I solved my problem. I didn't use the xercesImpl.jar that came with HttpUnit, since I already had another version of that jar file. After a while I decided to try with the xercesImpl.jar that came with HttpUnit, and now it works. Thankfully also the rest of my application seems to work...
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If I run a test at work, pointing to my hobby website, then it works, but running it from home, then it fails. Typically I get this response:
May not set parameter 'maxtemp' to '30'. Value must be one of: { }
The URL is http://upl.codeq.info/customizeform.html
A quick look at the form show that maxtemp is a dropdown with 7 options, of which one is "30".
I'm not sure what to do, and the response rates in these forums are pretty low, so I don't have much hope.
I solved my problem. I didn't use the xercesImpl.jar that came with HttpUnit, since I already had another version of that jar file. After a while I decided to try with the xercesImpl.jar that came with HttpUnit, and now it works. Thankfully also the rest of my application seems to work...