What does ‘URI has an authority component’ mean?

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An authority is a portion of a URI. Your error suggests that it was not expecting one. The authority section is shown below, it is what is known as the website part of the url.

From RFC3986 on URIs:

The following is an example URI and its component parts:

     foo://example.com:8042/over/there?name=ferret#nose
     \_/   \______________/\_________/ \_________/ \__/
      |           |            |            |        |
   scheme     authority       path        query   fragment
      |   _____________________|__
     / \ /                        \
     urn:example:animal:ferret:nose

So there are two formats, one with an authority and one not. Regarding slashes:

“When authority is not present, the path cannot begin with two slash
characters (“//”).”

Source: https://tools.ietf.org/rfc/rfc3986.txt (search for text ‘authority is not present, the path cannot begin with two slash‘)

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