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I am trying to send a python dictionary created from client.py to my webservice, have the webservice do something to the data, and return a boolean to client.py. This is the code I have so far for the server and client:
Server side (inside webservice.py):
from flask import Flask
from flask import request
import json
app = Flask(__name__)
@app.route('/determine_escalation',methods = ['POST'])
def determine_escalation():
jsondata = request.form['jsondata']
data = json.loads(jsondata)
#stuff happens here that involves data to obtain a result
result = {'escalate':'True'}
return json.dumps(result)
if __name__ == '__main__':
app.run(debug=True)
Client side (inside client.py):
import sys
import json
import requests
conv = [{'input': 'hi', 'topic': 'Greeting'}]
s = json.dumps(conv)
res = requests.post("http://127.0.0.1:5000/determine_escalation",data=s)
print res.text
But when I print out res.text, I get this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>400 Bad Request</title>
<h1>Bad Request</h1>
<p>The browser (or proxy) sent a request that this server could not understand.</p>
What am I doing wrong, and how can I fix this? New to Flask and JSON stuff so any help is appreciated.
293
Solution. The request module allows you to access the data passed into your Flask application through an HTTP request. The data within a request can be accessed through the request module's properties.
GET and POST requestsEnter the following script in the Python shell. Once the development server is up and running, open login. html in the browser, enter the name in the text field, and then click Submit. The form data will POST to the URL in the action clause of the form label.
OK - a few issues here:
First, you can use requests.get_json() to retrieve your JSON data at the server end:
from flask import Flask
from flask import request
import json
app = Flask(__name__)
@app.route('/determine_escalation/', methods = ['POST'])
def determine_escalation():
jsondata = request.get_json()
data = json.loads(jsondata)
#stuff happens here that involves data to obtain a result
result = {'escalate': True}
return json.dumps(result)
if __name__ == '__main__':
app.run(debug=True)
Also, when you are putting your data together, rather than using "data=s" to send the request, use "json=s":
import sys
import json
import requests
conv = [{'input': 'hi', 'topic': 'Greeting'}]
s = json.dumps(conv)
res = requests.post("http://127.0.0.1:5000/determine_escalation/", json=s).json()
print(res['escalate'])
Please note that I have added trailing slashes at the end of the URL - this is just good practice :-)
I've also incorporated MarcelK's suggested changes - removing the quotes from the boolean 'True' (server side) and using .json() to parse the response on the client side - both of these are great suggestions.
I've tested this revised version (and re-revised version) and it works fine.
106
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