Curl: What Url could cause "CURLE_URL_MALFORMAT"? -

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for testing purpose, need feed curl wrong url trigger "curle_url_malformat" error. no matter how try, couldn't make happen. error cannot resolve host, or unsupported protocol etc. tip.

searching curl sources leads to... multiple tests supposed trigger same error. example,

pop3://host:port/%0d%0a/1322

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