The easiest way to set up Last-Modified in Flask

Sample code that returns json with flask --uokada's diary

I opened it for a while from the above entry, but I found an easy way when I looked at Stack Overflow, so I will introduce it. http - RFC 1123 Date Representation in Python? - Stack Overflow

from wsgiref.handlers import format_date_time

This format_date_time function is the point. If you pass a time stamp to this, it will be formatted and output in RFC1123 format.

The sample code looks like this.

#!/usr/bin/env  python2.7
from flask import Flask, jsonify, after_this_request
from wsgiref.handlers import format_date_time
from datetime import datetime
from time import mktime


app = Flask(__name__)

@app.route('/name/<name>.json')
def hello_world(name):
    greet = "Hello %s from flask!" % name
    result = {
        "Result":{
        "Greeting": greet
        }
    }
    @after_this_request
    def d_header(response):
        """ add header

        Arguments:
        - `response`:
        """
        now = datetime.now()
        stamp = mktime(now.timetuple())
        response.headers['Last-Modified'] = \
            format_date_time(stamp)
        return response
    return jsonify(ResultSet=result)

if __name__ == '__main__':
    app.run(debug=True)

Launch the script and check the headers returned by the application.

% curl -I localhost:5000/name/uokada.json
HTTP/1.0 200 OK
Content-Type: application/json
Content-Length: 91
Last-Modified: Thu, 28 Feb 2013 17:47:20 GMT
Server: Werkzeug/0.8.3 Python/2.7.1
Date: Thu, 28 Feb 2013 17:47:20 GMT

Last-Modified is properly output in RFC 1123 format.

I didn't notice this function at all because it wasn't listed in the Japanese translation. 20.4. wsgiref — WSGI Utility and Reference Implementation — Python 2.7ja1 documentation

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