common.html

perl教程

<pre>
  name=Gisle%20Aas&amp;email=gisle%40aas.no&amp;gender=M&amp;born=1964&amp;perc=3%25</pre>
</dd>
<dd>
<p>Multivalued form fields can be specified by either repeating the field
name or by passing the value as an array reference.</p>
</dd>
<dd>
<p>The POST method also supports the <code>multipart/form-data</code> content used
for <em>Form-based File Upload</em> as specified in RFC 1867.  You trigger
this content format by specifying a content type of <code>'form-data'</code> as
one of the request headers.  If one of the values in the $form_ref is
an array reference, then it is treated as a file part specification
with the following interpretation:</p>
</dd>
<dd>
<pre>
  [ $file, $filename, Header =&gt; Value... ]
  [ undef, $filename, Header =&gt; Value,..., Content =&gt; $content ]</pre>
</dd>
<dd>
<p>The first value in the array ($file) is the name of a file to open.
This file will be read and its content placed in the request.  The
routine will croak if the file can't be opened.  Use an <a href="../../../lib/Pod/perlfunc.html#item_undef"><code>undef</code></a> as
$file value if you want to specify the content directly with a
<code>Content</code> header.  The $filename is the filename to report in the
request.  If this value is undefined, then the basename of the $file
will be used.  You can specify an empty string as $filename if you
want to suppress sending the filename when you provide a $file value.</p>
</dd>
<dd>
<p>If a $file is provided by no <code>Content-Type</code> header, then <code>Content-Type</code>
and <code>Content-Encoding</code> will be filled in automatically with the values
returned by LWP::MediaTypes::guess_media_type()</p>
</dd>
<dd>
<p>Sending my <em>~/.profile</em> to the survey used as example above can be
achieved by this:</p>
</dd>
<dd>
<pre>
  <span class="variable">POST</span> <span class="string">'http://www.perl.org/survey.cgi'</span><span class="operator">,</span>
       <span class="string">Content_Type</span> <span class="operator">=&gt;</span> <span class="string">'form-data'</span><span class="operator">,</span>
       <span class="string">Content</span>      <span class="operator">=&gt;</span> <span class="operator">[</span> <span class="string">name</span>  <span class="operator">=&gt;</span> <span class="string">'Gisle Aas'</span><span class="operator">,</span>
                         <span class="string">email</span> <span class="operator">=&gt;</span> <span class="string">'[e-mail]'</span><span class="operator">,</span>
                         <span class="string">gender</span> <span class="operator">=&gt;</span> <span class="string">'M'</span><span class="operator">,</span>
                         <span class="string">born</span>   <span class="operator">=&gt;</span> <span class="string">'1964'</span><span class="operator">,</span>
                         <span class="string">init</span>   <span class="operator">=&gt;</span> <span class="operator">[</span><span class="string">"$ENV{HOME}/.profile"</span><span class="operator">]</span><span class="operator">,</span>
                       <span class="operator">]</span>
</pre>
</dd>
<dd>
<p>This will create a HTTP::Request object that almost looks this (the
boundary and the content of your <em>~/.profile</em> is likely to be
different):</p>
</dd>
<dd>
<pre>
  <span class="variable">POST</span> <span class="variable">http</span><span class="operator">:</span><span class="regex">//www</span><span class="operator">.</span><span class="variable">perl</span><span class="operator">.</span><span class="variable">org</span><span class="operator">/</span><span class="variable">survey</span><span class="operator">.</span><span class="variable">cgi</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Length</span><span class="operator">:</span> <span class="number">388</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Type</span><span class="operator">:</span> <span class="variable">multipart</span><span class="operator">/</span><span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">boundary</span><span class="operator">=</span><span class="string">"6G+f"</span>
</pre>
</dd>
<dd>
<pre>
  <span class="operator">--</span><span class="number">6</span><span class="variable">G</span><span class="operator">+</span><span class="variable">f</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Disposition</span><span class="operator">:</span> <span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">name</span><span class="operator">=</span><span class="string">"name"</span>
</pre>
</dd>
<dd>
<pre>
  <span class="variable">Gisle</span> <span class="variable">Aas</span>
  <span class="operator">--</span><span class="number">6</span><span class="variable">G</span><span class="operator">+</span><span class="variable">f</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Disposition</span><span class="operator">:</span> <span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">name</span><span class="operator">=</span><span class="string">"email"</span>
</pre>
</dd>
<dd>
<pre>
  <span class="variable">gisle</span><span class="variable">@aas</span><span class="operator">.</span><span class="keyword">no</span>
  <span class="operator">--</span><span class="number">6</span><span class="variable">G</span><span class="operator">+</span><span class="variable">f</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Disposition</span><span class="operator">:</span> <span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">name</span><span class="operator">=</span><span class="string">"gender"</span>
</pre>
</dd>
<dd>
<pre>
  <span class="variable">M</span>
  <span class="operator">--</span><span class="number">6</span><span class="variable">G</span><span class="operator">+</span><span class="variable">f</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Disposition</span><span class="operator">:</span> <span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">name</span><span class="operator">=</span><span class="string">"born"</span>
</pre>
</dd>
<dd>
<pre>
  <span class="number">1964</span>
  <span class="operator">--</span><span class="number">6</span><span class="variable">G</span><span class="operator">+</span><span class="variable">f</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Disposition</span><span class="operator">:</span> <span class="variable">form</span><span class="operator">-</span><span class="variable">data</span><span class="operator">;</span> <span class="variable">name</span><span class="operator">=</span><span class="string">"init"</span><span class="operator">;</span> <span class="variable">filename</span><span class="operator">=</span><span class="string">".profile"</span>
  <span class="variable">Content</span><span class="operator">-</span><span class="variable">Type</span><span class="operator">:</span> <span class="variable">text</span><span class="operator">/</span><span class="variable">plain</span>
</pre>
</dd>
<dd>
<pre>
  PATH=/local/perl/bin:$PATH
  export PATH</pre>
</dd>
<dd>
<pre>
  --6G+f--</pre>
</dd>
<dd>
<p>If you set the $DYNAMIC_FILE_UPLOAD variable (exportable) to some TRUE
value, then you get back a request object with a subroutine closure as
the content attribute.  This subroutine will read the content of any
files on demand and return it in suitable chunks.  This allow you to
upload arbitrary big files without using lots of memory.  You can even
upload infinite files like <em>/dev/audio</em> if you wish; however, if
the file is not a plain file, there will be no Content-Length header
defined for the request.  Not all servers (or server
applications) like this.  Also, if the <code>file(s)</code> change in size between
the time the Content-Length is calculated and the time that the last
chunk is delivered, the subroutine will <code>Croak</code>.</p>
</dd>
<dd>
<p>The <code>post(...)</code>  method of &quot;LWP::UserAgent&quot; exists as a shortcut for
$ua-&gt;request(POST ...).</p>
</dd>
</li>
</dl>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><a href="../../../lib/HTTP/Request.html">the HTTP::Request manpage</a>, <a href="../../../lib/LWP/UserAgent.html">the LWP::UserAgent manpage</a></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 1997-2004, Gisle Aas</p>
<p>This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.</p>

</body>

</html>