We’ll explore some of these scenarios (and potential solutions) down below.īe aware that, even though a 400 error is considered a client error response, it doesn’t inherently mean we can rule out either the client or the server as the root of the problem. Your client may be trying to send a file that’s too big, the request could be malformed in some way, the request HTTP headers could be invalid, and so forth. It’s entirely possible the issue is from the client-side. On the other hand, a 400 Bad Request Error indicates that the request sent by the client was invalid for one reason or another. Many smartphone apps using a modern-looking user interface are powered by a normal web application behind the scenes. This doesn’t apply solely to websites, either. This might include HTML, cascading style sheets (CSS), client-side JavaScript, and so forth.
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Oftentimes, if you’re trying to diagnose an issue within your own application, you can immediately ignore most client-side code and components. With that in mind, the appearance of a 400 error doesn’t necessarily mean the issue has something to do with the client (the web browser or device).
These types of messages contrast with errors in the 5xx category, such as the 504 Gateway Timeout Error we looked at last week, which are considered server error responses. Server- or Client-Side?Īll HTTP response status codes that are in the 4xx category are considered client error responses. Lastly, we’ll explore a handful of the most common content management systems ( CMSs ) that are in use today and how these systems can cause an unexpected 400 Bad Request Error. We’ll also go over a few tips and tricks to help you diagnose and debug your own application if it’s reporting a 400 error for some reason. Throughout this article, we’ll examine the 400 Bad Request error by digging into whether the root cause is on the local client or remote server. As you can imagine, determining the cause of a 400 error can be difficult, even within a controlled development environment.
Such HTTP response codes represent the complex relationship between the client, a web application, a web server, and often multiple third-party web services. As with the dozens of potential HTTP response codes, receiving a 400 error while accessing your own application can be both frustrating and challenging to fix. The 400 Bad Request Error is an HTTP response status code indicating that the server was unable to process the request sent by the client due to invalid syntax.
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