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Reported by Björn Höhrmann: I just hit the "Validate File..." button without entering something into the form and got back: Sorry, this type of URI (undefined) is not supported by this service. Please check that you entered the URI correctly. URIs should be in the form: http://validator.w3.org/ If you entered a valid URI using a scheme that we should support, please let us know as outlined on our Feedback page. Make sure to include the specific URI you would like us to support, and if possible provide a reference to the relevant standards document describing the URI scheme in question. If I enter something into the "Address" field and click "Validate File...", I get the same response, as well as when specifying a file and clicking "Validate URI...".
To avoid collisions, I think it's best to leave this one alone until bug #3 has been closed.
Changed the two FORMs on index.html into a single POST form. Since we now redirect to a GETable resource when there is no file upload, this should still result in a bookmarkable/GETable result page unless you upload a file. There is still an unresolved issue if you choose a file and then change your mind and enter an URI. The file upload will be preferred and validated, which may be unexpected. Leaving it as a separate issue for now.