Flask: how to return different content to each user that might visit at the same time

import io
from flask import make_response
...
@app.route("/my_plot.png")
def my_plot():
     ....
     coin_plot = sns.catplot(x='24hours', y='coin name', data=plot_df, kind='bar')
     plt.title('Coins and 24 hours market change')
     buffer = io.StringIO()
     coin_plot.savefig(buffer, format="png")   
     buffer.seek(0)
     response = make_response(buffer.read())
     response.headers.set('Content-Type', 'image/png')
     response.headers.set('Content-Disposition', 'attachment', filename='image.png')
     return response