Bug 3868

<%@taglib uri="http://jakarta.apache.org/taglibs/io-1.0" prefix="io" %>
<io:http url="http://www.allaire.com" action="get" />

Our JRun 3.1 server has tag caching.  When we use this in a JSP, we get the 
page the first time but not the second during refresh of the browser.

Steps:
1.  If you have JRun 3.1 16777 or higher 
NT
http://download1.allaire.com/publicdl/en/jrun/31/jr31_MPSB_03_04_05_06.exe 
Unix/Linux
http://download1.allaire.com/publicdl/en/jrun/31/jr31_MPSB_03_04_05_06.sh

installed and the default server running.  (No key is required).

The install should pretty much get you running.  NT starts up immediately and 
brings you to http://localhost:8000 - our html admin server.  The default 
server and web server you'll use is on http://localhost:8100.

Going to http://localhost:8100/demo should bring up a 'demo' examples page when 
the install is complete and default server running.

Do the following:

File 26888.zip will be mailed or included - it contains a subset of the Jakarta 
tag library - enough to run io:http

It contains tagtest.jsp, io.jar, web.xml and io.tld files.

-Place tagtest.jsp in web-app root (like /JRun/default/demo-app).
-Place web.xml and io.tld in /JRun/default/demo-app/WEB-INF. 
(if you're using JRun/default/demo-app, rename the existing web.xml to 
web.xml.orig first)

-Place io.jar in \JRun\default\demo-app\WEB-INF\lib

- Restart JRuns Default server and and run tagtest.jsp.

Unix - cd /usr/jrun/bin
jrun -start default &

NT
right mouse on the 'default server' in the sys tray and pick restart.

when the server is up (10 seconds or less), browse to

http://localhost:8100/demo/tagtest.jsp

The Allaire home page will display (WITHOUT IMAGES - THIS IS OK).  
- Click the browser refresh button - it now shows blank.

We found a workaround:  (and a bug according to Tom Reilly 
(treilly@allaire.com - the JRun developer).

(JRun) 3.0 didn't reuse tag handlers, 3.1 does.  This relies on a 
properly coded release method which was the problem with the tag in question.

Look at the initialization in the release method and compare that to the 
release method.  The release method should be setting output to true. 

Workaround:
Set the output="true" in the properties

Change:
<io:http url="http://www.allaire.com" action="GET" />
to
<io:http url="http://www.allaire.com" action="GET" output="true" />

You could also make this a REQUIRED attribute so you get a "REQUIRED 
attribute"  error when someone leaves it off (until the bug is fixed).

In io.tld, make sure it has the following:

<name>http</name>
<tagclass>org.apache.taglibs.io.HttpTag</tagclass>
<bodycontent>JSP</bodycontent>
<attribute>
<name>url</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>output</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>