request – request header or cookie too large and prevent it from happening again to keep your site running smoothly. Oct 22, 2025 · While some errors are common, others, like the “HTTP 431 Request Header Fields Too Large” message, can be confusing. NET Core chunks up the cookie in 4Kb chunks, like this picture shows: So either you try to reduce the size of the cookie or look at the IIS settings, if you can increase the max header length? Feb 22, 2017 · Whenever I have a ingress controller which proxies to an ingress controller in a different namespace, I sometimes get "400 Bad Request: Request Header Or Cookie Too Large" Note that I am also using When I go to xfinity. The request may be resubmitted after reducing the size of the request headers. While the HTTP spec doesn’t impose any limits on the size of headers, most web servers do. ingress. Worth a shot. Oct 9, 2024 · How to Compress Header Size Sometimes, you aren't sending too many headers and your headers are bloated due to constraints out of your control (ex. lang. Jun 2, 2022 · What is '494 Request header too large'? Learn how to use and/or fix this HTTP status code, with free examples and code snippets. Jun 12, 2017 · There's an issue open to change this response to a 431 Request Header Fields Too Large which will be more descriptive and helpful. kubernetes Jan 7, 2020 · 431 (Request Header Fields Too Large) Asked 5 years, 10 months ago Modified 1 year ago Viewed 21k times Mar 27, 2025 · Don’t let HTTP errors ruin your online experience! Learn all about the HTTP error 431 “Request Header Fields Too Large” and how to fix it. Is there a way to configure this or it's static ? Thanks, Mar 8, 2025 · By apipark — 08 Mar 2025 How To Fix the 400 Bad Request Error: Request Header or Cookie Too Large - A Step-by-Step Guide 400 bad request request header or cookie too large Learn how to resolve the 'Request header is too large' error in your Spring web application running on Tomcat with practical solutions and code examples. NET MVC Application with AzureAD Authentication Lydia 0 Feb 3, 2025, 11:12 AM Jan 4, 2025 · Large headers can cause requests to fail with errors like: 431 Request Header Fields Too Large Or: Error: Max Header Size Exceeded Jan 20, 2024 · Set the large_client_header_buffers directive in the http block. To help those running into this error, indicate which of the two is the problem in the response body — ideally, also include which headers are too large. js by adjusting the max HTTP header size to 16KB to mitigate Denial of Service vulnerability (CVE-2018-12121). Jul 13, 2024 · The HTTP 431 Request Header Fields Too Large response status code indicates that the server refuses to process the request because the request’s HTTP headers are too long. It's a pain, and it prevents you from reaching your Jan 24, 2025 · Large Request Headers: Similar to cookies, request headers can accumulate data that might lead to the overall size exceeding the server's acceptable limit. Each HTTP request includes headers containing metadata about the request, such as cookies, user-agent data, and other information used by the server. Jan 18, 2025 · Request Header Too Large: This error message suggests that the headers sent in the request exceed what the server is willing to accept. Website limitations – Some websites have a limit to how much data they can accept in one request. Below, I’ve detailed the most common triggers, starting with user-side issues, drawn from my 15 years of tech troubleshooting. For example, you can set it to large_client_header_buffers 4 16k; to allow for 4 buffers, each 16KB in size, which should cover most use cases. It can be caused by proxy servers or other intermediaries. 5-turbo","messages": [ {"role May 27, 2025 · Understanding server. Aug 2, 2023 · Can we increase the basic headers size, for azure function apps in c#. 0. Thank you. max-http-header-size inside application properties but in Spring Boot 3. May 10, 2024 · Google Chrome、IE、Firefox、Microsoft Edgeで「Request Header Or Cookie Too Large（要求されたヘッダーまたはCookieが大きすぎます）」と表示された場合は、この記事を読んで解決策を見つけましょう。 The problem we are encountering is that a certain user, who belongs to a large number of active directory groups is getting intermittent 431 Request headers too long errors. On Postman it was missing zstd. I use three cookies in the request: large_cookie1 with 4,000 a characters large_cookie2 with 4,000 b characters large_cookie3 with 200 c characters From both the terminal and Postman, I receive a response without errors. qewp tldpi xrdz fbxng cszv qboq dehjuxf obxney zqjpkz rhb wogweyi fdiso gzufmw jqu egmf