Why is the behavior between Apache2 and Tomcat so different?

["david joffrin" <david_joffrin@xxxxxxxxxxx>]

Hi,

I have the same piece of PHP script running on either Apache2 or Tomcat.
On Tomcat, I have the folllowing errors:
1- Cannot modify header information - headers already sent ....
OR 2- Undefined index: error in ...

For one, I think this is because I am using the header PHP function.
For two, I think this is because there is from time to time a http request 
parameter ("error") which not always defined.

Could someone explain me why this is the case? And how I can change this 
behavior.

Thanks.
David Joffrin
www.etradinginnovations.co.uk

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