Like the well-known tee program on UNIX systems, HttpTea is sitting between the client and the server of a HTTP connection. It allows you to modify the requests and responses before submission. HTTPS traffic can be decrypted an displayed as well.
...It can detect memory leaks and buffer overruns (or underruns) in a malloc() / new memory buffer. DUMA is a fork of Bruce Perens' Electric Fence library.
sourceforge isn't maintained for many years!
suggest you want to look at https://github.com/johnsonjh/duma
...Simulate slow and unreliable networks. More powerful than Apache TCPMon and less expensive than Shunra Cloud. You can finally see what your SOAP service is sending over HTTPS!