# Client API

JAX-RS 1.1 does not have a standard Client API. JAX-RS 2.0 will introduce a standard API. CXF JAX-RS offers an [HTTP-centric](http://cxf.apache.org/docs/jax-rs-client-api.html) and Proxy-based API.CXF will continue supporting and enhancing its private API for those developers who may want to continue using it even after CXF JAX-RS implements JAX-RS 2.0.

### In this section

* [HTTP Centric API](https://help.qlik.com/talend/en-US/esb-service-developer-guide/8.0/http-centric-api)
* [Proxy API](https://help.qlik.com/talend/en-US/esb-service-developer-guide/8.0/proxy-api)
* [Reading and Writing HTTP Messages](https://help.qlik.com/talend/en-US/esb-service-developer-guide/8.0/reading-and-writing-http-messages)
* [Handling exceptions](https://help.qlik.com/talend/en-US/esb-service-developer-guide/8.0/handling-exceptions)