[Python] render_template does nothing after receiving ajax content (flask, Python, JavaScript)

I am passing data with ajax to my python function when a condition is met:

if (lesson.length === 0) {
$.ajax(
{
type:'POST',
contentType:'application/json',
dataType:'json',
url:'http://127.0.0.1:5000/result?value=' + errors ,
success:function(response){ document.write(response); }
}
);
}


I know that the information is correctly received, since I can see it in the terminal through print:

127.0.0.1 - - [19/Aug/2020 11:59:46] "GET /static/flexjava.js HTTP/1.1" 200 -
0
127.0.0.1 - - [19/Aug/2020 11:59:48] "POST /result?value=0 HTTP/1.1" 200 -


But Python does nothing after the print() function. Render or redirect both don't work, the browser stays just as it is even though the information was passed:

@app.route("/result", methods=["GET", "POST"])
def result():
content = request.args.get('value')
if "username" not in session or session["username"] == "guest":
return redirect("/login")
if request.method == "GET":
return redirect("/")
else:
print(content)
return render_template("finished.html")

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