msc=omegapple;
C: Client;
R1: Router;
R2: Router;
S: Server;

defstyle pipe [fill.color=rose];
defstyle pipe [fill.gradient=down];

pipe R1--R2: Tunnel [solid=0] {
    C->S: Request;
    C<-S: Response;
};
pipe R1--R2: Tunnel [solid=0.5] {
    C->S: Request;
    C<-S: Response;
};
pipe R1--R2: Tunnel [solid=1] {
    C->S: Request;
    C<-S: Response;
};
pipe R1--R2: Tunnel
     [solid=1, line.radius=10] {
    C->S: \plRequest;
    C<-S: \prResponse;
};
