This blog post explained a feature that was reverted before the release of
Symfony 4.2. That's why the original blog post content has been removed. You can
keep using the following Request methods to work with request formats and
MIME types: getMimeType(), getFormat(), getRequestFormat(),
getContentType() and getAcceptableContentTypes().
New in Symfony 4.2 Acceptable Request Formats
        
            October 26, 2018
        
        •
        
            Published by
                            
                    
 Javier Eguiluz
                
            
                            Javier Eguiluz
                    
    
                Published in
                                    #Living on the edge
                            
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Which would be the equivalent for '/' ???
Formats are defined in one internationnaly norm ?
Since the code is :
There's no format for /.
You can maybe trye to add your own like :
'' => array('/*'),
Thanks for the feedbacks. This has been reverted in https://github.com/symfony/symfony/pull/29047