Laravel How to implement the file download function?

There is such a workaround on the development documentation.

The principle is to generate a download response that is automatically downloaded when the route is accessed, but the route is fixed. And the files are fixed. Now you want to implement this feature. In a controller, write the file into the demo.txt under public. Then download Demo.txt to Local.

Found that this can only be obtained in response. However, it cannot be downloaded.
。 How to implement the download function? Because the downloaded files are generated on the fly, the development documentation above says that download generates a fixed route response to download events is inappropriate.

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There is such a workaround on the development documentation.

The principle is to generate a download response that is automatically downloaded when the route is accessed, but the route is fixed. And the files are fixed. Now you want to implement this feature. In a controller, write the file into the demo.txt under public. Then download Demo.txt to Local.

Found that this can only be obtained in response. However, it cannot be downloaded.
。 How to implement the download function? Because the downloaded files are generated on the fly, the development documentation above says that download generates a fixed route response to download events is inappropriate.

Direct output binary stream.

To output the response header

header('Content-Type: plain/text')

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