Forum Discussion
smp_86112
Cirrostratus
CirrostratusOptimizing If statement conditions
I see this examples like this all over the place:
when HTTP_REQUEST {
if { [HTTP::host] equals "www.myhost.com" and [HTTP::uri] equals "/myuri" } {
HTTP::redirect https://[HTTP::host][HTTP::...
hoolioCirrostratus
CirrostratusI think that's just down to the extra few cycles it takes to handle a longer string that's being set to lower case:
% set str ABCDEFGHIJKLMNOPQRSTABCDEFGHIJKLMN...
% string length $str
1000
% time {string tolower $str} 1000
79 microseconds per iteration
% set smaller_str [string range $str 100 end]
% time {string tolower $smaller_str} 1000
65 microseconds per iteration/
Though in theory you should set the Host value to lower case in order to check it. RFC2616 states that the Host evaluation must be done case-insensitively. In practice, I think all major browsers set the host to lowercase before sending the request anyhow.
Aaron
