18.24.6 ProtocolError Objects
A ProtocolError object describes a protocol error in the underlying transport layer (such as a 404 `not found' error if the server named by the URI does not exist). It has the following members:
- The URI or URL that triggered the error.
- The error code.
- The error message or diagnostic string.
- A string containing the headers of the HTTP/HTTPS request that triggered the error.
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