Flask request.args vs request.form
My understanding is that request.args in Flask contains the URL encoded parameters from a GET request while request.form contains POST data. What I'm having a hard time grasping is why when sending a POST request, trying to access the data with request.form returns a 400 error but when I try to access it with request.args it seems to work fine.
I have tried sending the request with both Postman and curl and the results are identical.
curl -X POST -d {"name":"Joe"} http://127.0.0.1:8080/testpoint --header "Content-Type:application/json"
Code:
@app.route('/testpoint', methods = ['POST'])
def testpoint():
name = request.args.get('name', '')
return jsonify(name = name)
You are POST-ing JSON, neither request.args nor request.form will work.
request.form works only if you POST data with the right content types; form data is either POSTed with the application/x-www-form-urlencoded or multipart/form-data encodings.
When you use application/json , you are no longer POSTing form data. Use request.get_json() to access JSON POST data instead:
@app.route('/testpoint', methods = ['POST'])
def testpoint():
name = request.get_json().get('name', '')
return jsonify(name = name)
Your json data in curl is wrong, so Flask does not parse data to form.
Send data like this: '{"name":"Joe"}'
curl -X POST -d '{"name":"Joe"}' http://example.com:8080/testpoint --header "Content-Type:application/json"