Technically, it could be one HTTP request. He could convert the image data to base64 and use a data uri.

That won't work with all browsers. See http://caniuse.com/datauri. (Don't think that people have stopped using ancient IEs. And don't think that the browsers listed there are ALL browsers that exist.) Plus, it wastes a lot of bandwitdh, especially if the image is static. Using a classic HTTP(S) URL for the image allows the browser and all proxies between browser and server to cache the image, so it is transmitted only once, whereas the data URL "solution" sends the image for every request, with an additional overhead of 33% due to base64 encoding.

Alexander

--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

In reply to Re^3: CGI and image by afoken
in thread CGI and image by urizackhem

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.