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There are two main types of transports as : blocking and non-blocking. In a blocking transport, the I/O threads get blocked since the same worker thread which that sends the request to the server will wait will remain open to receive the response, until received messages are processed completely until messages are completely processed by the underlying Axis2 engine. However However, in non-blocking transports the worker thread which that sends the request will not wait for the response and another thread will receive the response. Thereby, non-blocking transports increase the performance of the server. 

For more information on transports, see the following topics: