Flask: Send form POST data to Python script #20
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Since we are using php as a primary means for our web pages, we do not need the full features django offers. We are using python as a programming language to handle the data, and analysis for support vector machine computations (and related, computational intensive tasks). Therefore, we will choose to use Flask as our Python Web Framework. IRC #python (08/20/14 ~ 9:20pm EST):
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b49b1d3: After installing flask, we changed ## index.py
# This file currently tests the basic implementation of the 'Flask',
# web-framework.
#!/usr/bin/python
from flask import Flask
app = Flask(__name__)
@app.route('/tests/python/index.py')
def hello_world():
return 'Hello World!'
if __name__ == '__main__':
app.run()Now, when we start we notice within the browser:
Meanwhile, terminal outputs the following shortly after the browser attempts access: All other pages renders a 404 error within the browser:
and, within the terminal: |
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We will now try to fetch POST data from |
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Now, we start the flask Then, we visit the
which redirects us to the following page upon submission:
The terminal page dedicated to So, manually type
The terminal page dedicated to |
jeff1evesque
changed the title
jeff1evesque
changed the title
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We need to implement an interface that will allow the communication between our webserver (apache2), and our python script, The first step is to download Next, we define a .wsgi file: with the following content: ## flask_form.wsgi
# This file will import the main 'flask' application object, and
# execute it within the WSGI Apache module.
import sys
from flask_form import app as applicationNote: WSGI (Web Server Gateway Interface) is an interface between web servers and web apps for python. Mod_wsgi is an Apache HTTP server mod that enables Apache to serve Flask applications. Then, we find the vhosts: so, that we can adjust the vhost configurations for Apache2: by adding the following to the top of the file: # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
WSGIDaemonProcess yourapplication user=nobody group=www-data threads=5
WSGIScriptAlias /machine-learning/tests/python/ /var/www/html/machine-learning/tests/python/flask_form.wsgi
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...Note: We used the suggested Note: In the above case, we have a single vhost, specifically After making the above configurations, we are still receiving the 404 error within terminal, as well as the same Not Found message within the browser window. When we change IRC #httpd (08/23/14 ~ 1:30pm EST):
IRC #python (08/23/14 ~ 11:30am EST):
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We removed all errors in Now, the following errors are apparent in The repeating error: indicates
Note: the last line of error can be eliminated by removing what we had earlier added to # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
WSGIDaemonProcess yourapplication user=nobody group=www-data threads=5
WSGIScriptAlias /machine-learning/tests/python/ /var/www/html/machine-learning/tests/python/flask_form.wsgi
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...At Apache2 reboot, we receive the following error messages: |
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We changed our earlier VirtualHost: to the following: # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
DocumentRoot /var/www/html/machine-learning/
WSGIDaemonProcess flask_form user=www-data group=www-data threads=5
WSGIScriptAlias /machine-learning/tests/python/ /var/www/html/machine-learn$
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...Now, we run and, visit
which produces the following message within the terminal console running We notice |
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ace23b9: we allow flask to write its errors in Now, restart apache2: Then, start Access the page in the browser:
The terminal console running And, |
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We've switched our environment from a temporary working environment, to a dual boot into Ubuntu Server 14.04. Upon Next, we start and, notice
Next, we revisit |
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640a4e3: We've updated Then, we check
Next, we revisit |
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We make sure to install We check Again, we restart Then, we check
Next, we revisit |
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We use with the following: # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
DocumentRoot /var/www/html/machine-learning/
WSGIDaemonProcess flask_form user=www-data group=www-data threads=5
WSGIScriptAlias /machine-learning/tests/python/ /var/www/html/machine-learn$
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...ac1c7f2: We add
We check Then, proceed opening
Next, we revisit However, our definitions in ...
else:
return redirect(url_for('/machine-learning/tests/python/form.html'))
...should redirect all requests that are not POST to |
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9a9c212: we add conditional statements based on the HTTP method, and redirect to the |
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Now, we visit the
which redirects us to the following page upon submission:
The terminal page dedicated to and, no new log error messages have been added. Then, we visit
We notice the following messages in terminal: However, we find no new error log messages in |
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6507968: We properly implement
Note: Earlier we copied an incomplete copy of the VirtualHost into # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
DocumentRoot /var/www/html/machine-learning/
WSGIDaemonProcess flask_form user=www-data group=www-data threads=5
WSGIScriptAlias /machine-learning/tests/python/ /var/www/html/machine-learn$
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...We remedy our typo / mistake by copying the following, instead: # VirtualHost used for Python Flask (edited by JL)
<VirtualHost *>
ServerName localhost
WSGIDaemonProcess flask_form user=www-data group=www-data threads=5
WSGIScriptAlias / /var/www/html/machine-learning/tests/python/flask_form.wsgi
<Directory /var/www/html/machine-learning/tests/python/>
WSGIProcessGroup flask_form
WSGIApplicationGroup %{GLOBAL}
Order deny,allow
Allow from all
</Directory>
</VirtualHost>
...We are still supplied with the same NotFound browser message, and the terminal console running |
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We will simply have the the form POST data be sent to another php script. This php script will delegate, or pass relevant parameters to python (i.e. |
#20: Temporarily Explore Python Flask
We will research which python web framework to implement for receiving POST data from an HTML5
<form>element, which we hope to send to a python script.The text was updated successfully, but these errors were encountered: