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httpdbg is an HTTP proxy server which is single-threaded and prints every HTTP request and response to a log file as well as to stdout. It effectively single-threads your browser, which can help in debugging race conditions.
Enables a user to view & alter
all aspects of comunications with a web site via a proxy. Primarily used for security
based penetration testing of web sites, it can also be used for
debugging during development. Seen as part of a hacker toolkit.