Flask Optional Url Parameter Not Working

@mod.route('/participate//', defaults = {'work_id':None}, methods = ['GET','POST']) @mod.route('/pariicipate//', methods = ['GET',

Solution 1:

Your second route has a typo in it :)

@mod.route('/pariicipate/<survey_id>/<work_id>', methods = ['GET', 'POST'])

should be

@mod.route('/participate/<survey_id>/<work_id>', methods = ['GET', 'POST'])