Apache Reference: http_core, LimitRequestBody
Limit Maximum Size of Request Message Body
Syntax: LimitRequestBody A
Example: LimitRequestBody 512000
Since: Apache 1.3
This directive sets a maximum size (in bytes) for a request
message body. The bytes argument must be an integer between
0 (meaning unlimited) to 2,147,483,647 (2 GB). If the client
request exceeds the limit on the allowed size of the HTTP
request message body, the server will return an error response
instead of servicing the request. In this way, the directive
gives the server administrator greater control over abnormal
client request behavior, which may help prevent some forms of
denial-of-service attacks.