What is content negotiation in REST, and how does it work?

• Content negotiation allows clients to specify desired response format.
• Uses HTTP headers:
• Accept: application/json → Request JSON.
• Accept: application/xml → Request XML.
• The server returns response in requested format (if supported).

👉 Example in ASP.NET Core: Add XML formatter with

services.AddControllers()

.AddXmlSerializerFormatters();