If you want to get hold of the resulting response object inside the view Valid WSGI application and convert that into a response object. If none of that works, Flask will assume the return value is a
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The status code and headers can be a list or dictionary of (response, status), (response, headers), or If a tuple is returned the items in the tuple can provide extra If it’s a dict or list, a response object is created using
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If it’s an iterator or generator returning strings or bytes, it is If it’s a string, a response object is created with that data and If a response object of the correct type is returned it’s directly The logic that Flask applies to converting return values into Return value is a dict or list, jsonify() is called to produce a If the return value is a string it’sĬonverted into a response object with the string as response body, aĢ00 OK status code and a text/html mimetype. The return value from a view function is automatically converted intoĪ response object for you. See Handling Application Errors for more details. By default 200 is assumed which translates to: all went well. Tells Flask that the status code of that page should be 404 which means Note the 404 after the render_template() call. errorhandler ( 404 ) def page_not_found ( error ): return render_template ( 'page_not_found.html' ), 404 Here is an example:įrom flask import render_template. Test request so that you can interact with it. In combination with the with statement it will bind a Unit testing is to use the test_request_context()Ĭontext manager. Object yourself and binding it to the context. Will notice that code which depends on a request object will suddenly breakīecause there is no request object. This is the case unless you are doing something like unit testing.
So what does this mean to you? Basically you can completely ignore that It does that in an intelligent way so that one application can invoke another When Flask starts its internal request handling itįigures out that the current thread is the active context and binds theĬurrent application and the WSGI environments to that context (thread). Underlying object is capable of dealing with concurrency systems other Web server decides to spawn a new thread (or something else, the Imagine the context being the handling thread. But that is actually quite easy to understand. These objects are actually proxies to objects that are local to a specificĬontext.
Tests with context locals, read this section, otherwise just skip it.Ĭertain objects in Flask are global objects, but not of the usual kind. If you want to understand how that works and how you can implement Tells Flask to behave as though it’s handling a request even while we use a myapplication instead of /, url_for() properlyįor example, here we use the test_request_context() method If your application is placed outside the URL root, for example, in The generated paths are always absolute, avoiding unexpected behavior URL building handles escaping of special characters transparently. You can change your URLs in one go instead of needing to remember to Reversing is often more descriptive than hard-coding the URLs. Url_for() instead of hard-coding them into your templates? Why would you want to build URLs using the URL reversing function Unknown variable parts are appended to the URL as query parameters. Keyword arguments, each corresponding to a variable part of the URL rule. It accepts the name of the function as its first argument and any number of To build a URL to a specific function, use the url_for() function.
Keep URLs unique for these resources, which helps search engines avoid Trailing slash ( /about/) produces a 404 “Not Found” error. The canonical URL for the about endpoint does not have a trailing If you access the URL withoutĪ trailing slash ( /projects), Flask redirects you to the canonical URL It’s similar to a folder in a file system. The canonical URL for the projects endpoint has a trailing slash. route ( '/about' ) def about (): return 'The about page' route ( '/projects/' ) def projects (): return 'The project page'. You need to tell the Flask where your application To run the application, use the flask command or Your application flask.py because this would conflict with Flask Save it as hello.py or something similar. The default content type is HTML, so HTML in the string The function returns the message we want to display in the user’sīrowser. We then use the route() decorator to tell Flask This is needed so that Flask knows where to look for resources such _name_ is aĬonvenient shortcut for this that is appropriate for most cases. Name of the application’s module or package. Next we create an instance of this class. route ( "/" ) def hello_world (): return "Hello, World!"įirst we imported the Flask class. From flask import Flask app = Flask ( _name_ ).
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