Watchguard V10 User Manual page 297

Maximum Total Length
Maximum Line Length
Firebox Vclass User Guide
Specifies the maximum total length of the HTTP
Response Headers, in bytes. Set this to 0 to specify
no limit. Some systems might be vulnerable to
overflow exploits that use very large headers. If the
total header size exceeds this limit, the entire HTTP
Response is denied. The default value is 0 (no
limit).
This specifies the maximum allowed length of a
line of characters in the HTTP Response Headers.
Some systems might be vulnerable to buffer
overflows with very long lines, so you can adjust
this setting according to the capabilities of your
systems. The default value is 1024 bytes.
Proxy Parameters Reference
265