http: more cleanup, documentation fixes

The API is very nearly completely converted.

demo/http_client/http_client.c

@@ -52,7 +52,6 @@ main(int argc, char **argv)
 	nng_http        *conn;
 	nng_url         *url;
 	nng_aio         *aio;
-	nng_http_res    *res;
 	const char      *hdr;
 	int              rv;
 	int              len;
@@ -84,7 +83,6 @@ main(int argc, char **argv)
 
 	// Get the connection, at the 0th output.
 	conn = nng_aio_get_output(aio, 0);
-	res  = nng_http_conn_res(conn);
 
 	// Request is already set up with URL, and for GET via HTTP/1.1.
 	// The Host: header is already set up too.

demo/reqrep/reqrep.c

@@ -103,7 +103,6 @@ client(const char *url)
 	nng_socket sock;
 	nng_dialer dialer;
 	int        rv;
-	size_t     sz;
 	int        sleep = 0;
 
 	if ((rv = nng_init(NULL)) != 0) {

demo/rest/server.c

@@ -165,8 +165,8 @@ rest_job_cb(void *arg)
 		}
 		job->msg = nng_aio_get_msg(aio);
 		// We got a reply, so give it back to the server.
-		rv = nng_http_res_copy_data(nng_http_conn_res(job->conn),
-		    nng_msg_body(job->msg), nng_msg_len(job->msg));
+		rv = nng_http_copy_body(
+		    job->conn, nng_msg_body(job->msg), nng_msg_len(job->msg));
 		if (rv != 0) {
 			rest_http_fatal(job, rv);
 			return;
@@ -189,7 +189,6 @@ void
 rest_handle(nng_http *conn, void *arg, nng_aio *aio)
 {
 	struct rest_job *job;
-	nng_http_req    *req = nng_http_conn_req(conn);
 	size_t           sz;
 	int              rv;
 	void            *data;
@@ -205,7 +204,7 @@ rest_handle(nng_http *conn, void *arg, nng_aio *aio)
 		return;
 	}
 
-	nng_http_req_get_data(req, &data, &sz);
+	nng_http_get_body(conn, &data, &sz);
 	job->http_aio = aio;
 
 	if ((rv = nng_msg_alloc(&job->msg, sz)) != 0) {