I am sending files to a web service in a vs2005 app using, of course, WSE 3.0. The only way I knew to prove to myself that it was really going up their using MTOM was to use Simon Fell’s TCP Trace program that I wrote about in this past post.

Here is with the MTOM “Client On” setting. Note the MIMEBoundary data and xop. That’s how the binary data gets sent with MTOM.

and here it is with the check mark off in the wse 3.0 settings. Note the lack of the MIMEBoundary info. If you saw the entire, contents of this, you would see the streamed data included – the array of base 64 bytes.

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