RFC fetcher can't extract RFC title from some RFCs

[jschauma]

It looks like some RFCs use different markup from others, leading to the RFC fetcher to fail to extract the title.

For example, https://datatracker.ietf.org/doc/html/rfc3986 uses

<span class="h1">Uniform Resource Identifier (URI): Generic Syntax</span>  

and is successfully matched by

title = xml.xpath('string(//span[@class="h1"])')

but e.g., https://datatracker.ietf.org/doc/html/rfc9110 uses

<h1 id="title">HTTP Semantics</h1>

and is not matched.

It's possible that adding

if not title:
    title = xml.xpath('string(//h1[@id="title"])')

in https://github.com/sipb/chiron/blob/master/chiron_bot/fetchers.py fetch_rfc might help, but I didn't test this.

[richsalz]

If you use https://www.rfc-editor.org/info/rfcXXX as the URL, that has consistent formatting for all RFC metadata.

[richsalz]

(And the IETF considers rfc-editor.org the canonical site for published RFCs)

[jschauma]

Ah, yes, I thought we had talked about that before. :-)

#42