-
400:
Bad Request: The request could not be understood by the web server due to
bad syntax.
-
401:
Unauthorized Request: This
error typically occurs when the web server will not allow that request
to be completed due to security settings related to a user name and
password.
-
403:
Access is forbidden: The
web server will not allow that HTTP request to be completed due to
security settings. For example, the web server may not allow access for a
specific set of IP addresses. If
a user from one of those IP addresses accesses the web page, that error
will appear.
-
404:
Object not found: Typically, this error occurs when the requested web page
could not be found on the server.
-
405:
Method not allowed: This
error may occur if a there is a configuration problem between the web
browser client and the web server.
-
500:
Server Error: This error typically occurs when the web server encounters an
unexpected condition.
-
501:
Not Implemented: The web server is not configured to handle that sort of HTTP
request.