Generally the protocol used to send a request from a client to the server is the HTTP. since its not so secure, can some one tell me which is the best protocol used send a request/response from client-server.

In finance based applications where the data is very sensitive and secure, is it secure to use the HTTP protocol?

Please help me...

Thanks.

No. Sensitve material should never travel over the HTTP pipe as it is all in plain text! If this is a web app, you need to use HTTPS which requires that your server have a security certificate installed (though you could also use OpenSSL for a free solution)

For an extremely more secure transfer, I would use a VPN tunnel, though that would defeat the purpose of having a web application as a person would be physciall connecting to another network.

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Thanks for the information.