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On Mac OSX: "ValueError: Invalid header value" #3120
On Mac OS X 10.11.5, while running certbot-auto after entering an email address I receive the following error:
"ValueError: Invalid header value 'CertbotACMEClient/0.8.0 (darwin 10.11.5\n) Authenticator/apache Installer/apache'
The most recent logfile in that directory is letsencrypt.txt