What is the protocol should be used to consume RESTful Web Service?

REST services can be developed using HTTP protocol. REST is URI based and stateless.

We can use GET/POST/PUT/DELETE (CRUD operations) methods.

HTTP PROTOCOL with GET/POST method

We can work with HTTP  for rest web services

rest webservice use http protocol

We can work with HTTP or HTTPS and can add SSL while using HTTPS.

Rest web service works with only on 'HTTP' or 'HTTPS' protocol.

HTTP Protocol will be used to consume RESTful web services

you shuld use http or https and also soap protocol

You should HTTP or HTTPS protocols.

You should use HTTPS protocol for RESTful WEB Service. 

Service-oriented architecture (SOA) is a set of principles of systems design used in computing during the phases ofsystems development and integration. This system, which uses the structure and functions in the form of a package of offers services cooperative that can be used by different systems from multiple business areas.

The service infrastructure will allow users of services - such as Web applications - way to learn about SOA existing services, for example, may offer a range of separate departments within the company are a number of SOA services by more than a programming language, and benefit their customers of a clear and easy for these services interface. It uses language XML to communicate with the interface services SOA usually, but not necessarily.

SOA structure explains how the integration of Web applications to create a completely independent Web environment, using multiple software platforms. Know infrastructure and services in the form of interface functions and protocols, rather than defined as a front Application Programming API. Entrance called for the application of SOA end points endpoint.

Require service and there is free association between services, operating systems and any software technology used in other applications. Infrastructure jobs are divided into a set of autonomous units - or services, [1] - provided by programmers on the network so that users can re-use and integrate them to build applications. Users communicate with these services through trading data in a common and clear formulations or format a particular activity or more between the two services. [2]

Consideration could be given to service infrastructure in the context of a gradual evolution of the start of the first principles of computing Distributed [1] [3] Distributed Computing and programming of synthetic modular programming - through infrastructure service - right up to the current practices in applications blending mashups and applications ofSAS and cloud computing Cloud Computing (seen by some as an extension infrastructure services [4]).