Client issues request via a URL:
(Universial Resource Locator)

URLs take this form:

• Methods: http:, ftp:, gopher:, mailto:, file:, etc.

• Address specifies machine (e.g., www.geom.umn.edu)

• File names are relative either to:
  • The server root (e.g., /u/www/root), or
  • Someone's public_html directory (e.g., /~scheftic/)

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