(eplain.info)URL hyperlinks

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5.3.2 URL hyperlinks: url
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The 'url' linkgroup covers the '\url' command from the LaTeX package
'url' (Note: Packages known to work), as well as any new '\url'-like
commands you define. The type for this linkgroup is set to 'url' by the
drivers which support this link type. 'url' links use the parameter to
the '\url' command as the URL to point to.

   You may be using the '\url' command to typeset something other than a
URL, e.g., a path, for which you do not want a link to be created; in
that case, you can disable the 'url' linkgroup with the command
'\hloff[url]' (Note: Turning hyperlinks on/off for a group).

   By default, URL (and other types of) links are boxed, so that they
are visually marked even if you do not load the LaTeX 'color' package
(Note: Loading LaTeX packages) and therefore link text is not colored.
You can see the effect by compiling the following code snippet (be sure
to get a modern 'url.sty', older versions do not work in plain TeX;
Note: Packages known to work):

     \input eplain
     \beginpackages
       \usepackage{url}
     \endpackages

     \enablehyperlinks

     \url{http://foo/bar}

     \url{mailto:foobar@example.org}

     \bye

   If the hyperlink driver you use supports the link option 'bwidth'
(Note: Hyperlink drivers), you can produce colored links with no
border around them. Try this:

     \input eplain
     \beginpackages
       \usepackage{url}
       \usepackage{color}
     \endpackages

     \enablehyperlinks
     \hlopts{bwidth=0}

     \url{http://foo/bar}

     \url{mailto:foobar@example.org}

     \bye

The command '\hlopts{bwidth=0}' sets border width to zero as the default
for all links, and loading the 'color' package automatically colors
links using the default color (Note: Options supported by all
drivers). If you want the border width setting to apply to URL links
only, say '\hlopts[url]{bwidth=0}' (Note: Setting hyperlink types and
options).