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Rory_Hewitt_F5_'s avatar
Rory_Hewitt_F5_
Icon for Cirrus rankCirrus
Sep 30, 2015

Do I need to check HTTP::header exists before checking value?

I feel like this is a simple question, but I can't seem to find a definitive answer...   To check the value of a particular HTTP header, I can do this:   if { [HTTP::header Origin] ends_with "...
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Hannes_Rapp's avatar
Hannes_Rapp
Icon for Nimbostratus rankNimbostratus
Sep 30, 2015

Hello,

Use the first sample as it appears to be the most efficient and performance-friendly. If the header "Origin" is not found in the client's request, the block of code after the conditional statement will not be processed. There will be no TCL errors or any issues due.

Personally, I would use

 

if { [HTTP::header value "Origin"] ends_with "example.com" }

as the conditional statement, just for clarity reasons.