nginx + uwsgi + flask - disabling custom error pages

Question

Is it possible to disable nginx\'s custom error pages - if I may call them that - to display my framework\'s exception pages?

I can\'t really see my werkzeug debugge

Answer 1

Simon Sapin has really given you the correct answer. You need to enable debug in Flask. Nginx does not return any custom error pages unless you explictly configure it to do so.

If you use the following code you will see your debug messages from flask, proxied via Nginx.

from flask import Flask

app = Flask(__name__)
app.debug = True

@app.route('/')
def index():
    raise Exception()

As per your update 2. You are seeing a 502 (bad gateway) because Flask is simply not returning any response at all, or a response that Nginx does not understand. A 502 is not a problem with Nginx. It means that whatever Nginx is trying to talk (your flask app in this case) is not working properly at all.

However, in many ways you shouldn't be doing this. Debugging mode should only be enabled when you are running flask on your local dev machine. Which is the whole point of the if __name__ == "__main__": line anyway.