Day 19 - Th, Mar 28th, 2013¶
Schedule:
- Discussion of HTTP
- Ask homework-related questions & clarifications.
- Work on questions from Day 18 - Tu, Mar 26th, 2013 and today.
- Minute cards.
More about HTTP¶
Read this document and connect it to what I show you in class today & your ‘GET’ work. Ask questions!
Topics I’ll try to cover today:
- connecting to port 80 of ‘lyorn.idyll.org’ and ‘www.google.com’
- structure of HTTP requests and responses
- “metadata” other than received and submitted content
- URLs at google.com
Using JSON-RPC in anger¶
Take a look in the ‘twitter/’ subdirectory of
https://github.com/ctb/cse491-webz
These scripts turn an address INTO a geolocation (latitude & longitude) using the Google Maps API, and turn a geolocation back into an address (using the Twitter geolocation API, from v1 of the API).
NOTE You’ll need to use ‘python2.6’ instead of ‘python’ or ‘python2.7’. Sorry!
Your mission –
Hook the scripts or code up so that you can take an address and see what happens when you geolocate it via Google Maps and decode it via Twitter.
Look through the latest Twitter API (v1.1) and work on gaining authenticated access to the API for your own Twitter account. Note, excessive googling for answers may be needed!
Bonus: sign up for a Twitter account if you don’t have one ;).
Templating with Jinja2¶
As you have probably already seen, there’s lots of repetition in your various HTML files. This will get worse and worse as you add stylesheets, JavaScript, etc. Plus, you run the very real risk of lots of duplicate code, some of which will be right and some of which will be wrong.
The correct solution for this is templating. We’ll be using jinja2 templating, which is similar in concept to many other templating systems.
The basic idea is that you have a template “source file” that you then “render”, providing variables to fill in for whatever needs to be customized for that page.
Trying it out¶
Grab the latest:
https://github.com/ctb/cse491-webz
Enable your virtualenv:
source env491/bin/activate.csh
And install jinja2:
pip install jinja2
Now, go into cse491-webz/jinja2/, and try running:
python render.py test.html
and
python render.py test2.html
and
python render.py test3.html
Look at the files in ‘templates/’. What’s going on here?
Minute Cards¶
In the last 5 minutes of class, please fill out this minute card survey.