The role of an adapter is to enable communications between BizTalk Server and external systems and trading partners. You can configure adapters by creating send ports and receive locations that define the properties for given instances of the adapter. Most adapters support both send and receive operations, whereas other adapters support communication in only one direction. But HTTP Adapter is one of the adapters that support two-way communications.
In this whitepaper, Sandro has described the step-by-step process of installing and configuring the HTTP Adapter in order to receive messages.
By reading this whitepaper, decision makers should have more information on the following areas: