mirror of https://github.com/mitsuhiko/flask.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.6 KiB
50 lines
1.6 KiB
.. _server: |
|
|
|
Development Server |
|
================== |
|
|
|
.. currentmodule:: flask |
|
|
|
Starting with Flask 1.0 there are multiple built-in ways to run a |
|
development server. The best one is the :command:`flask` command line utility |
|
but you can also continue using the :meth:`Flask.run` method. |
|
|
|
Command Line |
|
------------ |
|
|
|
The :command:`flask` command line script (:ref:`cli`) is strongly recommended for |
|
development because it provides a superior reload experience due to how it |
|
loads the application. The basic usage is like this:: |
|
|
|
$ flask -a my_application --debug run |
|
|
|
This will enable the debugger, the reloader and then start the server on |
|
*http://localhost:5000/*. |
|
|
|
The individual features of the server can be controlled by passing more |
|
arguments to the ``run`` option. For instance the reloader can be |
|
disabled:: |
|
|
|
$ flask -a my_application --debug run --no-reload |
|
|
|
In Code |
|
------- |
|
|
|
The alternative way to start the application is through the |
|
:meth:`Flask.run` method. This will immediately launch a local server |
|
exactly the same way the :command:`flask` script does. |
|
|
|
Example:: |
|
|
|
if __name__ == '__main__': |
|
app.run() |
|
|
|
This works well for the common case but it does not work well for |
|
development which is why from Flask 1.0 onwards the :command:`flask` method is |
|
recommended. The reason for this is that due to how the reload mechanism |
|
works there are some bizarre side-effects (like executing certain code |
|
twice, sometimes crashing without message or dying when a syntax or |
|
import error happens). |
|
|
|
It is however still a perfectly valid method for invoking a non automatic |
|
reloading application.
|
|
|