| ## Develop consumer with Rest Template |
| RestTemplate is a RESTful API provided by the Spring framework. ServiceComb provides the implementation class for service calling |
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| ## Develop consumer with AsyncRestTemplate |
| AsyncRestTemplate allows users to make asynchronous service calls. The logic is similar to restTemplate, except that the service is called asynchronously. |
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| ## Develop consumer with transparent RPC |
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| The transparent RPC allows users to make service calls like a local call through a simple java interface. |
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| ## Using Contracts |
| When a consumer calls a service from a provider, the contract is required. The consumer can get the providers' contracts in 2 ways: get the providers' contract from off-line, then manually configure it in the project. Or, download the contract from the service center. |
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| ## Call Control |
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| ### Instance level fault isolation |
| The instance-level fault isolation feature introduces the ability to isolate failed service instances by stopping sending request to them. |
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| ### Fallback strategy |
| The fallback strategy allows user to specify the conditions under which the ServiceComb framework will terminate the requests. |
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| ### Rate limiting strategy |
| The user uses the rate limiting policy on the consumer side to control the frequency of requests sent to the specified microservice. |
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| ### Fault injection |
| The user uses fault injection on the consumer side to set the delay and error of the request sent to the specified microservice and its trigger probability. |
