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In https://github.com/cherrypy/cherrypy/pull/1807, I discovered that there is already a fairly straightforward means for a third-party package to override the putrequest character validation (just monkeypatch http.client._contains_disallowed_url_pchar_re with a less strict pattern; I used `[\n]`). This approach is barely worse than the proposal I made in the PR, the main differences being that a monkeypatch of that global variable is global (not selective to specific instances or subclasses of HTTPConnection) and doesn't have any tests in the CPython test suite to protect that as a supported mechanism.