Types of browser communications

Types of browser communications

Browser communication can occur between any host that supports a standard web browser and any NiagaraAX host.

Traffic is created by both the initial page download and by page updates that occur using HTTP and Fox protocol. The size of each page in a browser is dependent on the individual page content, whether you are using web workbench or the Hx browser view.

HTTP communication

HTTP protocol is used to download the workbench applet (wbapplet) and modules that are required for running workbench in the browser. Other HTTP traffic may be for graphics and widget downloads from various modules, as well as value updates when using Hx technology (non web workbench view). Each page and module download is cached so that they are a one-time traffic source, whereas the traffic involved with repetitive data value traffic is ongoing and dependent on the quantity and update frequency of information on a viewed page.

Fox communication

Fox protocol communication occurs in a browser context only when you are using workbench in the browser (wbapplet). This web workbench tool handles communication between the host and client using the Fox protocol and port 1911. If you are using the Hx (non-applet) view, then value updates in the browser are made using Hx technology, via HTTP, and not the Fox protocol.