Overview
TcpCatcher is a free TCP, SOCKS, HTTP and HTTPS proxy monitor server software.
As a developer tool, TcpCatcher will let you debug any client-server application
by displaying TCP packets.
As an educational tool, TcpCatcher will help understanding any TCP based protocol.
Since HTTP has became the most commonly used protocol, TcpCatcher provides a large tool box
for helping you debug any HTTP based conversation :
records all traffic between your browser and the Internet. HTTP packets, often chunked and zipped at network level, are reassembled, their content is deflated and
presented in a convenient way
html, javascript, css contents appears pretty printed and can be easily saved
XML payloads (like SOAP messages) are pretty printed, and loaded in a tree view
images captured at network level are displayed
HTTP headers definition pops up
monitors servers response time
Unlike any other tools, TcpCatcher has the great ability of letting you interfere in the communication at proxy level:
turn on 'Catch Mode' and debug step by step the client-server communication, each packet intercepted being friendly editable
provide your own java hook and apply a programmatic operation on each packets going through
 TcpCatcher can now let you monitor (and debug) an SSL communication ! Read more about this feature
Fully multithreaded and 100% java based, it is portable, fast and reliable and it has many useful extra features
like searching, sorting, filtering, dec/hex packet editor to help you analyze captured traffic.
Download latest release (v2.7.1), Firefox Add-On now and go to Tutorials section for sample fun use cases.
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