If the OpenID response is too big, the default python-openid server will tell us it still needs Redirect encoding, even if that won't fit anymore.
We should probably do something smart and override python-openid's encoding decision in that case.
Overriding the encoding decision is not going to work, since most RP implementations will just not accept it.
Metadata Update from @puiterwijk:
- Issue assigned to puiterwijk
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