Interpreting a Relative path in a URL -

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i'm writing 'webcrawler' in python takes url , depth-first search following links down limited depth. problem i'm having interpreting relative paths in urls.

on page http://learnyouahaskell.com/introduction/ have @ "starting out" link; looks <a href="starting-out" class="nxtlink">starting out</a>. how can determine whether link refers "http://learnyouahaskell.com/introduction/starting-out" or "http://learnyouahaskell.com/starting-out"? second 1 correct according browser.

yet on page http://math.colgate.edu/~mionescu/math399s11/ there link <a href="finalprojects.pdf">here</a> resolves "http://math.colgate.edu/~mionescu/math399s11/finalprojects.pdf".

can explain inconsistency me? how can determine how these paths should resolved in crawler?

the reason 'apparent' inconsistency learnyouahaskell site using <base href=""> tag in source. directs domainless hrefs use base starting point.

without base tag have appeared expected (the first link post) , acted math.colgate.edu link.


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