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Mark Pilgrim
2009-06-02 19:20:06 -07:00
parent 58f6340b28
commit 7fad5e60d2
3 changed files with 26 additions and 1 deletions
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http-web-services.html
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@@ -23,7 +23,7 @@ mark{display:inline}
<h2 id=divingin>Diving In</h2>
<p class=f>HTTP web services are programmatic ways of sending and receiving data from remote servers using nothing but the operations of <abbr>HTTP</abbr>. If you want to get data from the server, use <abbr>HTTP</abbr> <code>GET</code>; if you want to send new data to the server, use <abbr>HTTP</abbr> <code>POST</code>. Some more advanced <abbr>HTTP</abbr> web service <abbr>API</abbr>s also define ways of modifying existing data and deleting data, using <abbr>HTTP</abbr> <code>PUT</code> and <abbr>HTTP</abbr> <code>DELETE</code>. In other words, the &#8220;verbs&#8221; built into the <abbr>HTTP</abbr> protocol (<code>GET</code>, <code>POST</code>, <code>PUT</code>, and <code>DELETE</code>) map directly to application-level operations for retrieving, creating, modifying, and deleting data.
<p>The main advantage of this approach is simplicity, and its simplicity has proven popular with a lot of different sites. Data &mdash; usually <abbr>XML</abbr> data &mdash; can be built and stored statically, or generated dynamically by a server-side script, and all major programming languages (including Python, of course!) include an <abbr>HTTP</abbr> library for downloading it. Debugging is also easier; because each &#8220;call&#8221; to the web service had a unique <abbr>URL</abbr>, you can load it in your web browser and immediately see the raw data.
<p>The main advantage of this approach is simplicity, and its simplicity has proven popular. Data &mdash; usually <abbr>XML</abbr> data &mdash; can be built and stored statically, or generated dynamically by a server-side script, and all major programming languages (including Python, of course!) include an <abbr>HTTP</abbr> library for downloading it. Debugging is also easier; because each &#8220;call&#8221; to the web service had a unique <abbr>URL</abbr>, you can load it in your web browser and immediately see the raw data.
<p>Examples of <abbr>HTTP</abbr> web services:
<ul>
@@ -446,6 +446,28 @@ reply: 'HTTP/1.1 304 Not Modified'</samp>
<p>FIXME
<pre class=screen>
<samp class=p>>>> </samp><kbd>response, content = h.request('http://diveintopython3.org/')</kbd>
<samp>connect: (diveintopython3.org, 80)
send: b'GET / HTTP/1.1
Host: diveintopython3.org
<mark>accept-encoding: deflate, gzip</mark>
user-agent: Python-httplib2/$Rev: 259 $'
reply: 'HTTP/1.1 200 OK'</samp>
<samp class=p>>>> </samp><kbd>print(dict(response.items()))</kbd>
<samp>{<mark>'-content-encoding': 'gzip',</mark>
'accept-ranges': 'bytes',
'connection': 'close',
'content-length': '6657',
'content-location': 'http://diveintopython3.org/',
'content-type': 'text/html',
'date': 'Tue, 02 Jun 2009 03:26:54 GMT',
'etag': '"7f806d-1a01-9fb97900"',
'last-modified': 'Tue, 02 Jun 2009 02:51:48 GMT',
'server': 'Apache',
'status': '304',
'vary': 'Accept-Encoding,User-Agent'}</samp></pre>
<h3 id=httplib2-redirects>How <code>httplib2</code> Handles redirects</h3>
<p>FIXME