Understand the HTTP 401 Unauthorized error code: What the causes are and how to fix it.
All HTTP Status Codes
203 Non-Authoritative Information
204 No Content
205 Reset Content
206 Partial Content
208 Already Reported
226 IM Used
300 Multiple Choices
301 Moved Permanently
303 See Other
304 Not Modified
305 Use Proxy
307 Temporary Redirect
308 Permanent Redirect
400 Bad Request
402 Payment Required
404 Not Found
405 Method Not Allowed
406 Not Acceptable
407 Proxy Authentication Required
408 Request Timeout
411 Length Required
412 Precondition Failed
413 Payload Too Large
414 Request-URI Too Long
415 Unsupported Media Type
416 Requested Range Not Satisfiable
417 Expectation Failed
418 I’m A Teapot
421 Misdirected Request
422 Unprocessable Entity
424 Failed Dependency
426 Upgrade Required
428 Precondition Required
429 Too Many Requests
431 Request Header Fields Too Large
444 Connection Closed Without Response
451 Unavailable For Legal Reasons
499 Client Closed Request
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The 401 HTTP is a client-side standard response status code. This error response indicates that the client request has not been completed because it lacks valid authentication credentials for the requested resource.
For instance, you get this HTTP 401 error code when you are trying to access a password protected page. You can also get this 401 error if your credentials expired.
For example, in Chrome browser, you’ll likely see a simple message telling you that “This page isn’t working”, like this one:
Sometimes, the server replies with a standardized error page, e.g. the Nginx 401 Authorization Required:
401 Unauthorized vs 403 Forbidden
The 401 error is similar to the “HTTP Error 403 Forbidden“. We get the 403 when we have valid credentials (or don’t need them) but access to the resource isn’t permitted (in other words, you are trying to access a private or restricted resource the server will never give you, no matter what).
On the other hand, we get the 401 status code when the resource is available, but we don’t provide, or don’t have, valid credentials.
