![]() A website can use many cookies for the different functions it offers to visitors. For example, if you logged in previously on the site, the browser will save the login details for this site and will allow you to stay logged in for a longer time, even if you closed the browser tab. The saved cookies, on the other hand, store information from previous sessions on the site. The cached data allows you to reload faster as the browser has already downloaded files from the site locally on your computer and doesn’t require time to download them again from the server. In order to improve user experience and loading speeds, most popular browsers store data from previously-visited sites in the form of cached files and cookies. Web servers do not permit URLs containing two consecutive special characters, and the part “%%” is causing the web server to respond with a “400 Bad Request” message. In this example, the error is triggered by the double “ percentage” sign ( %) in the URL structure. The error indicates that the requested URL doesn’t have a valid structure or contains invalid characters which the web server is not recognizing as part of a valid URL address.īelow, you can see an example of an URL with a syntax error: This is a very common cause of a “400 Bad Request” error, and it is associated with the syntax of the address you are typing in your browser. We will examine each type of error in detail and what are its most common causes. These can be: expired cookies, syntax errors in the URL, outdated cache from your browser, file size limits when uploading a file, unsynchronized DNS cache from your device, or a server-related error. What are the most common causes of the “400 Bad Request” error?Īs we examined so far, the most common causes of the HTTP Error “400 Bad Request” are related to a local problem from your device or browser and, in rare cases – a misconfiguration on the website’s server. In the next section, we will examine the most common cases. In rare cases, the error may be caused by a misconfiguration in the website’s hosting server. The causes of the “400 Bad Request” can be various, but usually, they are related to a local issue on your browser or device. Below, you can see an example of a standard “400 Bad Request NGINX” error page. Also, it is important to note that the page for this error may be customized on the website’s hosting server. Some browsers may not show the error code and instead display a blank page. The “400 Bad Request” page may be displayed differently. The server can’t recognize and process your request – thus, it returns the “400 Bad Request” code. In other words, you are trying to access a website by sending a request to the website’s server. The HyperText Transfer Protocol (HTTP) 400 Bad Request response status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (for example, malformed request syntax, invalid request message framing, or deceptive request routing). The official description of the “400 Bad Request” error states: What is the HTTP Status “400 Bad Request”? The following article will explain what is the “400 Bad Request” error, the most common causes, and how to fix it. ![]() “400 Bad Request” is a general error that indicates that your browser sends a request to the website’s server and the server can’t process or recognize the request. Here you can see a detailed explanation of the various HTTP status codes. The 4.x.x HTTP error codes are client-side errors, and the different codes indicate the reason for the failed request. Sometimes, when trying to access a web page, your browser may return an error code “400 Bad Request,” and it is hard to tell what the actual problem is. Contact the website administrator or the hosting provider.How to fix the “400 Bad Request” Error?.What are the most common causes of the “400 Bad Request” error?.What is the HTTP Status “400 Bad Request”?.
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