EDIT

the below request starts producing an archive but once the process is complete the next call at this URI seems to delete the archive instead of delivering it. The cache should only be cleared after the clean up timeout of the progress monitor has been reached. To me it seems as if there no point having this clearCache parameter.

http://api.cybertaxonomy.org:80/phycobank/dwca/dwcaTaxExport?clearCache=true&doMisapplieds=true&doSynonyms=true&doImages=false&doDescriptions=false&doDistributions=false&doVernaculars=true&doTypesAndSpecimen=true&doResourceRelations=false&doReferences=true&withHigherClassification=false&includeHeader=true