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you wouldn't believe me if I told you
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Mark Pilgrim
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@@ -30,7 +30,7 @@ mark{display:inline}
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<li><a href=http://code.google.com/apis/gdata/>Google Data <abbr>API</abbr>s</a> allow you to interact with a wide variety of Google services, including <a href=http://www.blogger.com/>Blogger</a> and <a href=http://www.youtube.com/>YouTube</a>.
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<li><a href=http://www.flickr.com/services/api/>Flickr Services</a> allow you to upload and download photos from <a href=http://www.flickr.com/>Flickr</a>.
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<li><a href=http://apiwiki.twitter.com/>Twitter <abbr>API</abbr></a> allows you to publish status updates on <a href=http://twitter.com/>Twitter</a>.
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<li><a href="http://www.programmableweb.com/apis/directory/1?sort=mashups">…and many more</a>
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<li><a href='http://www.programmableweb.com/apis/directory/1?sort=mashups'>…and many more</a>
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</ul>
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<p>Python 3 comes with two different libraries for interacting with <abbr>HTTP</abbr> web services:
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@@ -153,7 +153,7 @@ Cache-Control: max-age=31536000, public</samp></pre>
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<h3 id=compression>Compression</h3>
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<p>When you talk about <abbr>HTTP</abbr> web services, you’re almost always talking about moving text-based data back and forth over the wire. Maybe it’s <abbr>XML</abbr>, maybe it’s <abbr>JSON</abbr>, maybe it’s just <a href=strings.html#boring-stuff title="there ain’t no such thing as plain text">plain text</a>. Regardless of the format, text compresses well. The example feed in <a href=xml.html>the XML chapter</a> is 3070 bytes uncompressed, but would be 941 bytes after gzip compression. That’s just 30% of the original size!
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<p>When you talk about <abbr>HTTP</abbr> web services, you’re almost always talking about moving text-based data back and forth over the wire. Maybe it’s <abbr>XML</abbr>, maybe it’s <abbr>JSON</abbr>, maybe it’s just <a href=strings.html#boring-stuff title='there ain’t no such thing as plain text'>plain text</a>. Regardless of the format, text compresses well. The example feed in <a href=xml.html>the XML chapter</a> is 3070 bytes uncompressed, but would be 941 bytes after gzip compression. That’s just 30% of the original size!
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<p><abbr>HTTP</abbr> supports several compression algorithms. The two most common types are <a href=http://www.ietf.org/rfc/rfc1952.txt>gzip</a> and <a href=http://www.ietf.org/rfc/rfc1951.txt>deflate</a>. When you request a resource over <abbr>HTTP</abbr>, you can ask the server to send it in compressed format. You include an <code>Accept-encoding</code> header in your request that lists which compression algorithms you support. If the server supports any of the same algorithms, it will send you back compressed data (with a <code>Content-encoding</code> header that tells you which algorithm it used). Then it’s up to you to decompress the data.
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@@ -190,13 +190,13 @@ Cache-Control: max-age=31536000, public</samp></pre>
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<samp class=p>>>> </samp><kbd>import urllib.request</kbd>
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<a><samp class=p>>>> </samp><kbd>data = urllib.request.urlopen('http://diveintopython3.org/examples/feed.xml').read()</kbd> <span>①</span></a>
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<samp class=p>>>> </samp><kbd>print(data)</kbd>
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<samp><?xml version="1.0" encoding="utf-8"?>
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<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
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<samp><?xml version='1.0' encoding='utf-8'?>
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<feed xmlns='http://www.w3.org/2005/Atom' xml:lang='en'>
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<title>dive into mark</title>
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<subtitle>currently between addictions</subtitle>
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<id>tag:diveintomark.org,2001-07-29:/</id>
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<updated>2009-03-27T21:56:07Z</updated>
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<link rel="alternate" type="text/html" href="http://diveintomark.org/"/>
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<link rel='alternate' type='text/html' href='http://diveintomark.org/'/>
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…
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</samp></pre>
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<ol>
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@@ -320,7 +320,7 @@ Content-Type: application/xml</samp>
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<samp class=p>>>> </samp><kbd>response.status</kbd>
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<samp>200</samp>
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<samp class=p>>>> </samp><kbd>content[:52]</kbd>
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<samp>b'<?xml version="1.0" encoding="utf-8"?>\r\n<feed xmlns='</samp>
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<samp>b"<?xml version='1.0' encoding='utf-8'?>\r\n<feed xmlns="</samp>
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<samp class=p>>>> </samp><kbd>len(content)</kbd>
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<samp>3070</samp></pre>
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<ol>
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@@ -337,7 +337,7 @@ Content-Type: application/xml</samp>
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<samp class=p>>>> </samp><kbd>response2.status</kbd>
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<samp>200</samp>
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<samp class=p>>>> </samp><kbd>content2[:52]</kbd>
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<samp>b'<?xml version="1.0" encoding="utf-8"?>\r\n<feed xmlns='</samp>
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<samp>b"<?xml version='1.0' encoding='utf-8'?>\r\n<feed xmlns="</samp>
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<samp class=p>>>> </samp><kbd>len(content2)</kbd>
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<samp>3070</samp></pre>
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<ol>
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@@ -551,9 +551,9 @@ reply: 'HTTP/1.1 301 Moved Permanently'</samp>
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<samp class=p>>>> </samp><kbd>import httplib2</kbd>
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<samp class=p>>>> </samp><kbd>from urllib.parse import urlencode</kbd>
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<samp class=p>>>> </samp><kbd>h = httplib2.Http('.cache')</kbd>
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<samp class=p>>>> </samp><kbd>data = {"status": "Test update from Python 3"}</kbd>
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<samp class=p>>>> </samp><kbd>h.add_credentials("diveintomark", "<var>MY_SECRET_PASSWORD</var>")</kbd>
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<samp class=p>>>> </samp><kbd>resp, content = h.request("http://twitter.com/statuses/update.xml", "POST", urlencode(data))</kbd>
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<samp class=p>>>> </samp><kbd>data = {'status': 'Test update from Python 3'}</kbd>
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<samp class=p>>>> </samp><kbd>h.add_credentials('diveintomark', '<var>MY_SECRET_PASSWORD</var>')</kbd>
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<samp class=p>>>> </samp><kbd>resp, content = h.request('http://twitter.com/statuses/update.xml', 'POST', urlencode(data))</kbd>
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<samp class=p>>>> </samp><kbd>resp.status</kbd>
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<samp>200</samp>
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<samp class=p>>>> </samp><kbd>from xml.etree import ElementTree as etree</kbd>
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@@ -608,9 +608,9 @@ reply: 'HTTP/1.1 301 Moved Permanently'</samp>
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<pre class=screen>
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# continued from the previous example
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<samp class=p>>>> </samp><kbd>tree.findtext("id")</kbd>
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<samp class=p>>>> </samp><kbd>tree.findtext('id')</kbd>
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<samp>'1973974228'</samp>
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<samp class=p>>>> </samp><kbd>resp, delete_content = h.request("http://twitter.com/statuses/destroy/{0}.xml".format(tree.findtext("id")), "DELETE")</kbd>
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<samp class=p>>>> </samp><kbd>resp, delete_content = h.request('http://twitter.com/statuses/destroy/{0}.xml'.format(tree.findtext('id')), 'DELETE')</kbd>
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<samp class=p>>>> </samp><kbd>resp.status</kbd>
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<samp>200</samp></pre>
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@@ -627,6 +627,7 @@ reply: 'HTTP/1.1 301 Moved Permanently'</samp>
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<li><a href=http://code.google.com/p/doctype/wiki/ArticleHttpCaching>How to control caching with <abbr>HTTP</abbr> headers</a> on Google Doctype
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</ul>
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<p class=v><a rel=prev class=todo><span>☜</span></a> <a rel=next class=todo><span>☞</span></a>
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<p class=c>© 2001–9 <a href=about.html>Mark Pilgrim</a>
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<script src=j/jquery.js></script>
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<script src=j/dip3.js></script>
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