Python Flask POST 400 Bad Request Error
Solution 1
If you're just navigating to http://10.0.0.119 then you're sending a GET request to def result() which will result in a bad request because there is no data['Temp']
In order to make this work in a browser you will need to send a POST request from the app itself, and then have a way to view it.
Your app could be:
import requests
from random import randint
from flask import Flask, request, render_template
app = Flask(__name__)
def Temp():
return randint(0,20)
@app.route("/", methods=['GET','POST'])
def result():
if request.method == 'POST':
data = request.form.get('data')
Temp = data['Temp']
return render_template('dispaly_data.html', name=Temp)
else:
data = {'Temp': Temp()}
return render_template('post_data.html', data=data)
if __name__ == "__main__":
app.run()
And your form in post_data.html could be something like:
<form action="/" method='post'>
<input type="hidden" name="data" value="{{ data }}"/>
<input type='submit' value='Send Post'>
</form>
Solution 2
You send wrong request. You have to use json=data to send it as JSON
r = requests.post('http://10.0.0.119', json=data)
SalamalCamel
Updated on July 09, 2022Comments
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SalamalCamel almost 2 years
I'm trying to POST data to a website using flask, when I try to return the data I get a 400 Bad Request error.
Here is my python code that sends the POST request:
import requests from random import randint def Temp(): return randint(0,20) data = {'windspeed':WindSpeed(), 'Temp': Temp(), 'WindDir':WindDir()} r = requests.post('http://10.0.0.119', data = data) print (r.text)And this is the server code:
from flask import Flask, request, render_template app = Flask(__name__) @app.route("/", methods=['GET','POST']) def result(): data = request.get_json(force=True) Temp = data['Temp'] return render_template('main.html', name=Temp) if __name__ == "__main__": app.run()This returns a 400 error when run in a a browser, but the client script gets the correct respone:
<!DOCTYPE html> <html> <body> <h1>Temperature</h1> <p>15</p> </body> </html>Where 15 is the data['Temp'] variable.