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javapythonjsonpostrestlet

JSON in a POST request is unsupported for Restlet

We're creating small project in which we have flask as a FrontEnd and restlet based WebService.

We try to send login data as a JSON from flask to restlet:

def login():
    error = None
    if request.method == 'POST':
        payload = {'username' : request.form['username'], 'password' : request.form['password']}
        headers = {'Content-Type': 'application/json'}
        req = requests.post(WEBSERVICE_IP + '/login', data=json.dumps(payload), headers=headers)
        (...)

Flask based website is shouting about:

ValueError: No JSON object could be decoded

We have no idea how to reconcile communication between flask and restlet.

Edit (22-04 10:08pm GMT): I found out that responce was:

<html>
(...)
Unsupported Media Type
The server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method
(...)
</html>

Edit (22-04 11:26pm GMT): I'm still not sure why, but I supposed that it may be something with JSON format. After correcting my code so it will send correct JSON (said JSONLint), I still get the same messages. Anyone know how to create JSONObject in Python? WebService have method:

@Post("json")
public JSONObject verifyAccount(JSONObject dane){

Edit (23-04 7:26pm GMT): Ok. So we're almost sure that it's problem with invisible header. Can anyone confirm that header creation in python code here is correct?

Edit (24-04 5:40pm GMT): Problem is still actual. As some other suggested, I changed requests back to the urllib2. This helped with the first thing - "Value problem". Now browser is having

urllib2.HTTPError
HTTPError: HTTP Error 415: Unsupported Media Type

POST Request now:

@app.route('/login', methods=['GET', 'POST'])
def login():
    error = None
    if request.method == 'POST':
        payload = {"Login": request.form['username'],
            "Haslo": request.form['haslo']}
        data = json.dumps(payload)
        clen = len(data)
        req = urllib2.Request(WEBSERVICE_IP + '/login', data,
            {'Content-Type': 'application/json', 'Content-Length': clen})
        f = urllib2.urlopen(req)
        response = f.read()
        f.close()

Edit (24-04 6:20pm GMT):

Wireshark captured POST request and it looks ok.

Wireshark captured POST request and it looks ok.

Solution

  • Ok. Solution was easier than I would think.

    Problem was on the WebService side. It was resolved by changing JSONObject to JsonRepresentation:

    @Post("json")
public JSONObject verifyAccount(JsonRepresentation data){