# Web Service Attributes Editor: Quality of Service: Transport

In the Transport section of the WSIT configuration editor, you can select optimal encoding or optimal transport for web service clients interoperating with web services.

Element | Description
--- | ---
Automatically Select Optimal Encoding (XML/Fast Infoset) | Fast Infoset is a more efficient alternative to XML. If the service is configured to allow Fast Infoset, select this option to use Fast Infoset for faster parsing, faster serializing, and smaller document sizes when compared with equivalent XML documents.
Automatically Select Optimal Transport (HTTP/TCP) | If selected, the client runtime checks to see if the service supports TCP, and, if so, the client uses TCP transport automatically for service-client communication. TCP provides better performance when sending smaller messages. The performance enhancement is visible mostly in smaller messages because the overhead of sending messages over the HTTP protocol is eliminated. If the service does not support TCP, or if this option is not selected for the client, HTTP is used for transport.
Endorsing | Specifies that the authentication token must be endorsed. With an endorsing supporting token, the key represented by the token is used to endorse/sign the primary message signature.

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