The HTTP protocol specifies that the path is handled transparently by those who handle URLs, except for the servers which de-reference them. The path is passed by the client to the server with any request, but is not otherwise understood by the client.

The host details are not passed on to the client when the URL is an http URL which refers to the server in question. In this case the string sent starts with the slash which follows the host details. However, when an http server is being used as a gateway (or "proxy") then the entire URI, whether HTTP or some other scheme, is passed on the HTTP command line.The search part, if present, is sent as part of the HTTP command, and may in this respect be treated as part of the path.No fragmentid part of a WWW URI (the hash sign and following) is sent with the request. Spaces and control characters in URLs must be escaped for transmission in HTTP, as must other disallowed characters.