501

Updated: 08/02/2020 by Computer Hope

501 may refer to any of the following:

501 in blue lettering.

1. 501 is an HTTP (hypertext transfer protocol) status code for not implemented; generated because a server cannot fulfill a request or lacks the capability to recognize the request method.

Tip

See our HTTP definition for a listing of other error codes.

2. 501 is an area code, see our 501 area code listing for further information.

Error, HTTP, Web design terms