How to send data via POST or GET in Mod_Python?

Question

With JS, i send a AJAX post request.

 $.ajax(
        {method:"POST",
        url:"https://my/website/send_data.py",
        data:JSON.stringify(data),
        contentType: 'application/json;charset=UTF-8'

On my Apache2 mod_Python server, I wish for my python file to access data. How can i do this?

def index(req):
    # data = ??

PS: here is how to reproduce the problem. Create testjson.html:

<script type="text/javascript">
xhr = new XMLHttpRequest();
xhr.open("POST", "testjson.py");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function(res) { console.log(xhr.responseText); };
xhr.send(JSON.stringify({'foo': '0', 'bar': '1'}));
</script>

and create testjson.py containing:

from mod_python import apache 

def index(req):
    req.content_type = "application/json"
    req.write("hello")
    data = req.read()
    return apache.OK

Create a .htaccess containing:

AddHandler mod_python .py
PythonHandler mod_python.publisher

Here is the result:

testjson.html:10 POST http://localhost/test_py/testjson.py 501 (Not Implemented)

@fedterzi Unless i'm mistaking those posts are related to vanilla Python, not to mod_python frameworks. — Mitchell van Zuylen
– Mitchell van Zuylen, Commented Apr 10, 2017 at 14:46
@fedterzi No, it's not a duplicate, it's specific to mod_python. — Basj
– Basj, Commented Feb 13, 2020 at 13:09
@MitchellvanZuylen How did you solve the problem in the meantime? Thanks in advance! — Basj
– Basj, Commented Feb 13, 2020 at 13:10
Sorry. I stepped away from Apache and mod_python, instead now using django with nginx. — Mitchell van Zuylen
– Mitchell van Zuylen, Commented Feb 14, 2020 at 10:09
But, possibly the same code is usable. Within the index function i set data = req.POST.get('data',False) — Mitchell van Zuylen
– Mitchell van Zuylen, Commented Feb 14, 2020 at 10:10

Basj · Accepted Answer · 2020-02-21 16:08:12Z

As pointed by Grisha (mod_python's author) in a private communication, here is the reason why application/json is not supported and outputs a "HTTP 501 Not implemented" error:

https://github.com/grisha/mod_python/blob/master/lib/python/mod_python/util.py#L284

The solution is either to modify this, or to use a regular application/x-www-form-urlencoded encoding, or to use something else than the mod_python.publisher handler.

Example with mod_python and PythonHandler mod_python.publisher:

<script type="text/javascript">
var data = JSON.stringify([1, 2, 3, '&=test', "jkl", {'foo': 'bar'}]); // the data to send
xhr = new XMLHttpRequest();
xhr.open("POST", "testjson.py");
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function(res) { console.log(xhr.responseText); };
xhr.send('data=' + encodeURIComponent(data));
</script>

Server-side:

import json
from mod_python import apache 

def index(req):
    data = json.loads(req.form['data'])
    x = data[-1]['foo']
    req.write("value: " + x)

Output:

value: bar

Success!

A K · Accepted Answer · 2020-02-19 14:00:04Z

1

From Mod_python docs:

Client data, such as POST requests, can be read by using the request.read() function.

answered Feb 19, 2020 at 14:00

A K

8287 silver badges19 bronze badges

4 Comments

Basj Over a year ago

Thank you for this answer, but this does not work in the case of a application/json request. See the end of the updated question, are you able to reproduce the problem too?

A K Over a year ago

OK. It seems like a configuration problem.

Basj Over a year ago

I tried on another fresh server wtih apache, mod_php, python, etc. and it's the same: HTTP 501 not implemented. When I do a GET it works with HTTP 200. Also OP had the same problem. So at least on 3 machines we were able to reproduce the same error.

A K Over a year ago

I answered in a new answer, as it is something else.

Prakhar Londhe · Accepted Answer · 2020-02-20 09:58:38Z

0

From the Mod Python docs here.

Here you can do, for example to get the data

def index(req):
    data = req.read()

Additional Links : http://vandermerwe.co.nz/?p=9

edited Feb 20, 2020 at 9:58

answered Feb 20, 2020 at 9:46

Prakhar Londhe

1,4711 gold badge13 silver badges27 bronze badges

3 Comments

Basj Over a year ago

Thank you for this answer, but this does not work in the case of a application/json request. See the end of the updated question.

Prakhar Londhe Over a year ago

Maybe take a look at the website, I think the author ran into a similar problem there.

Mitchell van Zuylen Over a year ago

@prakharlondhe Can you link to the location? the website is a little vague.

A K · Accepted Answer · 2020-02-20 15:36:35Z

0

As I said, from the new edition it looks like a configuration problem.

First, try to set PythonPath directive.

Secondly, the PythonHandler should be your file, i.e.:

PythonHandler testjson

answered Feb 20, 2020 at 15:36

A K

8287 silver badges19 bronze badges

2 Comments

Basj Over a year ago

In fact I want to keep PythonHandler mod_python.publisher because this allows example.com/hello.py to be automatically mapped to running hello.py, example.com/login.py to be automatically mapped to running login.py, instead of hardcoding only one PythonHandler and working with only 1 .py file.

A K Over a year ago

Look here: issues.apache.org/jira/browse/MODPYTHON-29, and here: modpython.org/pipermail/mod_python/2007-May/023761.html

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