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- <TITLE>Uniform Resource Locator</TITLE>
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- <A HREF="topics.htm">Contents</A> / <A HREF="index.htm#TOP">Index</A>
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- <H2>What is a URL?</H2>
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- <HR>
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- <P>
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- A URL, or uniform resource locator, is the Internet address of a file. URLs are
- case sensitive. The most common syntax of a URL is:
-
- <P><B><I>protocol</I>://<I>machine</I>[:<I>port</I>]/<I>path</I>/<I>filename.html</I></B>
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- <P>
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- Where:
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- <TABLE>
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- <TR>
- <TD VALIGN="TOP"><I>protocol</I></TD>
- <TD VALIGN="TOP">the Internet protocol used to transmit the
- file. Examples of different protocols are shown below.</TD>
- </TR>
-
- <TR>
- <TD VALIGN="TOP"><I>machine</I></TD>
- <TD VALIGN="TOP">the domain name of the server where
- the file is stored (e.g. www.company.com).</TD>
- </TR>
-
- <TR>
- <TD VALIGN="TOP"><I>:port</I></TD>
- <TD VALIGN="TOP">only required when a non-standard TCP port number is
- used.</TD>
- </TR>
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- </TABLE>
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- <P>
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- Mosaic supports the following protocols:
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- <P>
- <TABLE>
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- <TR>
- <TH ALIGN="LEFT">Protocol</TH>
- <TH ALIGN="LEFT">Example</TH>
- </TR>
-
- <TR>
- <TD>Hypertext Transfer Protocol</TD>
- <TD><A
- HREF="http://www.ncsa.uiuc.edu/demoweb/url-primer.html">http://www.ncsa.uiuc.edu/demoweb/url-primer.html</A></TD>
- </TR>
-
- <TR>
- <TD>gopher</TD>
- <TD><A HREF="gopher://gopher.tc.umn.edu/">gopher://gopher.tc.umn.edu/</A>
- </TD>
- </TR>
-
- <TR>
- <TD>Usenet news</TD>
- <TD><A HREF="news:news.announce.newusers">news:news.announce.newusers</A></TD>
- </TR>
-
- <TR>
- <TD>File Transfer Protocol</TD>
- <TD><A HREF="ftp://ftp.cica.indiana.edu/">ftp://ftp.cica.indiana.edu/</A> </TD>
- </TR>
-
- <TR>
- <TD>Electronic mail address</TD>
- <TD><A HREF="mailto:someone@foo.com">mailto:someone@foo.com</A> (not a valid
- address)</TD>
- </TR>
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- </TABLE>
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