About
The HTTP GET method is the default request retrieval action of the HTTP protocol. For example, the same than RETR in FTP.
GET is the primary mechanism of information retrieval.
Message structure
A payload within a GET request message has no defined semantics; sending a payload body on a GET request might cause some existing implementations to reject the request.
Management
Cache
The response to a GET request is cacheable; a cache MAY use it to satisfy subsequent GET and HEAD requests unless otherwise indicated by the Cache-Control header field (Section 5.2 of RFC7234) See HTTP - Cache (Cache-Control Header, Bursting, )
Conditional
A get can be conditional if the response was cached.