[Answer]-How to get username in request.GET Django

You should pass the username in the url as you are doing in other cases.

So your template would change to

<a href="/builds/request_sent/{{abuild.user.username}}">

urls.py would change to

 url(r'^request_sent/(?P<username>\w+)$', photo.views.friend_add),

And then view would change to

def friend_add(request, username):
    if 'username' in request.GET:
    ....