René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error code registry.","articleBody":"Right now if we get an unexpected GOAWAY we print this in the exception `hyper.http20.exceptions.ConnectionError: Encountered error 12, extra data b''.`. This is fine, but we can do better.\n\nWe should bring in the error code registry from the spec so that we can print something more like this: `hyper.http20.exceptions.ConnectionError: Error INADEQUATE_SECURITY (0xc): Negotiated TLS parameters not acceptable`.\n\nIdeally, the exception itself should be more structured, allowing easy access to numerical error codes, textual error names, long-form error descriptions, and the extra data.\n\nI suspect the format string is roughly going to be `\"Error {s:name} ({d:errno}): {s:long_error}\"`, where `long_error` is the extra data if it's available, and the description from the spec if it's not available.\n","author":{"url":"https://github.com/Lukasa","@type":"Person","name":"Lukasa"},"datePublished":"2015-04-11T15:00:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/119/hyper/issues/119"}