Unexplainable Flask 404 errors

Question

I have a website that uses Flask. It used to work well, but since recently, every request returns a 404, and it seems it can't find the right endpoints. However:

• Locally, the site still works, only on my VPS it shows this strange behaviour.
• url_for works and app.view_functions contains all the routes as well.
• And yet, I keep getting 404s on the VPS, even for / and anything under /static/.

Here's part of the code, it's a bit much to show all of it and it's not all relevant:

#snip  from flask import Flask, render_template, abort, request, redirect, url_for, session from flask.ext.babelex import Babel from flask.ext import babelex  #snip  app = Flask(__name__) app.secret_key = #snip  #snip  #just one of the routes @app.route('/') def about():     return render_template('about.html')  #snip  @app.errorhandler(404) def page_not_found(e):     #snip     return render_template('404.html'), 404  #snip  if __name__ == '__main__':     app.run(debug=True) else:     app.config.update(         SERVER_NAME='snip.snip.com:80',         APPLICATION_ROOT='/',     ) 

Answer 1

I had the same issue. I had it because I changed the parameters SERVER_NAMEof the config to a name which is not the name of the server.

You can solve this bug by removing SERVER_NAME from the config if you have it.

Answer 2

I know this is old, but I just ran into this same problem. Yours could be any number of issues but mine was that I had commented out the from app import views line in my __init__.py file. It gave me the same symptom: every endpoint that required @app.route and a view was responding with 404's. Static routes (.js and .css) were fine (that was my clue).