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To do this, throw a special type of exception:. Otherwise, the response will have a HTTP status code:. In every case, an error page is shown to the end user and a full debug error page is shown to the developer i. To customize the error page that's shown to the user, see the How to Customize Error Pages article.
What if you need to read query parameters, grab a request header or get access to an uploaded file? That information is stored in Symfony's Request object. To access it in your controller, add it as an argument and type-hint it with the Request class :. Keep reading for more information about using the Request object. Symfony provides a session object that you can use to store information about the user between requests. Session is enabled by default, but will only be started if you read or write from it.
Session storage and other configuration can be controlled under the framework. To get the session, add an argument and type-hint it with SessionInterface :. You can also store special messages, called "flash" messages, on the user's session. By design, flash messages are meant to be used exactly once: they vanish from the session automatically as soon as you retrieve them. This feature makes "flash" messages particularly great for storing user notifications.
For example, imagine you're processing a form submission:. After processing the request, the controller sets a flash message in the session and then redirects. In order to help writing more advanced response processors, the component provides an AsyncDecoratorTrait. This trait allows processing the stream of chunks as they come back from the network:. Because the trait already implements a constructor and the stream method, you don't need to add them.
The request method should still be defined; it shall return an AsyncResponse. It will be called for each chunk yielded by the underlying client.
You could also yield a modified chunk, split the chunk into many ones by yielding several times, or even skip a chunk altogether by issuing a return; instead of yielding.
In order to control the stream, the chunk passthru receives an AsyncContext as second argument. This context object has methods to read the current state of the response. It also allows altering the response stream with methods to create new chunks of content, pause the stream, cancel the stream, change the info of the response, replace the current request by another one or change the chunk passthru itself.
Checking the test cases implemented in AsyncDecoratorTraitTest might be a good start to get various working examples for a better understanding. Here are the use cases that it simulates:. The logic in AsyncResponse has many safety checks that will throw a LogicException if the chunk passthru doesn't behave correctly; e.
Such tests can be useful, as they will run faster and produce consistent results, since they're not dependent on an external service. By not making actual HTTP requests there is no need to worry about the service being online or the request changing state, for example deleting a resource. When you type-hint with HttpClientInterface your code will accept the real client outside tests, while replacing it with MockHttpClient in the test.
There are a few ways to use it, as described below. The first way of using MockHttpClient is to pass a list of responses to its constructor. These will be yielded in order when requests are made:. Another way of using MockHttpClient is to pass a callback that generates the responses dynamically when it's called:. The responses provided to the mock client don't have to be instances of MockResponse.
Any class implementing ResponseInterface will work e. However, using MockResponse allows simulating chunked responses and timeouts:.
Finally, you can also create an invokable or iterable class that generates the responses and use it as a callback in functional tests:. The MockResponse class comes with some helper methods to test the request:. The following standalone example demonstrates a way to use the HTTP client and test it in a real application:. Basic Usage Use the HttpClient class to make requests. Note HTTP compression and chunked transfer encoding are automatically enabled when both your PHP runtime and the remote server support them.
Uploading Data This component provides several methods for uploading data using the body option. Cookies The HTTP client provided by this component is stateless but handling cookies requires a stateful storage because responses can update cookies and they must be used for subsequent requests. Redirects By default, the HTTP client follows redirects, up to a maximum of 20, when making a request.
Retry Failed Requests 5. Configuring CurlHttpClient Options 5. Viewed 24k times. Jan Schultke 5, 1 1 gold badge 20 20 silver badges 50 50 bronze badges.
Lucas Campos Lucas Campos 2 2 gold badges 9 9 silver badges 22 22 bronze badges. Add a comment. Active Oldest Votes. The code would be something like: Session::flash 'download. Community Bot 1 1 1 silver badge.
I'm getting stucked in a loop where always my layouts redirects to the download file. I can not unset or dont know how the download url — Julian Mendez.
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