web: guess a more robust default base url; validate --base-url #2212
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A followup to #2099, #2100 and #2127. Now relative links to js/css resources will use the same hostname etc. that the main page was requested from, making them work better when accessed via multiple IP addresses/hostnames without an explicit --base-url setting.
Also, --base-url's value must now begin with
http[s]://
; previously it accepted just a hostname, causing bad links.