Last tested: October 22, 2026 · By Alex A 413 Request Entity Too Large error means the server refused the request because the body is bigger than it is configured to accept. You usually see it when uploading a theme, plugin, image, video, or backup file, or when an API sends a large JSON payload.
Last tested: October 22, 2026 · By Alex A 404 Not Found error means the server is reachable and understood the request, but it has nothing at that URL. The page may have been deleted or moved, the link may be wrong, or the server may not know how to route the URL to the
Last tested: October 22, 2026 · By Alex A 401 Unauthorized error means the server needs valid authentication for the resource you requested, and the request either did not include credentials or included credentials the server rejected. Despite the name, it is about authentication (who you are), not authorization (what you are allowed to do).
Last tested: October 22, 2026 · By Alex A 400 Bad Request error means the server received your request but refused to process it because something in the request itself is malformed, oversized, or invalid. The server is up. The problem is what the browser, app, or script sent. In practice, most 400 errors I
415 Unsupported Media Type means the server refused the request because the format of the request body is not supported. In most cases, the URL is correct and the server is reachable, but the body format, Content-Type, Content-Encoding, or upload type does not match what the endpoint expects. This is a request-format problem, not a
405 Method Not Allowed means the server understands the HTTP method, but the specific resource you requested does not allow that method. In simple terms, the URL exists, the server knows what GET, POST, PUT, or DELETE means, but that endpoint is not configured to accept the method you used. This is a configuration or
431 Request Header Fields Too Large means the server refused the request because the HTTP request headers were too large. In real cases, this usually comes from oversized cookies, a bloated Referer, too many custom headers, or header limits that are too strict on the server or proxy. :contentReference[oaicite:1]{index=1} This is not usually a mystery
414 Request-URI Too Long appears when the server refuses a request because the URL is too long to process 414 Request-URI Too Long means the server refused the request because the URL was too long to process. In most cases the problem is not the page itself — it is the request format, the query
408 Request Timeout often appears when a request is too slow to reach the server or intermediary layers 408 Request Timeout means the server gave up waiting for the client to finish sending the request. In simple terms, the connection started, but the full request did not arrive in time. This is not always a
429 Too Many Requests means the server is rate-limiting traffic, not that the site is fully down 429 Too Many Requests means the server is refusing requests because too many were sent in a short period. The site may still be online, but it is rate-limiting you, your browser, a bot, a plugin, or an