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setContentLength negative or zero arguments?  RSS feed

 
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Hello fellows ranchers
Can somebody give some light what is appropriate behavior of setContentLength with negative or zero argument? My servlet Java Doc has nothing about that, so what will be more appropriate:
1. delete previously set content-length header
2. raise IllegalArgumentException
3. silently ignore
?
 
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Seems easy enough to test with a short servlet and a header sniffer. Have you tried it?
 
It is sorta covered in the JavaRanch Style Guide.
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