It's basically just an alias for params.

Lines 426 to 444 in e2793b2

    
           # shortcut for <tt>request.params[key]</tt> 
        
           def [](key) 
        
             if $VERBOSE 
        
               warn("Request#[] is deprecated and will be removed in a future version of Rack. Please use request.params[] instead") 
        
             end 
        
             params[key.to_s] 
        
           end 
        
           # shortcut for <tt>request.params[key] = value</tt> 
        
           # 
        
           # Note that modifications will not be persisted in the env. Use update_param or delete_param if you want to destructively modify params. 
        
           def []=(key, value) 
        
             if $VERBOSE 
        
               warn("Request#[]= is deprecated and will be removed in a future version of Rack. Please use request.params[]= instead") 
        
             end 
        
             params[key.to_s] = value 
        
           end

I really like it as it makes code short and concise.

	# shortcut for <tt>request.params[key]</tt>
	def [](key)
	if $VERBOSE
	warn("Request#[] is deprecated and will be removed in a future version of Rack. Please use request.params[] instead")
	end

	params[key.to_s]
	end

	# shortcut for <tt>request.params[key] = value</tt>
	#
	# Note that modifications will not be persisted in the env. Use update_param or delete_param if you want to destructively modify params.
	def []=(key, value)
	if $VERBOSE
	warn("Request#[]= is deprecated and will be removed in a future version of Rack. Please use request.params[]= instead")
	end

	params[key.to_s] = value
	end

Clarification regarding Rack::Request#[] #1277

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Clarification regarding `Rack::Request#[]` #1277