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        <a href="web2py.gluon.validators-module.html">Module&nbsp;validators</a> ::
        Class&nbsp;IS_HTTP_URL
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class IS_HTTP_URL</h1><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_HTTP_URL">source&nbsp;code</a></span><br /><br />
<pre class="base-tree">
object --+    
         |    
 <a href="web2py.gluon.validators.Validator-class.html">Validator</a> --+
             |
            <strong class="uidshort">IS_HTTP_URL</strong>
</pre>

<hr />
<pre class="literalblock">

Rejects a URL string if any of the following is true:
   * The string is empty or None
   * The string uses characters that are not allowed in a URL
   * The string breaks any of the HTTP syntactic rules
   * The URL scheme specified (if one is specified) is not 'http' or 'https'
   * The top-level domain (if a host name is specified) does not exist

Based on RFC 2616: http://www.faqs.org/rfcs/rfc2616.html

This function only checks the URL's syntax. It does not check that the URL
points to a real document, for example, or that it otherwise makes sense
semantically. This function does automatically prepend 'http://' in front
of a URL in the case of an abbreviated URL (e.g. 'google.ca').

The list of allowed schemes is customizable with the allowed_schemes
parameter. If you exclude None from the list, then abbreviated URLs
(lacking a scheme such as 'http') will be rejected.

The default prepended scheme is customizable with the prepend_scheme
parameter. If you set prepend_scheme to None then prepending will be
disabled. URLs that require prepending to parse will still be accepted,
but the return value will not be modified.

@author: Jonathan Benn

&gt;&gt;&gt; IS_HTTP_URL()('http://1.2.3.4')
('http://1.2.3.4', None)
&gt;&gt;&gt; IS_HTTP_URL()('http://abc.com')
('http://abc.com', None)
&gt;&gt;&gt; IS_HTTP_URL()('https://abc.com')
('https://abc.com', None)
&gt;&gt;&gt; IS_HTTP_URL()('httpx://abc.com')
('httpx://abc.com', 'enter a valid URL')
&gt;&gt;&gt; IS_HTTP_URL()('http://abc.com:80')
('http://abc.com:80', None)
&gt;&gt;&gt; IS_HTTP_URL()('http://user@abc.com')
('http://user@abc.com', None)
&gt;&gt;&gt; IS_HTTP_URL()('http://user@1.2.3.4')
('http://user@1.2.3.4', None)

</pre><br /><br />

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          <td><span class="summary-sig"><a href="web2py.gluon.validators.IS_HTTP_URL-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
        <span class="summary-sig-arg">error_message</span>=<span class="summary-sig-default"><code class="variable-quote">'</code><code class="variable-string">enter a valid URL</code><code class="variable-quote">'</code></span>,
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      :param error_message: a string, the error message to give the end user
    if the URL does not validate
:param allowed_schemes: a list containing strings or None.</td>
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            <span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_HTTP_URL.__init__">source&nbsp;code</a></span>
            
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          <td><span class="summary-sig"><a href="web2py.gluon.validators.IS_HTTP_URL-class.html#__call__" class="summary-sig-name">__call__</a>(<span class="summary-sig-arg">self</span>,
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      :param value: a string, the URL to validate...</td>
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<a name="__init__"></a>
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  <h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
        <span class="sig-arg">error_message</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">enter a valid URL</code><code class="variable-quote">'</code></span>,
        <span class="sig-arg">allowed_schemes</span>=<span class="sig-default">1</span>,
        <span class="sig-arg">prepend_scheme</span>=<span class="sig-default"><code class="variable-quote">'</code><code class="variable-string">http</code><code class="variable-quote">'</code></span>)</span>
    <br /><em class="fname">(Constructor)</em>
  </h3>
  </td><td align="right" valign="top"
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  <pre class="literalblock">

:param error_message: a string, the error message to give the end user
    if the URL does not validate
:param allowed_schemes: a list containing strings or None. Each element
    is a scheme the inputed URL is allowed to use
:param prepend_scheme: a string, this scheme is prepended if it's
    necessary to make the URL valid

</pre>
  <dl class="fields">
    <dt>Overrides:
      object.__init__
    </dt>
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<a name="__call__"></a>
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        <span class="sig-arg">value</span>)</span>
    <br /><em class="fname">(Call operator)</em>
  </h3>
  </td><td align="right" valign="top"
    ><span class="codelink"><a href="web2py.gluon.validators-pysrc.html#IS_HTTP_URL.__call__">source&nbsp;code</a></span>&nbsp;
    </td>
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  <pre class="literalblock">

:param value: a string, the URL to validate
:returns: a tuple, where tuple[0] is the inputed value
    (possible prepended with prepend_scheme), and tuple[1] is either
    None (success!) or the string error_message

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