python - GAE - Issue with GET -

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i'm trying make basic sign form on google app engine redirects , writes 'welcome, (name_of_user)' when input valid. seems i'm having problem last function. redirect page shows 'welcome, '. code appreciated. thank you. http://pastebin.com/jtsrxkpb

please take few minutes , learn how put code in posts it'll part of permanent record of question.

in welcomehandler,

user = self.request.get('username')

has no query parameter named username, since self.redirect("/welcome") isn't passing one. try

self.redirect("/welcome?username=something")

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