What is content negotiation in Spring MVC?

Working out which data format to return as a response is called Content Negotiation.

Spring supports a couple of conventions for selecting the content type format required. By default they are checked in this order:

• Add a path extension (suffix) in the URL. For example, http://myserver/myapp/accounts/list.json suggests that the return format is json.
• Add URL parameter. For example, the url,http://myserver/myapp/accounts/list?format=xls, here the parameter name is format and it suggest return format as xls.
• Accept HTTP header property.

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