Link communication method
    
flowchart LR
    A[Alice] --> H[HTTP Relay]
    H[HTTP Relay] --> B[Bob]
Link communication method provides HTTP client to HTTP client synchronous one-directional data transfers.
Link communication method implements producer -> consumer pattern.
A producer sends data using POST method, consumer requests using GET method.
The producer can transfer to the consumer request body and URL query parameters.
Communication Sequence Diagram
The producer is sending “My message” string to the consumer.
    
sequenceDiagram
    participant A as Producer
    participant H as HTTP Relay Server
    participant B as Consumer
    par Request
        A->>H: POST link/mychan
        Note left of H: Request body: "My message"         
    and
        B->>H: GET link/mychan
    end
	par Response
        H->>A: Response body: empty
    and
        H->>B: Response body: "My message"
	end	
par - block parts are parallel and can happen in any order.