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<div class="highlight" style="background: #f8f8f8"><pre style="line-height: 125%"><div id="lc1"><span style="color: #408080; font-style: italic">#! /usr/bin/env python</span>
</div><div id="lc2"><span style="color: #408080; font-style: italic"># -*- coding: utf-8 -*-</span>
</div><div id="lc3"><span style="color: #008000; font-weight: bold">import</span> <span style="color: #0000FF; font-weight: bold">tornado.httpserver</span>
</div><div id="lc4"><span style="color: #008000; font-weight: bold">import</span> <span style="color: #0000FF; font-weight: bold">tornado.httpclient</span>
</div><div id="lc5"><span style="color: #008000; font-weight: bold">import</span> <span style="color: #0000FF; font-weight: bold">tornado.web</span>
</div><div id="lc6"><span style="color: #008000; font-weight: bold">import</span> <span style="color: #0000FF; font-weight: bold">tornado.options</span>
</div><div id="lc7">
</div><div id="lc8"><span style="color: #008000; font-weight: bold">from</span> <span style="color: #0000FF; font-weight: bold">adisp</span> <span style="color: #008000; font-weight: bold">import</span> async, process
</div><div id="lc9">
</div><div id="lc10"><span style="color: #008000; font-weight: bold">import</span> <span style="color: #0000FF; font-weight: bold">logging</span>
</div><div id="lc11">logging<span style="color: #666666">.</span>basicConfig()
</div><div id="lc12">log <span style="color: #666666">=</span> logging<span style="color: #666666">.</span>getLogger()
</div><div id="lc13">log<span style="color: #666666">.</span>setLevel(logging<span style="color: #666666">.</span>DEBUG)
</div><div id="lc14">
</div><div id="lc15"><span style="color: #008000; font-weight: bold">class</span> <span style="color: #0000FF; font-weight: bold">MainHandler</span>(tornado<span style="color: #666666">.</span>web<span style="color: #666666">.</span>RequestHandler):
</div><div id="lc16">    <span style="color: #AA22FF">@async</span>
</div><div id="lc17">    <span style="color: #008000; font-weight: bold">def</span> <span style="color: #0000FF">fetch</span>(<span style="color: #008000">self</span>, url, callback):
</div><div id="lc18">        http <span style="color: #666666">=</span> tornado<span style="color: #666666">.</span>httpclient<span style="color: #666666">.</span>AsyncHTTPClient()
</div><div id="lc19">        http<span style="color: #666666">.</span>fetch(url, <span style="color: #008000">self</span><span style="color: #666666">.</span>async_callback(callback))
</div><div id="lc20">
</div><div id="lc21">    <span style="color: #AA22FF">@tornado.web.asynchronous</span>
</div><div id="lc22">    <span style="color: #AA22FF">@process</span>
</div><div id="lc23">    <span style="color: #008000; font-weight: bold">def</span> <span style="color: #0000FF">get</span>(<span style="color: #008000">self</span>, url):
</div><div id="lc24">        response <span style="color: #666666">=</span> <span style="color: #008000; font-weight: bold">yield</span> <span style="color: #008000">self</span><span style="color: #666666">.</span>fetch(url)
</div><div id="lc25">        <span style="color: #008000; font-weight: bold">if</span> response<span style="color: #666666">.</span>error:
</div><div id="lc26">            <span style="color: #008000; font-weight: bold">raise</span> tornado<span style="color: #666666">.</span>web<span style="color: #666666">.</span>HTTPError(<span style="color: #666666">500</span>, <span style="color: #BA2121">&#39;Ooops&#39;</span>)
</div><div id="lc27">        <span style="color: #008000">self</span><span style="color: #666666">.</span>write(response<span style="color: #666666">.</span>body)
</div><div id="lc28">        <span style="color: #008000">self</span><span style="color: #666666">.</span>finish()
</div><div id="lc29">
</div><div id="lc30">application <span style="color: #666666">=</span> tornado<span style="color: #666666">.</span>web<span style="color: #666666">.</span>Application([
</div><div id="lc31">    (<span style="color: #BA2121">r&quot;/(.*)&quot;</span>, MainHandler),
</div><div id="lc32">])
</div><div id="lc33">
</div><div id="lc34"><span style="color: #008000; font-weight: bold">if</span> __name__ <span style="color: #666666">==</span> <span style="color: #BA2121">&quot;__main__&quot;</span>:
</div><div id="lc35">    http_server <span style="color: #666666">=</span> tornado<span style="color: #666666">.</span>httpserver<span style="color: #666666">.</span>HTTPServer(application)
</div><div id="lc36">    http_server<span style="color: #666666">.</span>listen(<span style="color: #666666">8888</span>)
</div><div id="lc37">    tornado<span style="color: #666666">.</span>ioloop<span style="color: #666666">.</span>IOLoop<span style="color: #666666">.</span>instance()<span style="color: #666666">.</span>start()
</div></pre></div>
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[color=#408080][i]#! /usr/bin/env python[/i][/color]
[color=#408080][i]# -*- coding: utf-8 -*-[/i][/color]
[color=#008000][b]import[/b][/color] [color=#0000FF][b]tornado.httpserver[/b][/color]
[color=#008000][b]import[/b][/color] [color=#0000FF][b]tornado.httpclient[/b][/color]
[color=#008000][b]import[/b][/color] [color=#0000FF][b]tornado.web[/b][/color]
[color=#008000][b]import[/b][/color] [color=#0000FF][b]tornado.options[/b][/color]

[color=#008000][b]from[/b][/color] [color=#0000FF][b]adisp[/b][/color] [color=#008000][b]import[/b][/color] async, process

[color=#008000][b]import[/b][/color] [color=#0000FF][b]logging[/b][/color]
logging[color=#666666].[/color]basicConfig()
log [color=#666666]=[/color] logging[color=#666666].[/color]getLogger()
log[color=#666666].[/color]setLevel(logging[color=#666666].[/color]DEBUG)

[color=#008000][b]class[/b][/color] [color=#0000FF][b]MainHandler[/b][/color](tornado[color=#666666].[/color]web[color=#666666].[/color]RequestHandler):
    [color=#AA22FF]@async[/color]
    [color=#008000][b]def[/b][/color] [color=#0000FF]fetch[/color]([color=#008000]self[/color], url, callback):
        http [color=#666666]=[/color] tornado[color=#666666].[/color]httpclient[color=#666666].[/color]AsyncHTTPClient()
        http[color=#666666].[/color]fetch(url, [color=#008000]self[/color][color=#666666].[/color]async_callback(callback))

[color=#AA22FF]@tornado.web.asynchronous[/color]
    [color=#AA22FF]@process[/color]
    [color=#008000][b]def[/b][/color] [color=#0000FF]get[/color]([color=#008000]self[/color], url):
        response [color=#666666]=[/color] [color=#008000][b]yield[/b][/color] [color=#008000]self[/color][color=#666666].[/color]fetch(url)
        [color=#008000][b]if[/b][/color] response[color=#666666].[/color]error:
            [color=#008000][b]raise[/b][/color] tornado[color=#666666].[/color]web[color=#666666].[/color]HTTPError([color=#666666]500[/color], [color=#BA2121]'Ooops'[/color])
        [color=#008000]self[/color][color=#666666].[/color]write(response[color=#666666].[/color]body)
        [color=#008000]self[/color][color=#666666].[/color]finish()

application [color=#666666]=[/color] tornado[color=#666666].[/color]web[color=#666666].[/color]Application([
    ([color=#BA2121]r"/(.*)"[/color], MainHandler),
])

[color=#008000][b]if[/b][/color] __name__ [color=#666666]==[/color] [color=#BA2121]"__main__"[/color]:
    http_server [color=#666666]=[/color] tornado[color=#666666].[/color]httpserver[color=#666666].[/color]HTTPServer(application)
    http_server[color=#666666].[/color]listen([color=#666666]8888[/color])
    tornado[color=#666666].[/color]ioloop[color=#666666].[/color]IOLoop[color=#666666].[/color]instance()[color=#666666].[/color]start()

--------------------------------------
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That method generates HTML with CSS classes. Hence you'll need the style sheet file

<div class="highlight"><pre><div id="lc1"><span class="c">#! /usr/bin/env python</span>
</div><div id="lc2"><span class="c"># -*- coding: utf-8 -*-</span>
</div><div id="lc3"><span class="kn">import</span> <span class="nn">tornado.httpserver</span>
</div><div id="lc4"><span class="kn">import</span> <span class="nn">tornado.httpclient</span>
</div><div id="lc5"><span class="kn">import</span> <span class="nn">tornado.web</span>
</div><div id="lc6"><span class="kn">import</span> <span class="nn">tornado.options</span>
</div><div id="lc7">
</div><div id="lc8"><span class="kn">from</span> <span class="nn">adisp</span> <span class="kn">import</span> <span class="n">async</span><span class="p">,</span> <span class="n">process</span>
</div><div id="lc9">
</div><div id="lc10"><span class="kn">import</span> <span class="nn">logging</span>
</div><div id="lc11"><span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">()</span>
</div><div id="lc12"><span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">()</span>
</div><div id="lc13"><span class="n">log</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">DEBUG</span><span class="p">)</span>
</div><div id="lc14">
</div><div id="lc15"><span class="k">class</span> <span class="nc">MainHandler</span><span class="p">(</span><span class="n">tornado</span><span class="o">.</span><span class="n">web</span><span class="o">.</span><span class="n">RequestHandler</span><span class="p">):</span>
</div><div id="lc16">    <span class="nd">@async</span>
</div><div id="lc17">    <span class="k">def</span> <span class="nf">fetch</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">url</span><span class="p">,</span> <span class="n">callback</span><span class="p">):</span>
</div><div id="lc18">        <span class="n">http</span> <span class="o">=</span> <span class="n">tornado</span><span class="o">.</span><span class="n">httpclient</span><span class="o">.</span><span class="n">AsyncHTTPClient</span><span class="p">()</span>
</div><div id="lc19">        <span class="n">http</span><span class="o">.</span><span class="n">fetch</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">async_callback</span><span class="p">(</span><span class="n">callback</span><span class="p">))</span>
</div><div id="lc20">
</div><div id="lc21">    <span class="nd">@tornado.web.asynchronous</span>
</div><div id="lc22">    <span class="nd">@process</span>
</div><div id="lc23">    <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">url</span><span class="p">):</span>
</div><div id="lc24">        <span class="n">response</span> <span class="o">=</span> <span class="k">yield</span> <span class="bp">self</span><span class="o">.</span><span class="n">fetch</span><span class="p">(</span><span class="n">url</span><span class="p">)</span>
</div><div id="lc25">        <span class="k">if</span> <span class="n">response</span><span class="o">.</span><span class="n">error</span><span class="p">:</span>
</div><div id="lc26">            <span class="k">raise</span> <span class="n">tornado</span><span class="o">.</span><span class="n">web</span><span class="o">.</span><span class="n">HTTPError</span><span class="p">(</span><span class="mi">500</span><span class="p">,</span> <span class="s">&#39;Ooops&#39;</span><span class="p">)</span>
</div><div id="lc27">        <span class="bp">self</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">body</span><span class="p">)</span>
</div><div id="lc28">        <span class="bp">self</span><span class="o">.</span><span class="n">finish</span><span class="p">()</span>
</div><div id="lc29">
</div><div id="lc30"><span class="n">application</span> <span class="o">=</span> <span class="n">tornado</span><span class="o">.</span><span class="n">web</span><span class="o">.</span><span class="n">Application</span><span class="p">([</span>
</div><div id="lc31">    <span class="p">(</span><span class="s">r&quot;/(.*)&quot;</span><span class="p">,</span> <span class="n">MainHandler</span><span class="p">),</span>
</div><div id="lc32"><span class="p">])</span>
</div><div id="lc33">
</div><div id="lc34"><span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span>
</div><div id="lc35">    <span class="n">http_server</span> <span class="o">=</span> <span class="n">tornado</span><span class="o">.</span><span class="n">httpserver</span><span class="o">.</span><span class="n">HTTPServer</span><span class="p">(</span><span class="n">application</span><span class="p">)</span>
</div><div id="lc36">    <span class="n">http_server</span><span class="o">.</span><span class="n">listen</span><span class="p">(</span><span class="mi">8888</span><span class="p">)</span>
</div><div id="lc37">    <span class="n">tornado</span><span class="o">.</span><span class="n">ioloop</span><span class="o">.</span><span class="n">IOLoop</span><span class="o">.</span><span class="n">instance</span><span class="p">()</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
</div></pre></div>
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<blockquote><code><font color="#408080"><em>#!&nbsp;/usr/bin/env&nbsp;python</em></font>
<font color="#408080"><em>#&nbsp;-*-&nbsp;coding:&nbsp;utf-8&nbsp;-*-</em></font>
<font color="#008000"><strong>import</strong></font>&nbsp;<font color="#0000FF"><strong>tornado.httpserver</strong></font>
<font color="#008000"><strong>import</strong></font>&nbsp;<font color="#0000FF"><strong>tornado.httpclient</strong></font>
<font color="#008000"><strong>import</strong></font>&nbsp;<font color="#0000FF"><strong>tornado.web</strong></font>
<font color="#008000"><strong>import</strong></font>&nbsp;<font color="#0000FF"><strong>tornado.options</strong></font>

<font color="#008000"><strong>from</strong></font>&nbsp;<font color="#0000FF"><strong>adisp</strong></font>&nbsp;<font color="#008000"><strong>import</strong></font>&nbsp;async,&nbsp;process

<font color="#008000"><strong>import</strong></font>&nbsp;<font color="#0000FF"><strong>logging</strong></font>
logging<font color="#666666">.</font>basicConfig()
log&nbsp;<font color="#666666">=</font>&nbsp;logging<font color="#666666">.</font>getLogger()
log<font color="#666666">.</font>setLevel(logging<font color="#666666">.</font>DEBUG)

<font color="#008000"><strong>class</strong></font>&nbsp;<font color="#0000FF"><strong>MainHandler</strong></font>(tornado<font color="#666666">.</font>web<font color="#666666">.</font>RequestHandler):
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#AA22FF">@async</font>
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>def</strong></font>&nbsp;<font color="#0000FF">fetch</font>(<font color="#008000">self</font>,&nbsp;url,&nbsp;callback):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;http&nbsp;<font color="#666666">=</font>&nbsp;tornado<font color="#666666">.</font>httpclient<font color="#666666">.</font>AsyncHTTPClient()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;http<font color="#666666">.</font>fetch(url,&nbsp;<font color="#008000">self</font><font color="#666666">.</font>async_callback(callback))

&nbsp;&nbsp;&nbsp;&nbsp;<font color="#AA22FF">@tornado.web.asynchronous</font>
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#AA22FF">@process</font>
&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>def</strong></font>&nbsp;<font color="#0000FF">get</font>(<font color="#008000">self</font>,&nbsp;url):
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response&nbsp;<font color="#666666">=</font>&nbsp;<font color="#008000"><strong>yield</strong></font>&nbsp;<font color="#008000">self</font><font color="#666666">.</font>fetch(url)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>if</strong></font>&nbsp;response<font color="#666666">.</font>error:
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000"><strong>raise</strong></font>&nbsp;tornado<font color="#666666">.</font>web<font color="#666666">.</font>HTTPError(<font color="#666666">500</font>,&nbsp;<font color="#BA2121">&#39;Ooops&#39;</font>)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000">self</font><font color="#666666">.</font>write(response<font color="#666666">.</font>body)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="#008000">self</font><font color="#666666">.</font>finish()

application&nbsp;<font color="#666666">=</font>&nbsp;tornado<font color="#666666">.</font>web<font color="#666666">.</font>Application([
&nbsp;&nbsp;&nbsp;&nbsp;(<font color="#BA2121">r&quot;/(.*)&quot;</font>,&nbsp;MainHandler),
])

<font color="#008000"><strong>if</strong></font>&nbsp;__name__&nbsp;<font color="#666666">==</font>&nbsp;<font color="#BA2121">&quot;__main__&quot;</font>:
&nbsp;&nbsp;&nbsp;&nbsp;http_server&nbsp;<font color="#666666">=</font>&nbsp;tornado<font color="#666666">.</font>httpserver<font color="#666666">.</font>HTTPServer(application)
&nbsp;&nbsp;&nbsp;&nbsp;http_server<font color="#666666">.</font>listen(<font color="#666666">8888</font>)
&nbsp;&nbsp;&nbsp;&nbsp;tornado<font color="#666666">.</font>ioloop<font color="#666666">.</font>IOLoop<font color="#666666">.</font>instance()<font color="#666666">.</font>start()
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