Full disclosure: I didn't bother to learn about why the ; is being split. But I can hasten a guess: the python web server treats that as a parameter separator.

Full disclosure: I didn't bother to learn about why the ; is being split. But I can hasten a guess: the python web server treats that as a parameter separator. ... and confirmed. [1] https://www.google.com/webhp?q=webapp.WSGIApplication+semicolon https://www.google.com/webhp?q=webapp.WSGIApplication+semico... [2] https://groups.google.com/forum/#!topic/google-appengine/Aai8ShndteA https://groups.google.com/forum/#!topic/google-appengine/Aai... [3] https://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.2.2 https://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.2.2