Another simple HTTP proxy tool is Don s Proxy.
... unlike other similar tools,
DonsProxy provides the ability to see
HTTPS traffic in its unecrypted form
by acting as a terminus for the
client-side connection, and
establishing a new secured connection
with the target service. This is done
with full knowledge of the user, so
that it does not introduce a security
breach.
Sessions within DonsProxy are
instrumented with JMX, providing
visibility to the state of sessions
read buffers and some other
information.
While implemented in Java, this tool
can be used by developers building
networked applications in any
environment.