Filters: Invoked on incoming Request or outgoing response

[Affan Qureshi <qu...@etilize.com>]

I am trying out some code to compress the content from my webapp using a
GZIP Filter. But I am confiused about two things.
- Is the filter invoked on incoming requests (or both)? How do we specify
when it is to be invoked?

- After configuring the filter in web.xml I get a garbage respone in the
browser (IE 5.x and NS 7.0). The filter uses GZip to compress the
outputStream it gets from response. But i guess the browser does not
automatically decompress the data. What do I ned to do to make it work.

Thanks and regards,

Affan


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line breaks

[Affan Qureshi <qu...@etilize.com>]

I am using Struts 1.1b2, Tomcat 4.1.12 LE, on Win2K.

I have a strange issue. I have a TEXTAREA type control that gets populated
from values in database. The value in the database has some line breaks. I
store that value in a variable called: "OLD_VALUE". Then I display the value
in the TEXTAREA and when i get it back(from form-bean) after the form is
submitted (without changing the value) i store it in a variable called
"NEW_VALUE". The two DON'T evaluate String.equals() to "true". When I paste
them in notepad I see that OLD_VALUE has line-breaks while the NEW_VALUE
does not have line breaks.

Has anyone else faced the same problem? I guess it has something to do with
\r and \r\n for line breaks on different platforms.

BTW the data in the database is saved in Oracle 8i through a Swing
client/server app. The App-Server for Swing app is Weblogic on Solaris for
SunSPARC. Then the data gets imported to XML and then to MySQL on Win2K.
Then the Struts app loads and display/edits it in the above form.

Thanks and regards,

Affan


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RE: Filters: Invoked on incoming Request or outgoing response

["Noel J. Bergman" <no...@devtech.com>]

> I am trying out some code to compress the content from my webapp using a
> GZIP Filter.

> The filter uses GZip to compress the outputStream it gets from
> response.

Did you write this filter?  Are you paying attention to the request header
that needs to be honored, and the response header that needs to be set?

ref: http://www.orionserver.com/tutorials/filters/5.html

Whose JVM are you using?  A friend running WebSphere found that IBM had done
something wrong in their version of GZIPOutputStream.  Switching to GNU
GZIPOutputStream, IIRC which one, fixed his problem.

	--- Noel


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