title: URL works fine from browser or wget, but comes up empty from Python or cURL
body: <p>When I try to open <a href="http://www.comicbookdb.com/browse.php">http://www.comicbookdb.com/browse.php</a> (which works fine in my browser) from Python, I get an empty response:</p>
  
  <pre><code>&gt;&gt;&gt; import urllib.request
  &gt;&gt;&gt; content = urllib.request.urlopen('http://www.comicbookdb.com/browse.php')
  &gt;&gt;&gt; print(content.read())
  b''
  </code></pre>
  
  <p>The same also happens when I set a User-agent:</p>
  
  <pre><code>&gt;&gt;&gt; opener = urllib.request.build_opener()
  &gt;&gt;&gt; opener.addheaders = [('User-agent', 'Mozilla/5.0')]
  &gt;&gt;&gt; content = opener.open('http://www.comicbookdb.com/browse.php')
  &gt;&gt;&gt; print(content.read())
  b''
  </code></pre>
  
  <p>Or when I use httplib2 instead:</p>
  
  <pre><code>&gt;&gt;&gt; import httplib2
  &gt;&gt;&gt; h = httplib2.Http('.cache')
  &gt;&gt;&gt; response, content = h.request('http://www.comicbookdb.com/browse.php')
  &gt;&gt;&gt; print(content)
  b''
  &gt;&gt;&gt; print(response)
  {'cache-control': 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0', 'content-location': 'http://www.comicbookdb.com/browse.php', 'expires': 'Thu, 19 Nov 1981 08:52:00 GMT', 'content-length': '0', 'set-cookie': 'PHPSESSID=590f5997a91712b7134c2cb3291304a8; path=/', 'date': 'Wed, 25 Dec 2013 15:12:30 GMT', 'server': 'Apache', 'pragma': 'no-cache', 'content-type': 'text/html', 'status': '200'}
  </code></pre>
  
  <p>Or when I try to download it using cURL:</p>
  
  <pre><code>C:\&gt;curl -v http://www.comicbookdb.com/browse.php
  * About to connect() to www.comicbookdb.com port 80
  *   Trying 208.76.81.137... * connected
  * Connected to www.comicbookdb.com (208.76.81.137) port 80
  &gt; GET /browse.php HTTP/1.1
  User-Agent: curl/7.13.1 (i586-pc-mingw32msvc) libcurl/7.13.1 zlib/1.2.2
  Host: www.comicbookdb.com
  Pragma: no-cache
  Accept: */*
  
  &lt; HTTP/1.1 200 OK
  &lt; Date: Wed, 25 Dec 2013 15:20:06 GMT
  &lt; Server: Apache
  &lt; Expires: Thu, 19 Nov 1981 08:52:00 GMT
  &lt; Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
  &lt; Pragma: no-cache
  &lt; Set-Cookie: PHPSESSID=0a46f2d390639da7eb223ad47380b394; path=/
  &lt; Content-Length: 0
  &lt; Content-Type: text/html
  * Connection #0 to host www.comicbookdb.com left intact
  * Closing connection #0
  </code></pre>
  
  <p>Opening the URL in a browser or downloading it with Wget seems to work fine, though:</p>
  
  <pre><code>C:\&gt;wget http://www.comicbookdb.com/browse.php
  --16:16:26--  http://www.comicbookdb.com/browse.php
             =&gt; `browse.php'
  Resolving www.comicbookdb.com... 208.76.81.137
  Connecting to www.comicbookdb.com[208.76.81.137]:80... connected.
  HTTP request sent, awaiting response... 200 OK
  Length: unspecified [text/html]
  
      [    &lt;=&gt;                              ] 40,687        48.75K/s
  
  16:16:27 (48.75 KB/s) - `browse.php' saved [40687]
  </code></pre>
  
  <p>As does downloading a different file from the same server:</p>
  
  <pre><code>&gt;&gt;&gt; content = urllib.request.urlopen('http://www.comicbookdb.com/index.php')
  &gt;&gt;&gt; print(content.read(100))
  b'&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"\n\t\t"http://www.w3.org/TR/1999/REC-html'
  </code></pre>
  
  <p>So why doesn't the other URL work?</p>