Increasing or decreasing the size of the HTTP Request header field
 Technote (troubleshooting)
 
Problem(Abstract)
Server administrators might need to increase or decrease the size of the HTTP Request header field. A server needs this value to be large enough to handle normal client requests. A server administrator might want to avoid certain denial of service attacks by decreasing the size of this value.
 
Cause
The default HTTP Request Header value is 8190 bytes.
 
Resolving the problem
The LimitRequestFieldSize directive should be used to increase or decrease the default limit for each field (line) in the request header beyond 8K.

Example:
Place the directive anywhere in the httpd.conf file:

LimitRequestFieldSize 2000

Required levels of IBM HTTP Server for increasing beyond 8K:
  • V6.0 releases require 6.0.0.2 or later
  • V2.0.42 releases require cumulative fix PK01070 or later
  • V2.0.47 releases require cumulative fix PK01070 or later
  • V1.3 releases do not support increasing beyond 8K
 
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > IBM HTTP Server > Base Server
Operating system(s): z/OS
Software version: 6.0.2.3
Software edition:
Reference #: 1223419
IBM Group: Software Group
Modified date: Nov 21, 2005