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As had already been pointed out in a deleted answer, your problem are the entries
'wsgi.input': <socket._fileobject object at 0x112519cd0>
'wsgi.errors': <open file '<stderr>', mode 'w' at 0x10f4891e0>
'wsgi.file_wrapper': <class wsgiref.util.FileWrapper at 0x110994258>
Remove these and
ast.literal_eval(header_data)
should work.
Source:stackexchange.com