middleware: iterate over a copy of form keys when adding session variables (#36515)
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@ -63,7 +63,7 @@ class PublisherInitialisationMiddleware(object):
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query_string_allowed_vars.split(',')]
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had_session_variables = False
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session_variables = {}
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for k, v in compat_request.form.items():
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for k, v in list(compat_request.form.items()):
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if k.startswith('session_var_'):
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had_session_variables = True
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session_variable = str(k[len('session_var_'):])
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