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<section id="module-urllib.error">
<span id="urllib-error-exception-classes-raised-by-urllib-request"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.error</span></code> — Exception classes raised by urllib.request<a class="headerlink" href="#module-urllib.error" title="Link to this heading"></a></h1>
<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/urllib/error.py">Lib/urllib/error.py</a></p>
<hr class="docutils" />
<p>The <a class="reference internal" href="#module-urllib.error" title="urllib.error: Exception classes raised by urllib.request."><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.error</span></code></a> module defines the exception classes for exceptions
raised by <a class="reference internal" href="urllib.request.html#module-urllib.request" title="urllib.request: Extensible library for opening URLs."><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.request</span></code></a>. The base exception class is <a class="reference internal" href="#urllib.error.URLError" title="urllib.error.URLError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">URLError</span></code></a>.</p>
<p>The following exceptions are raised by <a class="reference internal" href="#module-urllib.error" title="urllib.error: Exception classes raised by urllib.request."><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.error</span></code></a> as appropriate:</p>
<dl class="py exception">
<dt class="sig sig-object py" id="urllib.error.URLError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">urllib.error.</span></span><span class="sig-name descname"><span class="pre">URLError</span></span><a class="headerlink" href="#urllib.error.URLError" title="Link to this definition"></a></dt>
<dd><p>The handlers raise this exception (or derived exceptions) when they run into
a problem. It is a subclass of <a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a>.</p>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.URLError.reason">
<span class="sig-name descname"><span class="pre">reason</span></span><a class="headerlink" href="#urllib.error.URLError.reason" title="Link to this definition"></a></dt>
<dd><p>The reason for this error. It can be a message string or another
exception instance.</p>
</dd></dl>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.3: </span><a class="reference internal" href="#urllib.error.URLError" title="urllib.error.URLError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">URLError</span></code></a> used to be a subtype of <a class="reference internal" href="exceptions.html#IOError" title="IOError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a>, which is now an
alias of <a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a>.</p>
</div>
</dd></dl>
<dl class="py exception">
<dt class="sig sig-object py" id="urllib.error.HTTPError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">urllib.error.</span></span><span class="sig-name descname"><span class="pre">HTTPError</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">url</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">code</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">msg</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">hdrs</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fp</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#urllib.error.HTTPError" title="Link to this definition"></a></dt>
<dd><p>Though being an exception (a subclass of <a class="reference internal" href="#urllib.error.URLError" title="urllib.error.URLError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">URLError</span></code></a>), an
<a class="reference internal" href="#urllib.error.HTTPError" title="urllib.error.HTTPError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">HTTPError</span></code></a> can also function as a non-exceptional file-like return
value (the same thing that <a class="reference internal" href="urllib.request.html#urllib.request.urlopen" title="urllib.request.urlopen"><code class="xref py py-func docutils literal notranslate"><span class="pre">urlopen()</span></code></a> returns). This
is useful when handling exotic HTTP errors, such as requests for
authentication.</p>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.HTTPError.url">
<span class="sig-name descname"><span class="pre">url</span></span><a class="headerlink" href="#urllib.error.HTTPError.url" title="Link to this definition"></a></dt>
<dd><p>Contains the request URL.
An alias for <em>filename</em> attribute.</p>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.HTTPError.code">
<span class="sig-name descname"><span class="pre">code</span></span><a class="headerlink" href="#urllib.error.HTTPError.code" title="Link to this definition"></a></dt>
<dd><p>An HTTP status code as defined in <span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2616.html"><strong>RFC 2616</strong></a>. This numeric value corresponds
to a value found in the dictionary of codes as found in
<a class="reference internal" href="http.server.html#http.server.BaseHTTPRequestHandler.responses" title="http.server.BaseHTTPRequestHandler.responses"><code class="xref py py-attr docutils literal notranslate"><span class="pre">http.server.BaseHTTPRequestHandler.responses</span></code></a>.</p>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.HTTPError.reason">
<span class="sig-name descname"><span class="pre">reason</span></span><a class="headerlink" href="#urllib.error.HTTPError.reason" title="Link to this definition"></a></dt>
<dd><p>This is usually a string explaining the reason for this error.
An alias for <em>msg</em> attribute.</p>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.HTTPError.headers">
<span class="sig-name descname"><span class="pre">headers</span></span><a class="headerlink" href="#urllib.error.HTTPError.headers" title="Link to this definition"></a></dt>
<dd><p>The HTTP response headers for the HTTP request that caused the
<a class="reference internal" href="#urllib.error.HTTPError" title="urllib.error.HTTPError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">HTTPError</span></code></a>.
An alias for <em>hdrs</em> attribute.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.4.</span></p>
</div>
</dd></dl>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.HTTPError.fp">
<span class="sig-name descname"><span class="pre">fp</span></span><a class="headerlink" href="#urllib.error.HTTPError.fp" title="Link to this definition"></a></dt>
<dd><p>A file-like object where the HTTP error body can be read from.</p>
</dd></dl>
</dd></dl>
<dl class="py exception">
<dt class="sig sig-object py" id="urllib.error.ContentTooShortError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">urllib.error.</span></span><span class="sig-name descname"><span class="pre">ContentTooShortError</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">msg</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">content</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#urllib.error.ContentTooShortError" title="Link to this definition"></a></dt>
<dd><p>This exception is raised when the <a class="reference internal" href="urllib.request.html#urllib.request.urlretrieve" title="urllib.request.urlretrieve"><code class="xref py py-func docutils literal notranslate"><span class="pre">urlretrieve()</span></code></a>
function detects that
the amount of the downloaded data is less than the expected amount (given by
the <em>Content-Length</em> header).</p>
<dl class="py attribute">
<dt class="sig sig-object py" id="urllib.error.ContentTooShortError.content">
<span class="sig-name descname"><span class="pre">content</span></span><a class="headerlink" href="#urllib.error.ContentTooShortError.content" title="Link to this definition"></a></dt>
<dd><p>The downloaded (and supposedly truncated) data.</p>
</dd></dl>
</dd></dl>
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