Why would my webservice method get called via GET?

Question

I have a asp.net 3.5 site with a *.asmx that serves several webservice methods. The only client that should be calling these methods is one I wrote, and it calls them using a POST request. However, my error logs show many InvalidOperationException errors due to these methods being called with a GET request.

Question: What might be causing these GET requests? Might proxies convert POST requests to GET requests without the client making the request knowing about it?

Answer 1

bots and crawlers?

Answer 2

It's always possible there is a bug in your client app. Why not get hold of an HTTP sniffer so you can see exactly what requests are being sent.

Answer 3

to expand on rusanu's answer, bots and crawlers and/or hackers?