Why is it not assumed to send a message body in HTTP GET requests?

The GET method in HTTP is intended for requesting a resource without changing the server's state. Sending a message body in GET requests is not recommended for several reasons:

• HTTP Standards: The HTTP/1.1 specification does not prohibit a body in GET, but it does not define its semantics, so servers and proxies may ignore or mishandle the body.
• Idempotency and Caching: GET requests should be idempotent and cacheable, and a body can violate these properties.
• Practice and Compatibility: Most clients and servers do not support a body in GET, which can lead to errors.

Therefore, data is usually transmitted via URL parameters (query string) or other methods, such as POST.