Apache page bad Request,cookie length setting

Apache Cookie Server php

When testing a Web page, when the number reaches a certain value, the page error, prompt as follows:
Bad Request

Your Browser sent a request that this server could not understand.
Size of a Request header field exceeds server limit.

This is followed by a long cookie.

After I consulted the information, I was prompted to say that the Apache server cookie byte limit was possible, so I modified the Apache configuration as follows:
Limitrequestfields 40940
Limitrequestbody 40940
Limitrequestfieldsize 40940
Limitrequestline 40940

Unfortunately, after the test, still error, please help us greatly, see if there is a solution, thank you!

Reply to discussion (solution)

Size of a Request header field exceeds server limit
The size of the request header field exceeds the server limit

The server forgot to restart or thanks for the help upstairs.

