A full URL forces the browser to revisit DNS? Where did you get that idea? Even if you have some wacky set-up where you aren't caching replies, it doesn't affect rendering. As for needless traffic, a DNS query isn't much compared to all those images we ask our browser to download.

Relative URLs are a convenience for our typing. To follow a link, the browser still needs to make it an absolute URL, then go where that URL says. A relative URL in an HTML page is not a secret signal to the browser to use some sort of quick fetching algorithm.

You might be thinking about the difference between external and internal redirections. An external redirection is a full HTTP response that cause the user-agent to fetch the resource from a different URL. An internal redirection can be caught by the web server and handled without another request from the user-agent. Neither of these have anything to do with HTML though.

--
brian d foy <bdfoy@cpan.org>

In reply to Re^2: Creating a web crawler (theory) by brian_d_foy
in thread Creating a web crawler (theory) by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.