Q:

About http request and request

I'm trying to understanding HTTP request and requset concepts.
What does mean "HTTP request"? My undesrtanding is following:
I think that "HTTP request" is just char sequence which is serialized to ASCII byte stream and transfering via network. From the standardized of ASCII implies that on server-side this ASCII byte sequences will be deserialized in a correct char sequnces and independent from what means are implemented client and server sides. 
But what about request? 
I think that request is no more than abstraction by means of which client and server are communicated in a client-server model. This abstraction satisfies that request can be sended to server and server can be get a request.

A:

What does mean "HTTP request"?

HTTP is a protocol. An HTTP request is defined by the protocol, specifically in RFC 2616 §5. It is not "just" a char sequence. It is a sequence of characters sent from a computer (which is, by definition, the client) to another (which is, by definition, the server), and this sequence must conform to the spec.

But what about request?

In what context are you using "request" for anything other than a shorthand for "HTTP request?"

