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class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/urllib/error.py">Lib/urllib/error.py</a></p>210<hr class="docutils" />211<p>The <code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.error</span></code> module defines the exception classes for exceptions212raised 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>213<p>The following exceptions are raised by <code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.error</span></code> as appropriate:</p>214<dl class="py exception">215<dt class="sig sig-object py" id="urllib.error.URLError">216<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>217<dd><p>The handlers raise this exception (or derived exceptions) when they run into218a 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>219<dl class="py attribute">220<dt class="sig sig-object py" id="urllib.error.URLError.reason">221<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>222<dd><p>The reason for this error.  It can be a message string or another223exception instance.</p>224</dd></dl>225 226<div class="versionchanged">227<p><span class="versionmodified changed">Changed in version 3.3: </span><code class="xref py py-exc docutils literal notranslate"><span class="pre">URLError</span></code> 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 an228alias 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>229</div>230</dd></dl>231 232<dl class="py exception">233<dt class="sig sig-object py" id="urllib.error.HTTPError">234<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>235<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>), an236<code class="xref py py-exc docutils literal notranslate"><span class="pre">HTTPError</span></code> can also function as a non-exceptional file-like return237value (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).  This238is useful when handling exotic HTTP errors, such as requests for239authentication.</p>240<dl class="py attribute">241<dt class="sig sig-object py" id="urllib.error.HTTPError.url">242<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>243<dd><p>Contains the request URL.244An alias for <em>filename</em> attribute.</p>245</dd></dl>246 247<dl class="py attribute">248<dt class="sig sig-object py" id="urllib.error.HTTPError.code">249<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>250<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 corresponds251to a value found in the dictionary of codes as found in252<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>253</dd></dl>254 255<dl class="py attribute">256<dt class="sig sig-object py" id="urllib.error.HTTPError.reason">257<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>258<dd><p>This is usually a string explaining the reason for this error.259An alias for <em>msg</em> attribute.</p>260</dd></dl>261 262<dl class="py attribute">263<dt class="sig sig-object py" id="urllib.error.HTTPError.headers">264<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>265<dd><p>The HTTP response headers for the HTTP request that caused the266<code class="xref py py-exc docutils literal notranslate"><span class="pre">HTTPError</span></code>.267An alias for <em>hdrs</em> attribute.</p>268<div class="versionadded">269<p><span class="versionmodified added">Added in version 3.4.</span></p>270</div>271</dd></dl>272 273<dl class="py attribute">274<dt class="sig sig-object py" id="urllib.error.HTTPError.fp">275<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>276<dd><p>A file-like object where the HTTP error body can be read from.</p>277</dd></dl>278 279</dd></dl>280 281<dl class="py exception">282<dt class="sig sig-object py" id="urllib.error.ContentTooShortError">283<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>284<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>285function detects that286the amount of the downloaded data is less than the expected amount (given by287the <em>Content-Length</em> header).</p>288<dl class="py attribute">289<dt class="sig sig-object py" id="urllib.error.ContentTooShortError.content">290<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>291<dd><p>The downloaded (and supposedly truncated) data.</p>292</dd></dl>293 294</dd></dl>295 296</section>297 298 299            <div class="clearer"></div>300          </div>301        </div>302      </div>303      <div class="sphinxsidebar" role="navigation" aria-label="Main">304        <div class="sphinxsidebarwrapper">305  <div>306    <h4>Previous topic</h4>307    <p class="topless"><a href="urllib.parse.html"308                          title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">urllib.parse</span></code> — Parse URLs into components</a></p>309  </div>310  <div>311    <h4>Next topic</h4>312    <p class="topless"><a href="urllib.robotparser.html"313                          title="next 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